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Offline JR

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #200 on: February 17, 2020, 01:50:15 PM »
Interesting for sure, will it work as well as air though?

2nd gen 3500 gm platform?
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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #201 on: February 17, 2020, 08:35:53 PM »
why water to air? limited space in the ‘73-‘80 core support? i’ve heard they’re smaller burb ever seen one first had to know for sure. where will the reservoir be? does it continuously flow?
You're as bad as my.....
Well I suppose I've missed some of your thread also
Check out post #140-142.
I have 2 surge tanks ordered. One for the rad, and 1 for the cooler since I can't get to the cap for filling.

For now the electric water pump will run all the time, until I hook up a temp sensor somewhere.

JR, yes they work really well. Since I'm not going to tow long grades it should be fine... just less reliable I would think. ... electric water pump, extra hoses, extra radiator, etc.
This whole engine/trans setup is a 96 Dodge 3500, according to the P-pump numbers.

Thanks Don!
« Last Edit: February 17, 2020, 08:37:09 PM by KensAuto »
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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #202 on: February 18, 2020, 08:20:44 PM »
Got the brake lines back in, cooling system together, made the f *#"&"&! Dodge fan shroud fit, made an intake horn , installed a bleeder in the highest point of the cooler box, and let it run for a while. So far so good.

Next up is the air cleaner and plumbing the coolant hoses for the intercooler.
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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #203 on: February 19, 2020, 06:06:08 PM »
...and prepped the trans for installation.
I forgot that the tailhousing had to be modified for the transfer case adapter, so that was the next purchase.

This is the kit from Advance Adapters.
The tailhousing has to be notched for the t/c shift shaft...
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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #204 on: February 19, 2020, 06:07:40 PM »
....then 2 new holes drilled for the adapter. Once that was accomplished, it was sprayed with beige.
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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #205 on: February 19, 2020, 06:13:34 PM »
While I had the paint flowing I went ahead and shot the new GLO rear diff cover. I mean, I felt the need to cover up Shawn's hideous welds before anyone saw them.

(Just kidding for those that don't know how we joke around here)
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Offline JR

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #206 on: February 19, 2020, 06:18:17 PM »
Looking good
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Offline swbhobie16

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #207 on: February 19, 2020, 09:19:43 PM »
....then 2 new holes drilled for the adapter. Once that was accomplished, it was sprayed with beige.

we said no beige!! it’s only 50% likely to run now!! hahah

but.. i gotta admit. does look good.

Offline JR

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #208 on: February 19, 2020, 10:08:12 PM »
What do I do with my 12 cans?
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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #209 on: February 19, 2020, 10:49:24 PM »
Come on Seth, you painted one that color...2 tone iirc.
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Offline TexasRedNeck

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #210 on: February 20, 2020, 05:53:48 AM »
Good stuff Ken.


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Offline swbhobie16

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #211 on: February 20, 2020, 06:05:36 AM »
Come on Seth, you painted one that color...2 tone iirc.
Pepperidge Farms remembers.

i really do dig the color.

this whole build just oozes cool. clean. simple. to the point.

going to be one slick 1 ton when you get the 60 cleaned up and gone through. as it should have been from the factory. (while i liked my 1st gen cummins.. the square body chevy just looked better all the way around..)

Offline Flyin6

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #212 on: February 20, 2020, 08:46:42 AM »
Really nice work!
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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #213 on: February 21, 2020, 09:55:57 PM »
So I went with this clutch. Not the perfect choice but will work, for the price. ..13" upgrade, but still fits the smaller 1.25" input shaft.
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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #214 on: February 21, 2020, 10:04:18 PM »
Before the trans went in I took off my shoes to measure how much I needed to cut out of the transmission tunnel. Also had to modify the t/c shifter to clear my bench seat, and the new bracket that it mounts to. Dang crossover years. Pretty sure GM used a shifter from the previous ''69-72 models in the '73/74 trucks.
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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #215 on: February 21, 2020, 10:14:42 PM »
That ^^^ was real fun trying to figure out without mounting the transfer case for measurements.

..and the trans is installed.
I used a 91 Chevy slave as opposed to staying with mid 80s, like the master, because the bolt pattern is wide enough to redrill to fit the nv4500 studs.
Only issue is it won't allow the bleeder to face upwards. I'll have to remove it to bleed but don't mind.

The preferred way would be to make an adapter for the earlier GM model like American Mike posted earlier, for the smaller bolt pattern, but this is the new me... time to wrap this up.

.. Dodge on the top. 91 Chevy on the rest, after drilling new holes.
Now I can order the correct length -3an hose...in this case 48".
« Last Edit: February 22, 2020, 12:45:13 AM by KensAuto »
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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #216 on: February 21, 2020, 10:26:39 PM »
I need to sort out the transfer case and get it mounted before building a crossmember. As mentioned earlier, the old male 10 spline 205 needs to be converted to a female 29 spline.
To do this, it has to be completely disassembled and the input bearing bore machined out to 3.543", from about 3.150".

Today the Halloween themed 205 was taken apart in a careless fashion, with zero regard for the bearings, nuts, and my favorite hammer.
That took less time than it took to clear the workbench to make way for this cluster....
« Last Edit: February 21, 2020, 10:28:13 PM by KensAuto »
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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #217 on: February 21, 2020, 10:30:43 PM »
I did not trust myself to machine something of this importance.....
... so I went ahead and did it anyway.

This is were it stands at the moment.
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Offline stlaser

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #218 on: February 21, 2020, 10:42:17 PM »
Boy that transfer case I bought was much cleaner than the one you kept.....  :tongue:


And it’s just a boring bar, easy peasy  :likebutton:
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Offline America.Mike

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #219 on: February 21, 2020, 11:11:30 PM »
This truck is turning out badass!


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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #220 on: February 22, 2020, 12:41:28 AM »
Boy that transfer case I bought was much cleaner than the one you kept.....  :tongue:


And it’s just a boring bar, easy peasy  :likebutton:
Yeah, but you forget who's doing the boring!
Oh, and you only got 1 out of the 2 Ford t/cs. I'll be robbing parts tomorrow. Got a couple rusted gears.

Thanks Mike.
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Offline swbhobie16

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #221 on: February 22, 2020, 01:30:38 PM »
i saw the 10 spline input and was going to ask if you were just adapting it or going to bore and put 29 spline in. it sure is turning out nice. wish i had a milling machine i have to run my stuff down to a machine shop buddy. but it’s always cool to see what he has going on down there too. sounds like it shouldn’t be too much longer before you’re motoring down the road in a newly swapped K truck. exciting times for sure!

Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #222 on: February 22, 2020, 03:36:16 PM »
The reason I have a mill is because I can't trust anyone around here. Just need to spend more time using it, and learning to clean up after myself. Lol

Today I finished the bore and tore down a spare ford left hand drop 205 I got from the same owner of the 12v engines. It looks like it only had a few thousand miles on it when someone rebuilt it. I'll be using the gears and possibly bearings from it (USA timkens) instead of the new ones in the rebuild kit I purchased.

My gears are pretty rust/pitted.
« Last Edit: February 22, 2020, 03:37:49 PM by KensAuto »
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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #223 on: February 22, 2020, 03:44:06 PM »
The ford 205...

I absolutely hated the front pinion on my tc. It was very difficult to remove the front driveline/CV joint because of bolt location.
The ford tc has a longer pinion ... better bolt access... so that should be an improvement.

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Offline swbhobie16

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #224 on: February 22, 2020, 09:08:38 PM »
that’s awesome. and aggravating. how much of the ford case are you using? just front and rear output? getting a new 29 spline input i take it.

Offline swbhobie16

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #225 on: February 22, 2020, 09:14:05 PM »
i think the chevy and dodge case that i’ve gotten in to lately both had threads in the yoke and not pass through holes like yours. so that must be a year thing.

Offline JR

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #226 on: February 22, 2020, 09:30:49 PM »
Think Shawn has some nice caps for those. Plus I think you can just drill em out for U bolts.
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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #227 on: February 22, 2020, 10:01:08 PM »
that’s awesome. and aggravating. how much of the ford case are you using? just front and rear output? getting a new 29 spline input i take it.
Everything except the case, speedometer drive (plastic...mine's metal) and input.. that came in the adapter kit.... that I had to bore the case for.
JR, I'm running a CV in the front driveline. It has threaded caps. If I have to replace it I'll go to a ubolt setup, or maybe a flange style.

The 29 spline input is still wrapped up in this pic.
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Offline swbhobie16

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #228 on: February 22, 2020, 10:29:47 PM »
that’s awesome. and aggravating. how much of the ford case are you using? just front and rear output? getting a new 29 spline input i take it.
Everything except the case, speedometer drive (plastic...mine's metal) and input.. that came in the adapter kit.... that I had to bore the case for.
JR, I'm running a CV in the front driveline. It has threaded caps. If I have to replace it I'll go to a ubolt setup, or maybe a flange style.

The 29 spline input is still wrapped up in this pic.

very nice.

are the drive gears the same? (same groove count) that’s definitely something to consider as well as for tuning the speedo.

Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #229 on: February 24, 2020, 09:07:07 PM »
So, the front output shaft on the Ford tc is much stouter, so I'll use that whole assembly. The rear output shaft is very similar, except for having a plastic speedometer gear. I went to swap it for my steel gear and the ford shaft is larger diameter, just where the speedo mounts. The rear housing is also different, so I had to clean my old one .

The '73 205 was cleaned, painted, and I sprayed some red oxide on the inside.
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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #230 on: February 25, 2020, 11:43:48 AM »
Difference in the rear housings. First pic is driver's drop ford (left) compared to the right side drop. Speedometer driven gear rides high. My chebby rides low. Because of this the internal drive gears have opposite teeth direction.

More useless info to absorb Don's monthly pixie allotment.
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Offline swbhobie16

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #231 on: February 25, 2020, 12:57:33 PM »
can’t you just flip the gear over..?








 :grin:

good to know for future reference

Offline JR

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #232 on: February 25, 2020, 02:37:56 PM »
can’t you just flip the gear over..?








 :grin:

good to know for future reference

Still spins the same way,,,,,,,,
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Offline stlaser

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #233 on: February 25, 2020, 05:52:08 PM »
In Ken’s case that would always be left
Living in the remote north hoping Ken doesn’t bring H up here any time soon…..

Offline swbhobie16

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #234 on: February 25, 2020, 07:23:05 PM »
can’t you just flip the gear over..?





‘twas a joke. i laughed to myself picturing everyone turning it over in their head and saying ‘it still spins the same way!’




 :grin:

good to know for future reference

Still spins the same way,,,,,,,,

Offline JR

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #235 on: February 25, 2020, 07:23:26 PM »
Had to bring H into it?
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Offline stlaser

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #236 on: February 25, 2020, 07:47:34 PM »
Had to bring H into it?

Absolutely, it’s been awhile plus I owed him for some detuned 24v comment
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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #237 on: February 26, 2020, 10:14:25 PM »
Finished the tcase.
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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #238 on: February 26, 2020, 10:24:30 PM »
I hate to bad-mouth a company, but I will. The instructions that came with the adapter kit were terrible. I downloaded the full version from their site and that was also terrible.
I had to download the version for a GM 4500 trans just to get a pic of how the tailhousing was supposed to look after cutting out the notch for the tc shift rail.
The box of parts included a piece of square tubing that has 4 holes that matches the pattern of the transmission mount, but no pics, nor explanation. It's about 1.5"... why would anyone want to raise the trans another 1.5"? My tc is already hanging way too low. More on that later.
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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #239 on: February 26, 2020, 10:27:28 PM »
Oh, and got the -3an hose ran to the slave. Man what a difference... pedal feels like butter, especially compared to the old mechanical setup!
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Offline stlaser

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #240 on: February 26, 2020, 10:27:48 PM »
As someone who manufactures clocking rings and np205 ones at that it’s for mall crawlers.......


It looks good though!  :likebutton:
« Last Edit: February 26, 2020, 10:28:45 PM by stlaser »
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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #241 on: February 26, 2020, 10:32:11 PM »
Then installed a GM air cleaner.
Some 4" stainless exhaust scuffed up on the belt sander, a couple couplers, and a LS style air box . Drilled a couple holes in the inner fender for it to snap into, and almost done.
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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #242 on: February 26, 2020, 10:33:35 PM »
As someone who manufactures clocking rings and np205 ones at that it’s for mall crawlers.......


It looks good though!  :likebutton:
What you saying?

If it's bad why wait for me to install it knucklehead!!
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Offline stlaser

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #243 on: February 26, 2020, 11:34:02 PM »
As someone who manufactures clocking rings and np205 ones at that it’s for mall crawlers.......


It looks good though!  :likebutton:
What you saying?

If it's bad why wait for me to install it knucklehead!!

Sorry, no comprende this must be some backwards liberal logic.
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Offline JR

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #244 on: February 27, 2020, 01:16:54 AM »
The air cleaner look great. I need one for the SUB and have the 5.3 in the shed stored, will have to look at it.

Does it flow enough air?
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Offline TexasRedNeck

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12v Cummins Swap/'73 GMC 2500
« Reply #245 on: February 27, 2020, 09:03:48 AM »
Just a rudimentary volume calculation would say yes. 5.3l x 5000 rpm = 26,500l.

5.9l x 3000 rpm = 17,700


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« Last Edit: February 27, 2020, 09:04:50 AM by TexasRedNeck »
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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #246 on: February 27, 2020, 11:00:34 AM »
Just a rudimentary volume calculation would say yes. 5.3l x 5000 rpm = 26,500l.

5.9l x 3000 rpm = 17,700


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Thanks brainiac...
I went with the less precise redneck method. I ordered a Wix for a 6.0, the thick "H/D" one for a 5.3, with a wire mesh backing to keep it out of the turbo :), compared the size to my LML, and moved forward. I still need to trim off the inlets because they don't match up to the fender openings....and not going to cut the fender.
...and Shawn still didn't answer my question I see.
Is it because the plate is aluminum that makes it less than desirable? I have to use something to adapt the figure 8 style and retain the input bearing. Only stronger option I could see is to use the actual Dodge 205 so no adapter would be needed...?...
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Offline TexasRedNeck

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #247 on: February 27, 2020, 12:08:42 PM »
You’re welcome redneck


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Offline KensAuto

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #248 on: February 27, 2020, 02:39:00 PM »
You’re welcome redneck


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I didn't mention the flaw in your math.
It has to do with forced induction.

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Offline Farmer Jon

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Re: 12v Cummins Swap/'73 GMC 2500
« Reply #249 on: February 27, 2020, 03:01:19 PM »
Nice touch with the air cleaner.

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