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Offline dave945

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1986 K5 Blazer
« on: October 16, 2018, 10:45:24 PM »
So I had to drive the blazer for a week or so while the Honda Odyssey was down waiting for radiator and fan replacement. It highlighted some issues that need to be resolved. Just for some background, it?s got a 5 liter v8 with a 700R4 transmission and NP208 transfer case, and sits on 3/4 ton axles front and rear. Here are the issues I noticed over the couple days I drove into the office 60 miles each way.
1)  engine was boiling the coolant out and onto the overflow. Think I may have a stuck thermostat.
2). Transmission is leaking some and not shifting very cleanly/consistently. This tranny was rebuilt maybe five years ago, I?m doubting the quality of the rebuild.
3). Vibration/groaning on letting off the gas pedal at higher speeds. Seems like it might be coming from the driveshaft area, but not sure yet.
4). Steering is loose/has a lot of play in it.
5). Brakes tend to be a little touchy, I?m guessing it has to do with the large drums in the rear on the   14 bolt FF axle.

My goal is to get the truck into a condition where daily driving is possible and even comfortable. Optimally, it would be solid enough for my wife to be comfortable driving it. We?ll see how it goes.

I don?t have any set plans at this point and I?m open to ideas and suggestions.  I?ll try to keep this updated as work gets done.




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Offline stlaser

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Re: 1986 K5 Blazer
« Reply #1 on: October 16, 2018, 11:22:18 PM »
3) u-joint or u-joints

5) I have a disc conversion kit for that axle, regardless a $40 Wilwood adjustable proportioning valve might help

« Last Edit: October 16, 2018, 11:25:49 PM by stlaser »
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Offline Bigdave_185

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Re: 1986 K5 Blazer
« Reply #2 on: October 17, 2018, 01:18:06 AM »
Start with a oil change. End with a parking lot land mark


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Offline dave945

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Re: 1986 K5 Blazer
« Reply #3 on: October 17, 2018, 07:20:06 AM »
Start with a oil change. End with a parking lot land mark


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Oil change.....so you?re saying I should do a duramax conversion with Allison transmission and put portal axles in?  I?ll have to consider it. At least I know where a diesel shop is, there?s a big green landmark already there.


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Offline dave945

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1986 K5 Blazer
« Reply #4 on: October 17, 2018, 07:21:10 AM »
3) u-joint or u-joints

5) I have a disc conversion kit for that axle, regardless a $40 Wilwood adjustable proportioning valve might help
I?ll check the u joints on the driveshaft. I need to check my angles too, something i keep telling myself to do. 

How much is the disc conversion kit?  I?ve considered doing that before just to shave 100 pounds off the rear axle.


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« Last Edit: October 17, 2018, 07:22:03 AM by dave945 »

Offline stlaser

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Re: 1986 K5 Blazer
« Reply #5 on: October 17, 2018, 07:26:53 AM »
Bracket kit & mounting hardware $50, then depending on auto parts another couple hundy but I provide all part numbers and you can source from rock auto or whomever etc.
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Offline dave945

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Re: 1986 K5 Blazer
« Reply #6 on: October 17, 2018, 09:03:08 AM »
Sounds good. I?m going to start busting knuckles on it this week and see if there is anything else I need that before I order, you never know what might come out of this project.


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Offline KensAuto

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Re: 1986 K5 Blazer
« Reply #7 on: October 17, 2018, 09:33:13 AM »
Agree with Shawn, probably ujoints or slip yoke...or you left the hubs locked in the last time you went wheelin'..
Trans issue could be the TV cable adjustment. It's different than a "kickdown" cable and has to be adjusted just right or it will shift funky.
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Offline EL TATE

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Re: 1986 K5 Blazer
« Reply #8 on: October 17, 2018, 10:34:07 AM »
Also could be pinion bearings :cry: Get the rear axle up on jackstands and have the wife accelerate then let off the gas and listen near the pinion support. Deceleration noise is typically loss of preload and bearings buzzing while the pinion gear runs in an "off" spot on the ring gear coast side.
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Offline KensAuto

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Re: 1986 K5 Blazer
« Reply #9 on: October 17, 2018, 11:21:23 AM »
Also could be pinion bearings :cry: Get the rear axle up on jackstands and have the wife accelerate then let off the gas and listen near the pinion support. Deceleration noise is typically loss of preload and bearings buzzing while the pinion gear runs in an "off" spot on the ring gear coast side.

Jeez, that escalated quickly. lol
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Offline stlaser

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Re: 1986 K5 Blazer
« Reply #10 on: October 17, 2018, 11:39:27 AM »
You know those differential sales guys..... :popcorn:
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Offline Nate

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Re: 1986 K5 Blazer
« Reply #11 on: October 17, 2018, 11:55:50 AM »
Also could be pinion bearings :cry: Get the rear axle up on jackstands and have the wife accelerate then let off the gas and listen near the pinion support. Deceleration noise is typically loss of preload and bearings buzzing while the pinion gear runs in an "off" spot on the ring gear coast side.

Am i the only one that finds that method a bit odd....?

- put rear axle on jack stands

- stick entire body under said vehicle

- have WIFE put it in drive (and hope its not reverse)

- smash gas pedal (pray shes not pissed at you or been watching too many murder tv shows)

- then listen for noise with head next to axle

?
« Last Edit: October 17, 2018, 11:58:01 AM by Nate »
Nate

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Offline Flyin6

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Re: 1986 K5 Blazer
« Reply #12 on: October 17, 2018, 11:58:23 AM »
Could also be the magnetic resonance transverse wave focusing on the variometric spinning bearing in a sheroid, elliptically modified orbit,

Or what they said...
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Offline Flyin6

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Re: 1986 K5 Blazer
« Reply #13 on: October 17, 2018, 11:59:28 AM »
Also could be pinion bearings :cry: Get the rear axle up on jackstands and have the wife accelerate then let off the gas and listen near the pinion support. Deceleration noise is typically loss of preload and bearings buzzing while the pinion gear runs in an "off" spot on the ring gear coast side.

Am i the only one that finds that method a bit odd....?

- put rear axle on jack stands

- stick entire body under said vehicle

- have WIFE put it in drive (and hope its not reverse)

- smash gas pedal (pray shes not pissed at you or been watching too many murder tv shows)

- then listen for noise with head next to axle

?
What's wrong with any of that?

I don't get it

Makes sense to me

Derrrr....

;-)
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Offline dave945

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1986 K5 Blazer
« Reply #14 on: October 17, 2018, 12:15:55 PM »
Also could be pinion bearings :cry: Get the rear axle up on jackstands and have the wife accelerate then let off the gas and listen near the pinion support. Deceleration noise is typically loss of preload and bearings buzzing while the pinion gear runs in an "off" spot on the ring gear coast side.
Should it be in 4 wheel drive when she punches it?  That would help with Nate?s concerns above.



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Offline EL TATE

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Re: 1986 K5 Blazer
« Reply #15 on: October 17, 2018, 12:18:33 PM »
Also could be pinion bearings :cry: Get the rear axle up on jackstands and have the wife accelerate then let off the gas and listen near the pinion support. Deceleration noise is typically loss of preload and bearings buzzing while the pinion gear runs in an "off" spot on the ring gear coast side.

Am i the only one that finds that method a bit odd....?

- put rear axle on jack stands

- stick entire body under said vehicle

- have WIFE put it in drive (and hope its not reverse)

- smash gas pedal (pray shes not pissed at you or been watching too many murder tv shows)

- then listen for noise with head next to axle

?

Only strange to those with Ex's I suppose :shocked:
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Offline EL TATE

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Re: 1986 K5 Blazer
« Reply #16 on: October 17, 2018, 12:19:59 PM »
You know those differential sales guys..... :popcorn:

Just for that, I'll be sponsoring Dave's rebuild when he finds the bad bearings.   :tongue:

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Offline Flyin6

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Re: 1986 K5 Blazer
« Reply #17 on: October 17, 2018, 12:37:44 PM »
OK, you have that.

I'll handle the prayer request thread for Dave's recovery!
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Offline stlaser

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Re: 1986 K5 Blazer
« Reply #18 on: October 17, 2018, 12:52:17 PM »
You know those differential sales guys..... :popcorn:

Just for that, I'll be sponsoring Dave's rebuild when he finds the bad bearings.   :tongue:

I just read free u-joints! Sweet
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Offline dave945

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Re: 1986 K5 Blazer
« Reply #19 on: October 17, 2018, 02:06:13 PM »
You know those differential sales guys..... :popcorn:

Just for that, I'll be sponsoring Dave's rebuild when he finds the bad bearings.   :tongue:

I just read free u-joints! Sweet
I think you misread, he said he would sponsor the rebuild, he didn?t put any limitations on it. This is gonna be a sweet ride.  So would a ball peen hammer or a five pound sledge be the best way to ?discreetly? cause bad bearings?


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Offline stlaser

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Re: 1986 K5 Blazer
« Reply #20 on: October 17, 2018, 02:10:45 PM »
Well, I read FULL sponsorship too!
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Offline EL TATE

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Re: 1986 K5 Blazer
« Reply #21 on: October 17, 2018, 02:11:25 PM »
Just get the lube serviced by Jiffy Lube. They'll put in waste oil and the rest will be history
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Offline stlaser

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Re: 1986 K5 Blazer
« Reply #22 on: October 17, 2018, 02:47:39 PM »
Yeah, what?s the update on that anyhow?
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Offline Bigdave_185

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Re: 1986 K5 Blazer
« Reply #23 on: October 18, 2018, 12:29:19 AM »
Get that Alison trans ordered yet?


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Offline Farmer Jon

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Re: 1986 K5 Blazer
« Reply #24 on: October 18, 2018, 07:02:37 AM »
Also could be pinion bearings :cry: Get the rear axle up on jackstands and have the wife accelerate then let off the gas and listen near the pinion support. Deceleration noise is typically loss of preload and bearings buzzing while the pinion gear runs in an "off" spot on the ring gear coast side.

Am i the only one that finds that method a bit odd....?

- put rear axle on jack stands

- stick entire body under said vehicle

- have WIFE put it in drive (and hope its not reverse)

- smash gas pedal (pray shes not pissed at you or been watching too many murder tv shows)

- then listen for noise with head next to axle

?


Thats how I found the vibration on my pickup.
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Offline EL TATE

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Re: 1986 K5 Blazer
« Reply #25 on: October 18, 2018, 01:07:16 PM »
Thank you Jon, now I feel validated :cool:
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