VEHICLES, CAMPERS, and BOATS > Powerplant, Driveline, and Braking

4L60E transmission issue

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HuskerTrev:
Hey Guys,

  So the head 5.3 on the Adventure Hoe cracked like every 5.3 of that vintage does, adding a liberal amount of coolant to the engine oil. I would have liked to source a 4bt but time was against me as this is my daily driver as well and I needed a fix ASAP. I was able to source a low mile 6.0L from a 2500hd of the same era. Engine swap went just fine. She fired up on the second crank and runs great considering the ECM still thinks it is a 5.3. Drove it around town for about 30 minutes Sunday night. All smiles from me, then Monday morning, she fired right up, backed out of my parking spot and headed to work. Didn't make out of the parking lot. Literally went less than a block and the tranny started slipping like crazy. Was able to limp back to my parking spot at a gentle 3500 rpm. Thought, well, low on trans fluid. Was showing slightly high. Thinking I may have a pump issue.
Took the advice of one of the tranny guys at work and dropped the pan to make sure the filter hadn't fallen out or cracked during the engine change. No such luck. Changed the filter anyway and filled the tranny back up. Seemed to suck the fluid down this time and wound up adding around six quarts (even though the manual said 5 quarts needed for pan r&i). Still no go.
I am so frustrated with this thing right now I can't think. Any ideas as to other probable causes? Things like this are what are keeping me from updating my build thread!
Thanks in advance !
Trev

TexasRedNeck:
Do you have reverse?


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TexasRedNeck:
I had a similar issue with my allison.  One of the solenoids were bad and I ended up also needing a manifold pressure switch.

If you don't have access to a scanner, I'd pull the pan and each solenoid and measure the resistance on the coils.  You may find one that is bad.

KensAuto:
and check the trans electrical plug for fluid. Unplug it, and it should be spotless.
Pulling the motor also could have disturbed the harness.

HuskerTrev:
No reverse. No manual 3 2 1 either. I would think that even if there was an electrical issue, I would still be able to get the vehicle into gear, just not have auto shift due to the electronic valve body.

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