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Transmission will not engage after engine swap

Tiny
MALHAVOK
  • MEMBER
  • 2005 GMC SIERRA
  • 4.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Switch the engine from a 1998 4 wheel drive Jimmy into my truck which is listed above both vehicles had a 4.3 V6. I did this because it had a blown engine. The engine works fine just cannot get the transmission to engage. I have checked all the fluid levels there good, transmission linkage works, properly. The parts we changed. Knock sensor oil filter adapter and I believe that is it. I do not know if we need to change the PCM or what we need to change to be honest that is the question why will the thing not engage?
Thanks for your help!
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Sunday, June 18th, 2017 AT 10:11 AM

7 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Hello,

Lets run the codes to see if there is any problems the computer can see first.

Here is a guide to help you get going.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run this test and get back to us so we can continue helping you.

Cheers, Ken
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Wednesday, June 21st, 2017 AT 11:21 AM
Tiny
MALHAVOK
  • MEMBER
  • 4 POSTS
I forgot to mention that we used the torque converter from the Jimmy also. My buddy has been doing most of the work and he said that the one from the Sierra caused engine to stick out about an inch. I can't run codes right now. We've dropped tranny to pull the. I was going to haul them both somewhere and pick someone's brain to get this thing running.
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Thursday, June 22nd, 2017 AT 3:30 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Please let us know what happens, we are interested to see what it is.

Cheers, Ken
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Thursday, June 22nd, 2017 AT 10:29 AM
Tiny
MALHAVOK
  • MEMBER
  • 4 POSTS
Haven't had the chance to take it in yet. Would you happen to know the difference between the 2 TC? I know that the different splines and impeller angles etc create differebnt pressures I just don't understand why the same transmission would have two different torque converters.
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Saturday, June 24th, 2017 AT 7:14 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
V8 and V6 torque converters are different due to the power and torque outputs.
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Saturday, June 24th, 2017 AT 10:42 AM
Tiny
MALHAVOK
  • MEMBER
  • 4 POSTS
THEY ARE BOTH 4.3 V6
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Saturday, June 24th, 2017 AT 11:01 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
How are the converters different? Can you upload a picture so I can see?
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Monday, June 26th, 2017 AT 9:12 AM

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