Need advice
Thread Starter
Teching In
Joined: Aug 2014
Posts: 25
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From: Winninpeg Mb.
Need advice Awhile back I posted I was willing to swap my T56 over to an 4L60E so that the wife could drive the car.
I found a local guy who has a freshly rebuild auto willing to make the swap. Is there anything I need in the way of PCM tunning after the swap is done?
I have found lots of info using the search but it all was about swaping an auto for T56 and not much I could find on doing the reverse.
Thanks in advance for any help anyone can offer.
I found a local guy who has a freshly rebuild auto willing to make the swap. Is there anything I need in the way of PCM tunning after the swap is done?
I have found lots of info using the search but it all was about swaping an auto for T56 and not much I could find on doing the reverse.
Thanks in advance for any help anyone can offer.
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
You will also need to get an add-on harness for the 4L60E. IIRC Speartech and perhaps other vendors sell them for around $200. It should include directions on how to pin it into your PCM connectors; you then run it back to the trans.
Its a big project to swap from a T56 to an auto, and even a bigger one to go the other way. I half way seriously suggest swapping cars with someone who has a 4L60E and now wants a T56.
Its a big project to swap from a T56 to an auto, and even a bigger one to go the other way. I half way seriously suggest swapping cars with someone who has a 4L60E and now wants a T56.
Thread Starter
Teching In
Joined: Aug 2014
Posts: 25
Likes: 0
From: Winninpeg Mb.
You will also need to get an add-on harness for the 4L60E. IIRC Speartech and perhaps other vendors sell them for around $200. It should include directions on how to pin it into your PCM connectors; you then run it back to the trans.
Its a big project to swap from a T56 to an auto, and even a bigger one to go the other way. I half way seriously suggest swapping cars with someone who has a 4L60E and now wants a T56.
Its a big project to swap from a T56 to an auto, and even a bigger one to go the other way. I half way seriously suggest swapping cars with someone who has a 4L60E and now wants a T56.
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
Understand that you don't want to swap cars.
I don't know if the trans swap would affect value; depends upon the buyers.
I didn't really want to completely discourage you, just have you realistically understand the complexities and costs.
I certainly would not swap; even my wife likes to drive a manual.
I don't know if the trans swap would affect value; depends upon the buyers.
I didn't really want to completely discourage you, just have you realistically understand the complexities and costs.
I certainly would not swap; even my wife likes to drive a manual.
TECH Junkie
Joined: May 2012
Posts: 3,048
Likes: 714
From: Poplarville, MS
I did the swap it’s not that bad. I had a donor car so I had the wiring harness, PCM, shifter, pedal assm and all of the small pieces that you don’t think of until you need them. I also cut the trans tunnel out of the donor and welded it in over top of the shifter hold left by the t56. By doing this the shifter bolted up as if stock. You will also need to hook up the neutral/back-up light switch for the PCM to control idle. If you have to buy all of the parts it can be a big undertaking. If you decide to go ahead with the swap I have wiring diagrams for the neutral/back-up light switch and pedals so all the safety features, cruise control and torque converter tcc will work. This project is not for the faint of heart but is doable.
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
First Mr Bond says "it's not that bad" and then says he had an entire donor car. Yikes, that makes it sound rather scary.
Anyway, another thread just started about swapping from a T56 to a 4L80E. While the trans is different, much of it would apply to you too and a swap to a 4L60E is a bit easier:
https://ls1tech.com/forums/automatic...80e-build.html
Good luck, either way you go.
Anyway, another thread just started about swapping from a T56 to a 4L80E. While the trans is different, much of it would apply to you too and a swap to a 4L60E is a bit easier:
https://ls1tech.com/forums/automatic...80e-build.html
Good luck, either way you go.
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TECH Junkie
Joined: May 2012
Posts: 3,048
Likes: 714
From: Poplarville, MS
The donor car was my Camaro that was totaled, so I didn’t just go out and buy one, it was the reason for the swap. The Camaro had my modded engine, trans and two week old Yank torque converter that I swapped into my current car that had a t56 when I bought it. A donor car is not necessary but it sure made it a lot easier. Note going from a t56 to 4L60E you will not have to change the length of your drive shaft.
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