Sticking with the 4L60e, there is no reason to swap them. The right transmission shop can make them last. I got the harness from Jamie Groeneweg. He has done them for a few people in this group.
Read that so many times, the same people would update later on that they rebuilt the trans.
IMHO, 5000 lbs, 400+ hp and 35s are too much for that trans to handle. But if you have 4.56 gearing there is a chance
I went with PATC out of Bossier City, LA for my 700R4 trans upgrade that was married to a 383 stroker. It performed flawlessly. I’ll be going to them again to upgrade the 4l60 when I do my swap. Check out their website and/or give them a call. See what advice they can give you.
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