04 Tahoe engine replacement, L33 or LQ4?

[Tonyrodz]

It will bolt up, but GM found it necessary to upgrade the standard 4L60 and call it a 4L65 which is what you find in Denali Yukons and Escalades. The 4L60 & 4L65 are built from the same transmission case. I believe it to be a 5 gear planetary gear in the 65 vs. a 4 gear planetary in the 4L60. If/when dropping a 6.0 into a vehicle it didn't come in, I would see the value in upgrading your trans to a 4L65.

Blew my 4l60 the first time racing......I mean, passing an Acura. He wasn't expecting that!