All Tahoes and any GM truck with a 5.3 or 4.8 had the 4L60. The 65 only came in higher output horsepower applications by GM. So trucks with the 65 would be the SSS, any vortex max, H2, Denali, TBSS and Escalade..... since the Gibbs were modified by 3rd party it just had a regular old 60.
There ya go. Thanks for the info.
^^ Agreed. I didn't want to hurt any feelings but I kinda wondered about that thing hanging out back there like an afterthought.