Weedo Posted March 21, 2005 Report Share Posted March 21, 2005 I'm at the point where I need a new Trans. The 4L65 just isn't holding up to an extra 200awhp and 225awtq at the wheels. The trans is slipping BAD going from the 1-2 shift. Starts to shift at about 40mph and doesn't actually get into 2nd until about 60mph or so. It seems even the built 4L65's aren't standing a chance with a lot of power. I also read out here that no one has done the 4L80 swap in their SS? Since I have a Yukon Denali with AWD, is the setup the same? I know the SS has a longer wheelbase, thus some different parts. Does anyone know the possibilities of putting in a 4L80 into a Yukon Denali? Or is this uncharted territory? Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.