A GM 4L80E technically is the electronically ... bolt-in accessory that did not require any modification for our project. The transmission mount is the same as a Turbo 400’s, but it requires ...

Also, the 4L80E transmission is typically about 4 inches longer than a TH400 (depending on the length of the extension housing), but the trans mount is located roughly 112 inches rearward.

Thankfully Mike and RPM Transmissions came up with an alternative solution-retrofitting the baddest electronically controlled transmission GM ever made: the 4L80E ... out how to mount the ...