We are in the process of replacing a 6.2 / 3L80 with a 6.5TD / 4L80, and there are many modifications that are required. This post is solely about driveshaft lengths. Measurements are from center-of-cup to center-of-cup.
Rear Drive Line: 25 1/4 in.
Front Intermediate Drive Line: 32 7/8 in.
Due to unforeseen issues, we have been unable to update this site since May, 2019. There has been considerable more information and pictures gathered, and we intend to update this website fully by the end of October.
We are now in the process of updating the final information from the M1038, and are currently in the process of repowering an M998 with a 6.5TD removed from an M1114.
Please feel free to email us with any comments or requests.