Fixed to slip yoke

[DmaxMaverick]

OK. That does sound like a fun, unique project. You should only need the OEM slip-yoke, then (such as from a 2WD short wheelbase or updated long truck). There is no distinction between the fixed and slip output shafts or seals that I could find in my LT manuals. There may be a difference due to the 5500 application, but I'm not finding any. Just replacing the fixed with a slip yoke should be all. The torque on the fixed yoke bolt is published 90 ft/lb, but may have thread locker (may be a bear to remove, don't torque against the parking pawl).

You might have a look at Robyn's "Van-Cat" thread in the Community Forum. A lot of discussion regarding custom drive shaft, angles, joints and such there.

[Hal StClair]

Thank you very much for that information. It's exactly what I was looking for. This is my first introduction with a Dmax and Allison. I've played with Diesels for more years than I care to mention. Drove a 180D Mercedes in high school, had a number of the Olds 5.7's, many VW's (have one now) Chevy 6.2's, Ford 6.9, 7.3's, and even did a bus conversion installing a 14 ltr Detroit S60. I recently installed a 6.5 in another GMC using a 4l80e, Moorse transfer case, 9.25"AAM late front Chevy IFS. That was a fun project also thats proven itself over 25,000+ miles.
This one is a 'little' more of a project.
Hal

[Hal StClair]

With regard to the yokes, could a person weld up the bolt hole on a bolt in type yoke and use it as a slip? Is the slip yoke longer than the bolt in style? I'm having quite a challenge finding the part numbers for these pieces. Guess I just don't know where to look.
Hal