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All versions of Dexron are backwards compatible with all previous versions. The US Army currently uses 15w40 in older trucks (they never flush them to change the fluid type), and both synthetic blend Dex VI and full synthetic Dex VI in newer trucks (all the A1P2 FMTV's use Dex VI). It's up to...

As a shop owner, professional master technician, Motorpool veteran, and LMTV owner. This is my perspective. 1. In general, most people forget about transmission maintenance unless something prompts them to consider it. This is very often some sort of "behavioral" problem they perceive...

It looks fairly impossible on my M1079 without cutting out the frame rail and welding it back in. I'll look again though since that would be an excellent idea to do so.

Assuming it had 15w40 in the transmission already, then no. That should work fine. The military did switch to using Dex VI (synthetic is an option) in the 3700SP on the newer A1P2 trucks. FWIW. I switched mine over to mil spec synthetic Dex VI along with using about 3-4 additional gallons to...