[Jim]

Don’t know what model Allison you have but in my 755CR 1991 XL, Prevost Fort Worth put Transynd in mine.

[Harry]

We’ve used synthetic ATF for 10+ yrs in all of our Allison trannys. Currently we have Mobil Delvac 1 synthetic ATF in our Allison B500.

Here are the ones that Allison approves:

Allison Approved TES 295 Fluids:

Castrol TranSynd

BP Autran Syn 295

BASF Emgard 2805

International Trucks Fleetrite Synthetic ATF

Mobil Delvac 1 Synthetic ATF

CNH HD Synthetic ATF

Mack Bulldog Synthetic ATF

Shell Spirax S6 ATF A295

[Larry]

Oh NAPA sell the Mobil Delvac Synthetic 1. Should a bit of a discount with our Napa card. How many gallons does B500 hold off top of someone’s head. Trans service is part of our Prevost service visit next month

[Suzanne]

31 qts is what the Allison service tip #1099H indicates for the 4000 series w/2″ sump which is about the same as our B500. When I did ours it was around 7 gals.

Allison tip #1099H link