From everything I have heard speaking with bus and motorhome DP mechanics, you can definitely run synthetics in your differential rear-end and Allison automatics.
Surprisingly with synthetics in a differential, Rockwell is showing what appears to be a GL-4 50W Transmission Fluid which would appear to be much lighter than a standard 80/90W gear oil. In all actuality transmission fluid viscosity is measured differently than differential oil.
This is what is currently recommended:
Rockwell Differential. 3.58 Ratio - Delvac Synthetic Transmission Fluid 50w Part# MBL 98HL93
Allison HT-755CR - Delvac Transmission Synthetic Fluid Part# 27101-CTCS
Something I would highly consider when switching over to the synthetics is replacing your seals. There have been problems with older seals leaking when switching to the thinner higher lubricating synthetics.
__________________
Ken
Previous Owner of 3 Newell's
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