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Allison Transmission Question

8565 Views 5 Replies 5 Participants Last post by  pera730
I just finished rebuilding the 6-71 for the TDH 4512 listed in my Sig. The Allison V-Drive (pretty much the most bullet proof transmission I've ever seen) is in excellent shape and doesn't need any work.

However, it still has the original fluid in it from god knows when in the '70s. The GM manuals, which date from 1955, call out a GM part number for the fluid that is now meaningless. The trans fluid looks like clear hydraulic oil, and I'm wondering if anybody knows what a good replacement for it would be, or whether Dexron III would work as well.


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Is that the old one that used diesel fuel in the torque convertor?

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No. The Spicer version that was used from 1939 to about 1952 used diesel fuel in the torque converter. Runs a line from the fuel tank through the converter and back to the tank.

The Allison version is self contained and uses an oil of some kind in the converter. I think 30 weight might be too thick for what I see in there, but since that's what the engine uses it would not surprise me that GM made them use the same oil.

I will check with Allison.

Thanks for the replies,

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