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HD-4 lubrication oils

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Randy Howard

Member
Got my Allis Chalmers HD-4 running and now want to change all the fluids. The factory manual says that for the torque convertor to use "Type A". What the heck is that? Also, for the transmission it says "20-20W". Is that right? The transmission and differential share the same oil and I know for sure it has 90wt gear oil in it right now.
 
Your torque-converter is going to care what ATF you stick in it since it does not use any clutches. The original Type A used whale oil for a friction modifier to soften shifts. That modifier was most important for wet clutches, which your HD4 does NOT have. Whale oil got dropped in the early 70s and new modifiers got used instead that did NOT have to come from whales and also sustained higher temps. So, the only concern is maybe, viscosity. Dextron, Dextron II, and Ford CJ are the closest to what Type A was. I've used Dextron for many years in my HD4 with no ill-effects.

In regard to viscosity for trans-oil, you are mixing up two types of specs. Oil the same thickness can be expressed in two different ways - engine or trans. The "20-20W" AC mentions is an engine-oil spec. That is basically the same as 75W-80W gear-oil spec. and they mention it to give good all weather protection. Engine 30W or 40W oil is equivalent to 90W gear lube.

If you buy trans-combo oil it will be equivalent to 20W engine oil in thickness which is basically exactly what AC called for.
 
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