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Called the Detroit Diesel shop/dealer in Roanoke, VA, and they confirmed that the C-2 fluid is not available. Dexron is a good ATF for this transmission. About mixing with the oil that remains after draining, he said that was not a problem, but repeating the drain and fill with fresh fluid would...

I communicate with Frank in OK off and on, he sold one 8x8 to Tom Bauer a few years ago and still has one XM757, which he drives in parades etc. Anyway, he say his retarder is hooked up. He should be providing details about it. Frank also found his steering linkages (=sealed ball joints) stiff...

I'm taking notes, Jon. It's a big beautiful transmission and I want the retarder to work too.

To get a better picture/comparison of the oils, I used the scanner. The used oil is on the right.

A sample of oil from the transmission on the right and Ursa 30W OE on the left.

Agreed, but I also must heed David Doyle's statement about not mixing OE and ATF and I'm not about to rebuild the transmission. If "the right stuff" can mix with some residual engine oil I am all for using it.

Sampled the transmission fluid and it looks and smells like used engine oil. It's almost black, so a change is due along with the filter. Capacity: 5 gallons.

When it warms up a bit here, I'll drain some fluid from the transmission to see what's in it now. When I checked the level some time ago it looked like OE on the dip stick.

Thanks Lance. I'm investigating the transmission fluid spec, the LO calls for "OE"....

The manual specifies a transmission fluid filter, AC PF-133-1 and the fluid as Type C2 MIL-L-2104 for the Allison TX200-6. The best I can do with Google is an AC filter PF1331, but it is not an "element" type it's a spin on, which will not work. For the fluid, I get Dexron III or type C3. Is...