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Old 01-03-2013, 12:19 PM   #11 (permalink)
Diesel Master
Join Date: Mar 2007
Location: Indianpolis IN
Posts: 3,560
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Gear oil makes for a great choice for t-cases that are gear-to-gear.

Our trucks (using the NV261/263) are chain driven. They will not prefer the gear oil.

Stick with ATF. If you want something "better", then use synthetic ATF.
2006 White Chevy CC 4x4 3500 SRW W/T
6.6L Duramax LBZ / Allison trans / manual T-case with Riverside Gear pump-rub-elimination upgrade / coolant bypass filter / PCV reroute
Fumoto drain valve / Power Steering Cooler added / Inverted Tranny Cooler / Autometer pyrometer / home-made diff cover / upgraded x-fer case skid plate

Member #2 of the "OIL is OIL" association
I used to use dino oil because I didn't know any better.
Then, I used synthetics because I thought they were "best".
Now, I use dino, because I know the truth!
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