Thread: 1979 c30 454
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Old 12-11-2010, 02:58 PM   #15
MTCK
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Location: Fairbanks, AK
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Re: 1979 c30 454

Darn right, and that's a lot cooler than a new 50k 1-ton and the payment that comes with it. I used 75W90 full synthetic in both diffs, t-case and transmission. My concern was cold weather performance, but it seems to synchronize between gears much better with the new fluid. The old stuff looked like chocolate syrup.
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1991 V3500 L29 454 4L80E NP205 D60/14 Bolt 4.56's
1984 K30 292 TH400 NP205 D60/14 Bolt 4.56's flat bed 7'6" Meyer Plow
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