| Trans Fluid in Final Drive [message #371428] |
Sun, 02 July 2023 22:42  |
Jess Bressi Cortez
Messages: 16
Registered: February 2014
Location: Orange County, CA
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Greetings all,
First some background: I have a recently rebuilt Turbo 425 that works perfectly, about 5,000 miles since the rebuild. I've used 100% full synthetic Valvoline MaxLife ATF in the transmission since the rebuild. The label on the jug says it is recommended for use in vehicles that use DEXTRON II, III and VI. Valvoline's website says it is backwardly compatible with DEXTRON. My final drive is a 3.70 from Applied. It has about 25,000 miles on it. After about 5,000 miles, I changed the Final Drive from Dino gear lube to full Synthetic Mobile 1 gear lube. The issue: I am leaking a little transmission fluid. It looks like it may be coming from the Final Drive. It doesn't appear to be coming from the Final Drive Vent nor the axles. I drained the Final Drive today and rather than draining the 4 pints/2 quarts I expected, I drained almost 6 pints/3 quarts and it has a decidedly red tint to it. When I installed the rebuilt transmission a year ago, I also re-did all of the seals in the Final Drive, including the expensive double pinion drive seals. Is it possible that the final Drive Pinion seals just can't keep fully synthetic tranny fluid out of the Final Drive? I'm thinking I should try old school Dino/Kerosene-based ATF and see if the problem resolves. Anyone hear of this problem before? Thoughts?
Jess Bressi
Orange County, CA
1972 and 1974 Cortez's
455's/3.70's/Patterson Q-Jets
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