Manual Trans Lube

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I recently change out my trans lube using Mobil 1 synthetic, API 5; this was shown as compatible in Autozone computer. I could not locate the recommended Castrol Syntorq. With about 3000 miles on this lube, gear engagement going into 3rd is not as smooth as it was. I've got a couple questions. Did I use a lube that I should not have used? If I change it out, will I reverse the effects? What's the best lube to use? Thanks for responses.

 

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I'm going to take some guesses here due to lack of information about your truck. If you have the NV4500 5 speed, the Mobil 1 Synthetic Gear Oil 75W90 API GL5 rated transmission oil should not affect the shifting in a negative manner in only 3000 miles. The Castrol Syntorq LT is a GL4 rated oil, meaning it has less additives than a GL5 for wear protection. The GL4 spec is present as there is some evidence to suggest that using a GL5 additive package intended for differentials in a manual transmission with soft brass synchronizers will cause some plating out of the additives (phosphorus component to be exact) causing poor synchro function.
I work for Royal Purple Inc. We manufacture synthetic lubricants. I have safely used our synthetic MaxGear 75W90 API GL5 rated gear oil in my NV4500 now for 5 years and 100,000+ miles. We formulate with a very thermally stable synthetic additive package that does not have the inherent problems found in less expensive mineral GL5 rated oils.

I would tend to believe that Mobil formulates with above average additive technolgy and that this should not be a problem.

Royal Purple should be available in your area. Check at www.synerlec.com for the nearest retail outlet carrying our product. Should retail for 7. 95 to 8. 95 a quart.

If you want the Castrol product but do not want to pay 26 / qt from DC / Mopar - go to a GM dealer and get the oil for the same NV4500 as used in a Checy truck. Should be about 13 / qt.

Feel feel to page me at 800-206-1523 if you would like to discuss in more detail.

Thanks

Redram
David Canitz
Royal Purple Inc.
Technical Services Manager
Mechanical Engineer

Owner of Cummins powered Dodges for 10+ years.

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[Archive]

Believer,

Tougher shifts are probably not due to the GL-5 rated lube. I had Red Line GL-4 in my trans for a while. I noticed it was tougher to shift too. I now use Amsoil Series 2000 75W90, its a GL-5 lube. It shifts real smooth. Royal Purple is a very good lube too. I once had an oil analysis done with 5000 miles on Royal Purple 15W-40. The wear metals were LOWER than Amsoil 15W-40 with the same mileage. Tough Oil.

Some lubes just seem to be smoother than others. Red Ram explained it well #ad


Red Ram, Why did Royal Purple stop sponsering Shelly Andersen in NHRA T/F?

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Bill R
94 2500 SLT 4x4 5 Speed, 3. 54 LS, JRE 4" exhaust, Autometer Pyro, Boost & Water temp gauges, Bosch 215 HP injectors, Timing @ 14. 7 º, JRE Stage III #4 plate 270/675, AFC spring kit, Scotty Air, Bully Dog Propane Injection, Roadmaster Active Suspension, Optima Red Tops, Geno`s Exhaust Blanket,Espar Heater (won it!), Synthetic lubes throughout.

[This message has been edited by HEMI®Dart (edited 11-19-2000). ]