6-speed transmission lubricant

[Gordon Maney]

Is there a commercially available lubricant for the 6-speed transmission that equals the Mopar product specified? Is there something that can be used in this trans and the axles, and possibly the transfer case as well?

 

[Riflesmith]

Gordon,

The oil in the six-speed is quite thin, similar to 5W30 motor oil. The Mopar specified lube is quite expensive. I use Amsoil 5W30 heavy duty diesel engine oil in mine. 22,000 miles and no problems. Shifts smoother than stock in all temperatures. I took and oil sample and sent it in to be analyzed on 1/14/02. I will post the results as soon as I get them.



Others are using Redline MTL with good results.



The transfer case takes ATF, the axles take gear lube, so there is no one-fits-all lube.

 

[Texas Diesel]

Riflesmith:



Keep us posted, you're the first one with big enough bal, uh, enough guts to try it! I'd love to find a synthetic to put in 'er!

I guess that only extended use and mileage will answer the question.