What is the right oil to use in a Ruckstell rear end .... I have some 80/90 gear oil is this ok or do I need to get something else .. Thanks for any help ... Joe
I believe something like 90 or 140 weight gear oil is recommended. Use of the standard 250 wt oil is not recommended. I run a full synthetic 75W-140 in mine. No problems going on 3 years of use.
The accepted gear was always 140 for regular T rear end and 90 for the Ruckstell.
I always recommend 75-140 for either.
Could also use 80-90 in the Ruckstell.
It is worth the extra cost to use synthetic gear oil, it doesn't stink up the garage if it leaks out on the floor. That can be important if you keep your T in an attached garage.
I've been using 140 for years. 90 wt. can leak more.
Are the synthetic oils friendly to yellow metal?
Yep. Answered that one a while back ago.