According to Beaver at Winters QuickChange rear ends, " you don't need no stinkin rear end pump to run five miles, unless you want one more do-dad to chance screwing up".........Bob, who spent three grand there and was talked out of a pump.................
Bob What did Beaver recomend for oil in our situation? I put TDH ( transmission,differential,hydralic) oil in my Muncie and my Winters quick change at speedweek.
My first pass the car started slowing at the 4 mile. By the time I got to the return road the car would not even roll. Turns out 1st gear became one with the mainshaft in the trans.
I did some percision machine work with a Makita grinder ( ground off all the teeth on first gear) and kept running. I put 85w 90 in the rear before I made any more passes as I did not think I had any extra gears to grind on in the rear and did not want to take any chances. That said I did not see any problems with the rear and would like to try some lighter oil again.
The trans shop I bought my new Muncie parts from recomended 50w in the trans. This is standard OP in Roadrangers ( big truck transmissions) but as I said above I am a little gun shy at this point. Thanks Vince