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I just want to be clear my transmission was damaged before I put the new fluid in. I just found it as I was looking in the trans with the top cover off. I believe that the fluid that was in the trans previously (I suspect it was corn head grease) was installed to hide the problem.

That seems to be the thing with these trucks what one likes the other may not. I should have done the more logical approach and started with the cheapest option first but it is to late for that now.

It shifts with less effort now but fourth will grind really easy if the rpm’s are not just so. I got it from summit it is their transmission specific straight weight. To be honest I think it is synthetic but I don’t remember. I can look at the bottles and find out.

I just put mobil1 50 wt in my trans but in the process I found bad news. To fill it back up I decided to pup the top cover off instead of messing with filling through the fill plug. And I noticed that about 25/30 percent of the leading edge of the teeth on first gear are broken off. And fourth...

If you compile all the information from all the threads on this subject it will boil down to this. use yellow metal safe fluid. viscosity is not all that important or in more words you may have to try a couple different fluids until you get the shift feel you want. now on to some of my...