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Did you decide if there is some adjustment in the pinion gear? I can rotate my front almost 3 inches. My rear is new and it has no play. Mine has also started grinding/vibrating so I know its on the way out. My rear did the same. Can I just rebuild the top pinion? Thanks for the help.

The pinion is 1" with a 20 thread pitch.

Anyone know the size and pitch of the pinion nut and threaded end? Looks like I've started cross threading mine and need to get a tap and die to clean up the threads. I tried cleaning them with a small file....but no luck. Thanks.

The transmission is a 3 speed automatic from a gmc 3500. The year is either 1991 (the body) or 1984 (the motor). There is only one lever through the floorboard, which is the bottom one. The top lever of the TC is hi/lo and it just stays in low. I can push the lever in the truck forward, which...

It is a T-136-21 sprag unit. I misread the number.

t-136-27 Any ideas how to adjust the sprags...or are they just worn out and need replaced. My truck goes into 4wd in reverse and has only engage 4wd forwards one time. I have an Offroad truck with 2.5 ton axles and the t-136-27 sprag transfer case. I'm not sure what part comes out of adjustment