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Discussion Starter · #1 ·
well I finally got a round tuit for the assembley and setup for my Chrysler 8 3/4 rear last night, after the 3rd time of teardown and assembley with different shim thicknesses for pinion spacing I ended up with .008 pinion shaft end play , measured from the end of the pinion shaft moving in towards ring and out away from ring gear (with my new dial indicator i scored from ebay), and i got it adjusted to .016 backlash measurement (ring gear movement before contacting the pinion gear), it spins real ez and with almost 0 effort, now im doing this with out a spec sheet handy for the 8 3/4 so I dunno weather these measurements are in the ball park according to the manufacturers specs, but the gear mesh patternt I get with the yellow paint (gear mesh compuund) is touching exactly where the gears rode in their previous life,( I got em off ebay used so they already had a slight wear pattern) I tried to get less than .016 backlash but when i do the gears dont mesh smoothly,, even at .014 or less they start to get rough and have spots where it gets harder to turn, almost as if there was something holding them at spots in the rotation, and if i get too much more, over .020 the same thing happens, not to mention that the gap between ring and pinion teeth grows and seems like it takes a good bit to actually engauge eachother, does anyone know actual measurements of proper backlash and pinion shaft end play? or does it sound like i did it right? it sure seems like it rolls good and will easily turn my axles without any binding , but i have no way of putting a load on it til its goes into the truck, any ideas/comments would help
 
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when installing used gears the only pattern that counts is on the coast side. you're stuck with whatever the backlash ends up being.
 

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Discussion Starter · #3 ·
well does it sound like mine are set up right? or ?
 

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I'm thinking the spec on backlash is more like .008 or .010".You may have to play with the pinion depth some more to get correct pattern and proper backlash. Then again .016 may work.
 

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Discussion Starter · #5 ·
Does anyone Have an Official spec on the 8 3/4? I was thinking it was less too but i dunno
 
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