Dzimm Posted March 3, 2020 Author Share Posted March 3, 2020 16 minutes ago, ghetdjc320 said: You shouldn’t need to reset pinion depth unless it wasn’t right from the get go. This would be the time to replace the pinion and carrier bearings though but it sounds like that is not a feasible option at this point. That’s neat that it has the adjusters. Similar setup to a ford 9” Sooo I bought it, gonna give this a shot. After watching a few videos and doing some more research I'm pretty confident I can do it and now is the time to do it since the axle isn't in the truck yet. The carrier has new bearings on it already. I probably won't touch the pinion aside from the seal if I don't have to. That would just leave the pinion and outer shaft bearings original. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted March 3, 2020 Share Posted March 3, 2020 Sounds good, let us know if you have questions Link to comment Share on other sites More sharing options...
Dzimm Posted March 3, 2020 Author Share Posted March 3, 2020 1 minute ago, ghetdjc320 said: Sounds good, let us know if you have questions Will do thank you! Link to comment Share on other sites More sharing options...
Eagle Posted March 4, 2020 Share Posted March 4, 2020 On 3/2/2020 at 8:28 PM, Dzimm said: So the only shims in the C8.25 are between the pinion and pinion bearing. The carrier has adjusters that require a tool that goes in through the axle tube to adjust the preload. It looks to be pretty darn simple to do. Especially since I won't be messing with the pinion aside from the seal. I suppose though with a new carrier, would you need to reset the pinion depth? No. Leave the pinion alone. What you need to do is check the backlash on the existing setup, and maybe use some marking compound and take photos of the pattern ... then adjust the backlash with the new carrier to the same as it was before. As you have learned, the 8.25 doesn't set the ring gear engagement with shims, it uses that long tool to reach in through the axle tube to turn the adjuster. Set it so the backlash matches the existing reading, then use the gear marking compound for a visual check that the pattern is the same. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted March 4, 2020 Share Posted March 4, 2020 2 hours ago, Eagle said: No. Leave the pinion alone. What you need to do is check the backlash on the existing setup, and maybe use some marking compound and take photos of the pattern ... then adjust the backlash with the new carrier to the same as it was before. As you have learned, the 8.25 doesn't set the ring gear engagement with shims, it uses that long tool to reach in through the axle tube to turn the adjuster. Set it so the backlash matches the existing reading, then use the gear marking compound for a visual check that the pattern is the same. Good advice. I would also add that you should take plenty of pictures of the contact patter and every measurement you take for reference. Link to comment Share on other sites More sharing options...
Dzimm Posted March 4, 2020 Author Share Posted March 4, 2020 Thanks guys, I will definitely take measurements and lots of pictures. Link to comment Share on other sites More sharing options...
derf Posted March 4, 2020 Share Posted March 4, 2020 7 hours ago, Eagle said: No. Leave the pinion alone. What you need to do is check the backlash on the existing setup, and maybe use some marking compound and take photos of the pattern ... then adjust the backlash with the new carrier to the same as it was before. As you have learned, the 8.25 doesn't set the ring gear engagement with shims, it uses that long tool to reach in through the axle tube to turn the adjuster. Set it so the backlash matches the existing reading, then use the gear marking compound for a visual check that the pattern is the same. x2 Don't touch the pinion. Leave the adjusters alone to start. Swap the ring gear over and install the differential. Measure, adjust, measure, adjust, etc. until you get a good matching pattern with backlash in spec. And when you adjust, turn both sides the same amount in the same direction. You want to keep the distance between the two the same so you keep preload on the bearings the same. You just want to move it towards or away from the pinion and leave everything else alone. Link to comment Share on other sites More sharing options...
Dzimm Posted March 4, 2020 Author Share Posted March 4, 2020 3 hours ago, derf said: x2 Don't touch the pinion. Leave the adjusters alone to start. Swap the ring gear over and install the differential. Measure, adjust, measure, adjust, etc. until you get a good matching pattern with backlash in spec. And when you adjust, turn both sides the same amount in the same direction. You want to keep the distance between the two the same so you keep preload on the bearings the same. You just want to move it towards or away from the pinion and leave everything else alone. What I was seeing the way to do it was set the backlash spec with the driver's side and then torque the passenger side and measure the backlash to make sure it stayed. I'll have to look into that part a little more. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted March 4, 2020 Share Posted March 4, 2020 6 hours ago, Dzimm said: What I was seeing the way to do it was set the backlash spec with the driver's side and then torque the passenger side and measure the backlash to make sure it stayed. I'll have to look into that part a little more. Makes sense. I would personally reset the preload and backlash since sometimes the factory didn’t even get it right. Once you set your backlash, set your preload then double check your backlash to make sure it is still within spec. Link to comment Share on other sites More sharing options...
Dzimm Posted March 5, 2020 Author Share Posted March 5, 2020 1 hour ago, ghetdjc320 said: Makes sense. I would personally reset the preload and backlash since sometimes the factory didn’t even get it right. Once you set your backlash, set your preload then double check your backlash to make sure it is still within spec. Yeah I'll measure what it is currently and when I set it up to see what it was but will set it on the tighter side of the spec range. I figure over time it will wear and loosen up a tad bit. Link to comment Share on other sites More sharing options...
Eagle Posted March 5, 2020 Share Posted March 5, 2020 2 hours ago, ghetdjc320 said: Makes sense. I would personally reset the preload and backlash since sometimes the factory didn’t even get it right. Once you set your backlash, set your preload then double check your backlash to make sure it is still within spec. He's re-using the existing ring and pinion gears. He needs to match the existing contact pattern as closely as possible or the diff will be noisy (noisier than 8.25s are anyway). Link to comment Share on other sites More sharing options...
ghetdjc320 Posted March 5, 2020 Share Posted March 5, 2020 9 minutes ago, Eagle said: He's re-using the existing ring and pinion gears. He needs to match the existing contact pattern as closely as possible or the diff will be noisy (noisier than 8.25s are anyway). Ahh gotcha. I need to re read the intro lol. Yep, match those measurements then Link to comment Share on other sites More sharing options...
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