So I get this diff that is suppose to be rebuilt. I put it in and its had a major bearing whine. I've never rebuilt a diff but I am sure it wasn't suppose to whine this bad. I also noticed the flange was a little wobbly on the driver side. I put in the driver side outside bearing race till there is no movement with the flange and I measured the gap to make the shim. .0600" Seems kinda thin since the small shim BMW makes is 1.8mm. But as seen in my other thread, I made a shim and put it in. the whine reduced but I notice a lot of slamming.
Later on a had to replace my guibo. And while I was down there I noticed a lot of backlash in the diff.
Fast forward to trying to use medium case flanges and e30 axles in a small case lsd, when I removed the flanges to check the shaft seals (then realized that the flanges themselves were sticking out too far) I pulled out the carrier. I wanted make sure there wasn't any damage from the flanges hitting the spider gear pins. No damage as I didn't go far before I realized my car was spraying Amsoil diff lube everywhere.
As I was reassembling everything, using the shims that came with it, I noticed the carrier wasn't tight between the outer races, and there was about .250" of backlash. Minchia! Earlier when I put the smaller shim in it tightened up the carrier but pushed it further away from the pinion. Using all the shims I could find between my two diffs and a couple spare shims, I re-set it up to .004" backlash and .0016" play between the carrier bearings (should be 0000 with 11 in/lbs of rotating resistance on new bearings.) But I needed my car today so I left it for now. Put back in the ti's stock axles after repacking the noisy cv joint (reason why I was trying to use e30 axles.)
This morning, the car's rear end is quiet as a mouse. When I move into my new shop in November (with lights and heat), I will remove the ring gear, leave the driver side shims, tighten the 4 bolts down on the passenger side outside bearing (without shims) till I get 5 - 10 in/lbs of rolling resistance, measure the gap and make the shim.
Later on a had to replace my guibo. And while I was down there I noticed a lot of backlash in the diff.
Fast forward to trying to use medium case flanges and e30 axles in a small case lsd, when I removed the flanges to check the shaft seals (then realized that the flanges themselves were sticking out too far) I pulled out the carrier. I wanted make sure there wasn't any damage from the flanges hitting the spider gear pins. No damage as I didn't go far before I realized my car was spraying Amsoil diff lube everywhere.
As I was reassembling everything, using the shims that came with it, I noticed the carrier wasn't tight between the outer races, and there was about .250" of backlash. Minchia! Earlier when I put the smaller shim in it tightened up the carrier but pushed it further away from the pinion. Using all the shims I could find between my two diffs and a couple spare shims, I re-set it up to .004" backlash and .0016" play between the carrier bearings (should be 0000 with 11 in/lbs of rotating resistance on new bearings.) But I needed my car today so I left it for now. Put back in the ti's stock axles after repacking the noisy cv joint (reason why I was trying to use e30 axles.)
This morning, the car's rear end is quiet as a mouse. When I move into my new shop in November (with lights and heat), I will remove the ring gear, leave the driver side shims, tighten the 4 bolts down on the passenger side outside bearing (without shims) till I get 5 - 10 in/lbs of rolling resistance, measure the gap and make the shim.
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