I am installing ATS Carbon LSD, ITR trans.

I would like to hear from those who have adjusted the preload on tapered bearings (B,H series).

First to make clear: the torque measurement is the amount of torque it takes to break the diff free, i.e. to turn it initially from rest. We are not talking about the initial torque of the LSD itself, but that of the entire housing to turn on the bearings.

As a first try, after installing new tapered bearings using the old shims, I torqued the case down (without shafts or ring gear), and the friction was very small, but noticeable just by turning with fingers. I also noticed a clunking sound, that sounded like a bad bearing (they are new). So I lubricated the bearings with the ATS oil, and it seems much better, but there is no noticeable static friction to overcome (zero preload).

Does this mean that my shims are worn and the preload is now under spec? there are surface wear marks on the thrust + 79.5mm shims from the outer bearing races, case lands, etc... but nothing that looks abnormal.

I am in the process of making a good tool to measure (as a last resort using the axle w 32mm nut and torque wrench on that), but I'm sure it will not read anything at this point.

So I plan to order thicker 79.5mm shims to try,but I am wondering if this is normal?

I have the feeling it is much better too have too much preload than not enough..

I wish I would have changed to ball bearings I don't have a bearing separator to get the tapered's off!!

 

Well I think maybe the ATS diff is just a little shorter than the stock one. The shitty part is that with preload of zero, you don't know how many sizes of shim to bump up. I have an AL in there fromthe factory which is roughly middle of the range.

Instead of order a **** ton of shims I won't be able to return, I'm going to try to estimate by using aluminum foil layers as a shim until I get the preload near the range.

Thanks for your help everyone. Not.

 

https://honda-tech.com/forums/tech-misc-15/how-measure-clutch-type-lsd-preload-h-series-tranny-1913365/