pettyboy69

So I just got done swapping my rear end out with a completely different rear end from a buddy's car. He said it has always made the whining noise ever since he put the richmond 4.56 gears in it. It makes noise at constant speed and acceleration as well. It gets loudest around 50-60mph and quiets down after 70mph.

My biggest question is this whining normal? Seems like back lash is probable set wrong, but my buddy auto crossed many times and a lot of miles on this diff with zero issues, and I heard that Richmond gears make more noise than normal but it gets pretty freaking loud

Thanks in advance, I tried searching but couldn't find anything

MBHs2k

Yes whining is normal. From what I've seen the 4.56 gears whine the most.

S2KPUDDYDAD

The rear may need a tune up, the pinion bearings may have to light of a preload on them now with all the miles and auto cross use. The 4.56 does have a gear whine but it should not be that bad.

s2k manic

was going to start a thread similar to this. I get a whine on deceleration no vibrations or anything I installed the j's racing pinion spacer and comptech upgraded main caps I set pinion turning torque at 6 fltbs and the back lash at 6 thousands im thinking this is the cause of my whine I set the gears up on the tight side have a good centered contact patch. what do you think puddydaddy? thanks for any info as this is my first s2000 diff have setup gm and Dana rears this thing is like a mini 9 inch ford I figure the setup I have should be good for 400 hp or at least the 350 ish whp right now 320 hp at 8 psi I also have a 10 lbs pulley that gives me 355 whp 230 tq

S2KPUDDYDAD

If you set the rear using new bearings, the specs you set with will cause failure in short time!! If you used, used bearings you still need to address this right away but, you have a better chance of still having some load left.
Your backlash is on the wide side and maybe out of spec now. Your pinion preload was way to loose and now that the rear is ran is probably nothing!!
What ring and pinion gear set did you use? If you used, used gears did you check them for stress cracks before installing them?
As to the Comptech housing that you used, were the caps machined using a smooth machine radius or did they look like they were gouged? The CT caps and the KP caps I have been seeing have fitment issues and look to be gouged to fit.

The J’s racing “pinion spacer” or collar is a nice piece but requires a proper shim to fit. Getting the right shim is the hard part and can be very time consuming waiting for them to get it to you and also, very expensive if you don’t get it right the first time. I have helped out many guys with this issue over the years trying to get them what they need, to get their setups right.

I get PMs all the time inquiring about my PuddyMod solid steel sleeve. I do not sell it on it’s own for a few reasons, the first is it is not a shimmed part, it is custom hand fitted to the rear, no shim.

I would be more than happy to fix your issue and the Ops issue if you guys like. I wont charge you guys any labor fees. Your only expense will be shipping, any parts needed to fix, also, $25 to help cover cleaning and a fresh paint job. If I have a part you need that is used but in great condition at the shop such as bearings, shims, and what not I will give them to you at no charge as well.
Here are a few pics of common issues found that can be causing your problems,

S2KPUDDYDAD

Here is a properly fitted old Comptech housing from years ago, I still had to finish file by hand to get it perfect but, it was much better back then.

pettyboy69

Thank you sir, I will gladly send this rear end to you, it just sucks because it is my dd and I don't like having it down.

I might just send you the new kp housing I just got back and have you pull the Richmond gears and stock diff and swap it into this housing. What would you charge for that? Very interested since there isn't much interest in my kp housing for sale

S2KPUDDYDAD

I seen your for sale thread and I have a question, is the KP case you are selling in your F/S pic you posted the way KP sold it to you? The case you have in your pic looks dirty and has old sealant on it, do they send it out like that?


You are welcome to send everything you have and I'll swap it all over for you and refit the whole shooting match so it's right
You will need to find a way to get around for about a week to 2 weeks before you will get it back. I need time to do the work and allow time for shipping back and forth.

s2k manic

thanks for the help will be pulling it asap and those caps are shameful mine are much nicer looking thank you for your help and contributions to your fellow s2ki members

S2KPUDDYDAD

Yes, they do look pretty bad let me know when you do send it in