rear end hellppppp!

[ladenblowfish]

Guys I just installed my 410 gears today. Now I'm having big problems. I have a loud roaring and whinning noise coming from the rear while going down the road.. When I put the trans into reverse, a loud clunking noise comes from the rear. Last but not least, when Im slowing down to a stop, I feel a harsh thud coming from the rear. ANY IDEAS PLEASE. I've done gear swaps several times before and never had these kinds of problems. These problems were not here before the swap.

 

[kustomizingkid]

Sounds to me like the gears aren't set up right, definetly sound like there is way too much backlash.

 

[02V8Sport]

if you have done several swaps before you would know the clunking is from too much backlash and the noise is from not adjusting the pinion gear to properly drive the ring gear. Did you mark the gears to see where the teeth make contact?

 

[BAD97LSC]

this is the exact reason why i'm paying a pro to put my gears in !!! i can do almost anything to a car, but i am not playing games with the rear diff.

 

[AbrahamLincoln]

time to pull the rear out again... did you get a driveshaft with it as well?

 

[driller]

How did you setup the pinion depth?

How much backlash did you end up with?

New bearings or old? The preload on new bearings should be on the tight side while the preload on old bearings should be middle of the road.

 

[ladenblowfish]

So by the way I described everything, the problem lies with the diff being set up wrong? Too much backlash? I did reuse my old bearings. My first mistake.

 

[ladenblowfish]

Any prices on how much a shop would charge if I took them the diff and them set it up?

 

[kustomizingkid]

Your prolly looking at $300-$500 for a shop to do it.

 

[Markviiiedrea]

I had a reputable shop do mine here for 280.00 but I supplied all the parts and brought just the diff to them.

 

[ground_zero298]

If their is any shavings in the rear end from the gears being setup wrong, your in for a ride. The whole rear end will be contaminated. Meaning all new seals, bearings, plus the carrier must be cleaned.

 

[driller]

I did reuse my old bearings. My first mistake.

Not really. I've redone lots of straight-axle rear ends with 'old' bearings. Just realize the bearings need to be good and the run-in is already over with, hence setting the pre-load less than new bearings.

Either the pinion depth, backlash and/or bearing preload is whacked.

 

[Roadboss]

probably trashed a set of gears too !!

 

[BAD97LSC]

right, it doesnt take long to wreck a new ring and pinion, specially if installed way wrong, like it sounds these have been. you better have them checked out before you set everything correctly now, because it may be too late.

 

[turborich]

this is the exact reason why i'm paying a pro to put my gears in !!! i can do almost anything to a car, but i am not playing games with the rear diff.

Exactly! I have the same thought when it comes to the rear end & gears.

 

[driller]

Exactly! I have the same thought when it comes to the rear end & gears.

It's not really THAT difficult, there's just little room for error.

If you do not set the pinion depth right, no amount of shims on the differential will make it right. It's the number one reason for failure.

Set up the preload on bearings too loose and you will soon have lots of free travel, noise and wear even if the backlash is initially correct. Set it up too tight and the excessive preload will cause heat and trash the bearings in no time.

While backlash is often critical for longevity and lack of noise, ironically it is the most forgiving when it comes to making a mistake. Too little will likely cause excessive wear while too much will be clunky and wear out prematurely. Wear due to incorrect backlash will result in contamination and finally bearing failure.

I always recommend someone seek help if they've never setup gears before. But once done a time or two, with proper tools, parts and specs, it really isn't difficult and can be rewarding when done by yourself and the result is spot on perfect.

 

[turborich]

It's not really THAT difficult, there's just little room for error.

If you do not set the pinion depth right, no amount of shims on the differential will make it right. It's the number one reason for failure.

Set up the preload on bearings too loose and you will soon have lots of free travel, noise and wear even if the backlash is initially correct. Set it up too tight and the excessive preload will cause heat and trash the bearings in no time.

While backlash is often critical for longevity and lack of noise, ironically it is the most forgiving when it comes to making a mistake. Too little will likely cause excessive wear while too much will be clunky and wear out prematurely. Wear due to incorrect backlash will result in contamination and finally bearing failure.

I always recommend someone seek help if they've never setup gears before. But once done a time or two, with proper tools, parts and specs, it really isn't difficult and can be rewarding when done by yourself and the result is spot on perfect.

OK Driller, Next time your in Vegas stop by & I'll let you do my gears!

Sound good?

Sounds like you have done them a few times, I would not even attempt gears myself for the first time because of all of the bad stories that I have heard about. Just my choice to be cautious.

 

[driller]

OK Driller, Next time your in Vegas stop by & I'll let you do my gears!

Sound good?

I'll be out there in September working a trade show!

 

[Abbens]

Did you remove the thrust washer out of the diff? because you aren't supposed to. Also how much play does the yolk have?