3:23 to 4:10 wow
Thread Starter
Teching In
Joined: Sep 2012
Posts: 38
Likes: 0
From: Gastonia nc.
3:23 to 4:10 wow I finally did the swap to 4:10s in my 95 Z28 a4 with a built trans.I did A complet rearend rebuild and it made a big diffrence.The lanch is very strong and my shift kit really came alive.There is a wining noise in the rear just wanted to know will it go away or stay the same. Sorry about spelling and stuff i have parkinson hard enough just to type.
Ive never experienced it, but I would suspect a rear end that whines always will. When one doesnt whine, thats when you know it was set up very very good. But even if it does whine, its not a sign that its about to blow up and needs to be fixed ASAP, some gears just do that.
Thats atleast what ive read, if im full of **** someone can correct me.
Thats atleast what ive read, if im full of **** someone can correct me.
TECH Enthusiast
Joined: Aug 2010
Posts: 543
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From: New Hampshire
What brand gears did you put in?
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Without going back in to re-set them up, if they're whining now, they will always whine. And.......re-doing them is no guarantee that it will stop.
Out of all the GM, Motive, and Richmond gears I've used that were set up by a guy who knows it well (I'm excluding the one set I did myself!), I've had only one set (a Richmond 5.57 set for a GM 8.5" 10-bolt) that made any noise at all.
From what you describe, the whine you hear will never hurt a thing. It has nothing to do with how you break them in.
Good move on going to the 4.10's .......miles of smiles
Out of all the GM, Motive, and Richmond gears I've used that were set up by a guy who knows it well (I'm excluding the one set I did myself!), I've had only one set (a Richmond 5.57 set for a GM 8.5" 10-bolt) that made any noise at all.
From what you describe, the whine you hear will never hurt a thing. It has nothing to do with how you break them in.
Good move on going to the 4.10's .......miles of smiles
The gear setup is EVERYTHING. Being meticulous ensures a quiet rear. Meticulous means setting the pinion depth and backlash within .002" of spec. Meticulousness is EVERYTHING.
Breaking them in is more about heat cycles than actual mileage. Don't expect to just go drive for an hour and expect them to be broken in. I would drive for 10-15 minutes, allow the rear to cool COMPLETELY, then repeat 2 or 3 more times after that. After 4 or 5 heat cycles AND a few hundred miles you should be good to go.
For what it's worth though on a 12-bolt or 9" once you put a few heat cycles on them it's safe to go tear ***. No need for a mileage-specific break-in on those bad boys.
Breaking them in is more about heat cycles than actual mileage. Don't expect to just go drive for an hour and expect them to be broken in. I would drive for 10-15 minutes, allow the rear to cool COMPLETELY, then repeat 2 or 3 more times after that. After 4 or 5 heat cycles AND a few hundred miles you should be good to go.
For what it's worth though on a 12-bolt or 9" once you put a few heat cycles on them it's safe to go tear ***. No need for a mileage-specific break-in on those bad boys.
Thread Starter
Teching In
Joined: Sep 2012
Posts: 38
Likes: 0
From: Gastonia nc.
the guys i had install them said it to .005 i don't know about how all that works but he said the pinion was set at 37. they had to reset it after the pinion bearing failed after a short drive. thanks for the break in advise been doing that all day. with my shift kit it spins going into second just normal driving. thats not going to effect the break in is it.
