RealLiveMD

iTrader: (1)

Not sure if you were responging to me or the OP. I did see my pattern change after the 500 mile break in period. And They use a crush sleeve and loctite on the pinon bolt. The odd thing is, I hammered my O.E. 3.42 in his parking lot after he'd just put them in. No whine, no noise. However two different 3.90's and one 4.10 from motive howled like a wolf. I'm starting to believe that it's actually in the gear.

venom_909

Im Tired Of Re Doing My Gears It Seems Like It Just Gets Worse Every Time !!!!!!!!!!!!!!!!!! Has Any One Got There Gears Done And Not Have A Problem If So Tell Me Where So I Can Take My Car............

boilertwinkie

iTrader: (1)

Mine had no whine for 200 miles until I punched it and then I got a little whine on coast pinion nut loosened? Whine was less than my stock 2.73. Keep in mind, I have a frame mounted T/A which allowed for my oem 2.73 to whine.

TXZ28LS1

iTrader: (5)

i had 2.73 and had motive 3.73 put in. i would say it whines just a tad bit like others have said when decel.

JayplaySS

iTrader: (15)

Old thread eh?

01ssreda4

iTrader: (96)

1. are you saying premature rough housing the rear end can actually cause whine after it was previously silent??
2. 10 bolts use crush sleeves
3. weld the pinion nut to what exactly? the shaft of the pinion gear? bc that would ruin the threads.

i installed some 4.10s two weeks ago and set the pinion drag at 30 inch/pounds with a .006 backlash while reusing all the factory shims and after about 200 miles it is dead silent ( Motive stock replacements). this rear had LOUD noise on decel and although the pinion bearings may have been at fault the only bearing to show any wear was one carrier bearing that chewed the **** out of the race. i got some Motive Performance 3.73s going in mine with .007 backlash with 30 inch/pounds of pinion drag, so i will let everyone know how that turns out.

EDIT: just took my first spin with my 3.73s and not one hint of noise. i will be going easy for at least a couple hundred miles......

trax

iTrader: (2)

That's what I've been told. I'm not sure what the exact process is that happens during break-in. It might be something to do with the contact surfaces of the ring and pinion... but I'm the wrong person to ask about that.

In a nutshell, I think that if gears are installed properly in a street-driven car that never sees the track, you can probably expect them to remain quiet. I think what kills them are wheel hop and hard launches.

From the factory, yes. But Ratech does make a solid pinion spacer. (See here).

When Speed Inc. installed the 4.10's in my 10-bolt, they put a single tack weld between the pinion nut and the threads of the pinion. When I grenaded the rearend a few years later, it was easy enough to grind off the weld bead with a quick brush from my grinder. The threads were certainly messed up after that, but I think that's one of the only ways you can really secure the pinion in these cars. It seems like a good hard launch will deflect *something* (I'd guess the pinion), which seems to compress the crush sleeve and screw up the tightness of the nut.

01ssreda4

iTrader: (96)

well i certainly agree with that. the rear i put 4.10s in was a 100k 10 bolt that was living a quiet peaceful life, then a couple hard launches at the track on street tires is all it took to make it start howling terribly. it howled on decel.

onefastmx5

iTrader: (6)

My motive 3.73s were quiet for about 35 miles, then the pinion nut backed off a smidge. Got a loud whine, limped it home, retightened the nut and now have a slight whine on partial accel (queit on hard accel/decel). Makes a clunking sound under heavy accel in 1st gear only, but I'm pretty sure that's the diff going out (maybe just wheel hop??). Gears looked fine at 500mi.

Camaro Z

iTrader: (5)

Not true, my motive 4.10's are very quiet.

79TAKid

iTrader: (1)

Ok, I'm posting under my kids name. You are all ******* wrong, no gears make any noise if set up right, and if you tighten a pinion nut that is not loose you will burn up the bearings. I do one rearend a week, and have for 30 years. I have 5 LS1 cars and they are all quiet, 7.5's are the hardest to do, but they can be done right. Anyone that tells you low gears are noisy doesn't know how to set them up properly. The 4.30's in my Firehawk are quieter than the factory 3.42's. My kids 3.73's and 4.10 cars are quiet. If I do a rearend and I can not make it right I do it for free. I'm in St. Louis if you want me to do them correctly for you.
thanks Paul

Irocem99

Mine do it too..Its does it bigtime at decel,but also when around 20-30 mph..But.. did you go from 2:73 - 3:73..I did,I had to get the thick gears and they said that is why it does it..

Bad_tx_Z28

iTrader: (3)

i went from 2.73's to 3.73's as well. After mine were installed they were pretty quiet, for richmonds, but after about 1000 miles it started to howl incredibly loud. I checking it out and the pinion nut backed off. Tightened it up and not its queit on decel.