LPE gear noise??? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

inferno camaro · 02-18-2012, 04:57 PM

I just installed a stock diff with LPE 3.70 gears in my car, it is supposed to have around 2500 miles on it. It has what sounds like a gear whine at normal highway speeds. If I get over 70 or so the noise seems to quit, or if I'm under 45 it sounds OK. Is this a normal thing with aftermarket gear sets? If I let off the gas it will quit for a couple seconds and then start again[not as loud though] I have only driven it about 5 miles so far.
I used royal purple 75/90 lube, would 90/140 help this at all. I also wondered if it could possibly be bearing issues? With 2500 miles I wouldn't think so.

inferno camaro · 02-19-2012, 07:37 AM

Anybody running aftermarket gears???

Eric Baker · 02-19-2012, 08:41 AM

Yes aftermarket gears will be noisier than factory to some extent, especially if you have aftermarket bushings installed. If they are really loud, they may be damaged or installed incorrectly.

IROCanSS · 02-19-2012, 08:50 AM

I had 4.10s, they whined, then broke, but thats not why. Wheel hop got them.

Now I have my 3.45s back in and they whine, same speed you describe. I think it has to do with the wear pattern. You can't install used gears and not have them whine.

inferno camaro · 02-19-2012, 08:54 AM

It does have solid bushings in it. I looked at the gears and can't see and wear with the naked eye, but maybe thats not possible. Its not loud just a little annoying.

sschevybear11 · 02-19-2012, 09:04 AM

Quote:

Originally Posted by IROCanSS

I had 4.10s, they whined, then broke, but thats not why. Wheel hop got them.

Now I have my 3.45s back in and they whine, same speed you describe. I think it has to do with the wear pattern. You can't install used gears and not have them whine.

Bad thing is I've done countless gear swaps and fords will accept used gears and not whine. You have typical gear noise that won't change with pinion or backlash movement.

IROCanSS · 02-19-2012, 09:14 AM

Quote:

Originally Posted by sschevybear11

Bad thing is I've done countless gear swaps and fords will accept used gears and not whine. You have typical gear noise that won't change with pinion or backlash movement.

Right, but I don't really care. I will be swapping out again some day so I just either speed up or slow down when it really starts to get at me.

inferno camaro · 02-19-2012, 10:34 AM

I didn't change the gears, I put in the entire diff that was already setup with these gears? The person I got from did talk about wheel hop issues, so maybe it messed up a bearing or something.

Eric Baker · 02-19-2012, 10:52 AM

It's unlikely that a bearing got damaged from wheel hop but the gears weren't affected.

inferno camaro · 02-19-2012, 05:11 PM

Can the rear be setup again to fix it or is it to late once they have been run. I have read that some people are adjusting them and it works OK but alot off people say I would need to get new ring and pinion. To those who say they can't be adjusted and fix it does that meen the noise won't go away or will it actually hurt the gear? If it would help the gears last even though the noise doesn't go away I would do it. I was told to get them micropolished and them setup again.

flht99b · 02-20-2012, 07:20 AM

LPE 3.70's are made by AAM who makes the entire Camaro diff for GM so they really aren't aftermarket. I have AAM/LPE 3.70's in my car and they are factory quiet.
Ed M.

toml_pa · 02-20-2012, 07:38 AM

I recently had AAM 3.91 gears installed in my diff. Here are the breakin instructions my installer gave me:

The break in is VERY specific.

-Drive 30-35 MPH for 20-30 minutes.
-Drive 55-60 MPH for 20-30 minutes.
-Come to a complete stop and let the diff cool (15 minutes minimum)
This is one cycle. Repeat this cycle 4-5 times. If you don't do this EXACTLY, the diff WILL whine. 500 miles will be needed for a full break in.

Maybe this was not done?

inferno camaro · 02-20-2012, 10:36 AM

Who did the install for you guys? Would be nice to talk to them for advice. I have heard micro polishing may help as it makes a fresh surface. Thinking about doing this, for $50 its worth a try I guess

02-18-2012, 04:57 PM	#1
inferno camaro Drives: 2010 camaro pace car, 2008 cts bl, Join Date: Jun 2011 Location: Indiana Posts: 841	LPE gear noise??? I just installed a stock diff with LPE 3.70 gears in my car, it is supposed to have around 2500 miles on it. It has what sounds like a gear whine at normal highway speeds. If I get over 70 or so the noise seems to quit, or if I'm under 45 it sounds OK. Is this a normal thing with aftermarket gear sets? If I let off the gas it will quit for a couple seconds and then start again[not as loud though] I have only driven it about 5 miles so far. I used royal purple 75/90 lube, would 90/140 help this at all. I also wondered if it could possibly be bearing issues? With 2500 miles I wouldn't think so. __________________ Mods, 2r max cam, ls3 conv,kooks lt w/hf cats,kooks street sleeper cat back with magnaflow res x-pipe, roto fab cai, v-max TB, vigilante 3700 stall, 3.70 LPE, 442hp/392tq, Mike Norris Tune 11.71@116.24 1.63 60' m&h DR's

02-19-2012, 07:37 AM	#2
inferno camaro Drives: 2010 camaro pace car, 2008 cts bl, Join Date: Jun 2011 Location: Indiana Posts: 841	Anybody running aftermarket gears??? __________________ Mods, 2r max cam, ls3 conv,kooks lt w/hf cats,kooks street sleeper cat back with magnaflow res x-pipe, roto fab cai, v-max TB, vigilante 3700 stall, 3.70 LPE, 442hp/392tq, Mike Norris Tune 11.71@116.24 1.63 60' m&h DR's

02-19-2012, 08:54 AM	#5
inferno camaro Drives: 2010 camaro pace car, 2008 cts bl, Join Date: Jun 2011 Location: Indiana Posts: 841	It does have solid bushings in it. I looked at the gears and can't see and wear with the naked eye, but maybe thats not possible. Its not loud just a little annoying. __________________ Mods, 2r max cam, ls3 conv,kooks lt w/hf cats,kooks street sleeper cat back with magnaflow res x-pipe, roto fab cai, v-max TB, vigilante 3700 stall, 3.70 LPE, 442hp/392tq, Mike Norris Tune 11.71@116.24 1.63 60' m&h DR's Last edited by inferno camaro; 02-21-2012 at 04:52 PM.

02-19-2012, 10:34 AM	#8
inferno camaro Drives: 2010 camaro pace car, 2008 cts bl, Join Date: Jun 2011 Location: Indiana Posts: 841	I didn't change the gears, I put in the entire diff that was already setup with these gears? The person I got from did talk about wheel hop issues, so maybe it messed up a bearing or something. __________________ Mods, 2r max cam, ls3 conv,kooks lt w/hf cats,kooks street sleeper cat back with magnaflow res x-pipe, roto fab cai, v-max TB, vigilante 3700 stall, 3.70 LPE, 442hp/392tq, Mike Norris Tune 11.71@116.24 1.63 60' m&h DR's

02-19-2012, 05:11 PM	#10
inferno camaro Drives: 2010 camaro pace car, 2008 cts bl, Join Date: Jun 2011 Location: Indiana Posts: 841	Can the rear be setup again to fix it or is it to late once they have been run. I have read that some people are adjusting them and it works OK but alot off people say I would need to get new ring and pinion. To those who say they can't be adjusted and fix it does that meen the noise won't go away or will it actually hurt the gear? If it would help the gears last even though the noise doesn't go away I would do it. I was told to get them micropolished and them setup again. __________________ Mods, 2r max cam, ls3 conv,kooks lt w/hf cats,kooks street sleeper cat back with magnaflow res x-pipe, roto fab cai, v-max TB, vigilante 3700 stall, 3.70 LPE, 442hp/392tq, Mike Norris Tune 11.71@116.24 1.63 60' m&h DR's

02-19-2012, 08:41 AM	#3
Eric Baker Drives: Black/Black 2SS/RS 6M Join Date: Mar 2010 Location: Boston MA Posts: 987 View My Garage	Yes aftermarket gears will be noisier than factory to some extent, especially if you have aftermarket bushings installed. If they are really loud, they may be damaged or installed incorrectly.

02-19-2012, 08:50 AM	#4
IROCanSS Account Suspended Drives: 89 IROC 350 Join Date: Mar 2009 Location: Back roads, southern Ohio Posts: 12,504 View My Garage	I had 4.10s, they whined, then broke, but thats not why. Wheel hop got them. Now I have my 3.45s back in and they whine, same speed you describe. I think it has to do with the wear pattern. You can't install used gears and not have them whine.

02-19-2012, 10:52 AM	#9
Eric Baker Drives: Black/Black 2SS/RS 6M Join Date: Mar 2010 Location: Boston MA Posts: 987 View My Garage	It's unlikely that a bearing got damaged from wheel hop but the gears weren't affected.

02-20-2012, 07:20 AM	#11
flht99b Drives: 2010 Camaro 2SS/RS RJT Join Date: May 2009 Location: Knoxville Posts: 1,574 View My Garage	LPE 3.70's are made by AAM who makes the entire Camaro diff for GM so they really aren't aftermarket. I have AAM/LPE 3.70's in my car and they are factory quiet. Ed M. __________________ RJT 2SS/RS, AAM 3.70's, MTI Sway Bars, Shifter & SS brake lines, ZLI calipers, rotors & pads, BMR Trailing & Toe Arms, rear cradle & diff bushes, Pedders XA's, Camber/Toe eccentrics, Radius arm inserts, GTO clutch reservoir, LS9 cam, Comp valve springs, Melling 10296 oil pump, CR5 timing chain, LS6 damper, CAI Cold Air Intake, ARH LT headers w/HF cats, GMPP touring axle back, Elite Engineering Catch Can, Forgeline 20x9.5 & 20x11 DS3 whls, 275/40/20 & 315/35/20 tires, 2011 Convertible spoiler, 1LE front spoiler, Lloyd "SS" Floor Mats, GM Camaro Trunk Mat, wrapped console & Grant steering wheel.

02-20-2012, 07:38 AM	#12
toml_pa ʇuɐıʌǝp lɐıɔos Drives: 2011 2SS/RS LS3/M6 Join Date: Feb 2011 Location: Pennsylvania Posts: 231	I recently had AAM 3.91 gears installed in my diff. Here are the breakin instructions my installer gave me: The break in is VERY specific. -Drive 30-35 MPH for 20-30 minutes. -Drive 55-60 MPH for 20-30 minutes. -Come to a complete stop and let the diff cool (15 minutes minimum) This is one cycle. Repeat this cycle 4-5 times. If you don't do this EXACTLY, the diff WILL whine. 500 miles will be needed for a full break in. Maybe this was not done?

02-20-2012, 10:36 AM	#13
inferno camaro Drives: 2010 camaro pace car, 2008 cts bl, Join Date: Jun 2011 Location: Indiana Posts: 841	Who did the install for you guys? Would be nice to talk to them for advice. I have heard micro polishing may help as it makes a fresh surface. Thinking about doing this, for $50 its worth a try I guess __________________ Mods, 2r max cam, ls3 conv,kooks lt w/hf cats,kooks street sleeper cat back with magnaflow res x-pipe, roto fab cai, v-max TB, vigilante 3700 stall, 3.70 LPE, 442hp/392tq, Mike Norris Tune 11.71@116.24 1.63 60' m&h DR's Last edited by inferno camaro; 02-21-2012 at 04:54 PM.

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