Rear end gear break in ???? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

converted · 05-16-2013, 11:32 AM

We are trying to decide on doing the 391 gear swap in our car. Gonna send it off and have cam and gears done at same time. The shop i am using is going to just replace the rear end with a new unit loaded with the 391's. my question is do you have to do the whole break in thing of several heat cycles with a built unit like i have read others do when they have just replaced the gears?? Any help or info would be appreciated. The shop we are using is 500 miles from home and if i have to kill off 2-3 days breaking in my mew gears i may decide to just do the cam. Thanks.

ravensjeff · 05-16-2013, 11:58 AM

Lingenfelter put new 3.70 in mine and I drove it 600 miles home with no issues. They did say to try and not stay at one speed for too long, and not very high speeds to begin with, but I thought that was more for the engine (Which was forged internally amongst other items).

The shop doing the work should be able to answer your question.

converted · 05-16-2013, 12:04 PM

Quote:

Originally Posted by ravensjeff

Lingenfelter put new 3.70 in mine and I drove it 600 miles home with no issues. They did say to try and not stay at one speed for too long, and not very high speeds to begin with, but I thought that was more for the engine (Which was forged internally amongst other items).

The shop doing the work should be able to answer your question.

Thats kinda what i was thinking speed limit and no hard acceleration we dont smoke in our car so when we travel we do take frequent breaks so it would have several chances to cool off some atleast. Then by the time we make it home all should be well. Thanks for the reply.

Rock-It Man · 05-16-2013, 12:11 PM

Actually, break in is more for the gears than for the engine. Vary speed and stay away from WOT for the break in period.

vroomapunk · 05-16-2013, 01:02 PM

Vary the speed so one part doesnt get worn more than the other. No cruise control

E.T. · 05-16-2013, 01:11 PM

I read about a whole involved procedure, but it seemed like overkill. The shop that installed mine just said go easy on her for a little while. That's what I did, and I haven't had any problems. The real hard part is resisting the urge to smash that go pedal!

BubbaSS · 05-16-2013, 02:49 PM

You definitely want to break in those gears properly...Then manufacturer website should have step by step instructions...You'll want to turn the radio off and listen for noises as well.

converted · 05-16-2013, 03:14 PM

Quote:

Originally Posted by BubbaSS

You definitely want to break in those gears properly...Then manufacturer website should have step by step instructions...You'll want to turn the radio off and listen for noises as well.

Thats a good point i think it will be an rx brand diff. So ill try and check with them as well

E.T. · 05-16-2013, 09:39 PM

I'm not sure why there's such an elaborate procedure for breaking in gears. The car comes from the factory with brand new gears, right? You don't have to follow any special procedures when leaving the car lot, except the usual break-in stuff.

I found this in an old thread:

Quote:

Originally Posted by toml_pa

This is what my installer gave me. Also said to change oil after 500 miles.

AAM 3.91 Gear Break In Procedure

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.

That would take a loooong time. AAM makes the stock gears, so why don't you have to follow this procedure when breaking in a stock car?

I'm not an expert on this, but I didn't follow this procedure, and my gears are peachy.

converted · 05-16-2013, 10:00 PM

Quote:

Originally Posted by E.T.

I'm not sure why there's such an elaborate procedure for breaking in gears. The car comes from the factory with brand new gears, right? You don't have to follow any special procedures when leaving the car lot, except the usual break-in stuff.

I found this in an old thread:

That would take a loooong time. AAM makes the stock gears, so why don't you have to follow this procedure when breaking in a stock car?

I'm not an expert on this, but I didn't follow this procedure, and my gears are peachy.

Thats also what i thought why break these in any different than a new car?

BubbaSS · 05-16-2013, 10:52 PM

Here's some good info on the importance of breaking in new gears:

http://www.ringpinion.com/technicalh...r_Break-In.inc

I know it specifies trucks but the reason for break in is the same

jph2275 · 05-16-2013, 11:31 PM

Took my 1le gears somewhat easy first 500 miles. I slam on them all the time now. No whine, just great acceleration.

bucketobolts · 05-17-2013, 03:40 PM

Did you break in the factory gears? If they are set up properly, don't worry and drive it.

denooo11 · 06-22-2013, 03:41 PM

I had the 1LE gears installed from a friend who does truck gears. I installed a JRE posi upgrade kit with billet end caps. After 100 miles I pushed it hard in the first three gears and the rear sounds great with no noise and no problems.

05-16-2013, 11:32 AM	#1
converted Drives: 2012 45th anniversary Join Date: Apr 2012 Location: Currently in Corpus Christi Texas Posts: 363	Rear end gear break in ???? We are trying to decide on doing the 391 gear swap in our car. Gonna send it off and have cam and gears done at same time. The shop i am using is going to just replace the rear end with a new unit loaded with the 391's. my question is do you have to do the whole break in thing of several heat cycles with a built unit like i have read others do when they have just replaced the gears?? Any help or info would be appreciated. The shop we are using is 500 miles from home and if i have to kill off 2-3 days breaking in my mew gears i may decide to just do the cam. Thanks.

05-16-2013, 11:58 AM	#2
ravensjeff 100% Chevy & Harley Man Drives: 2010 2SS: Blown LSX 376-B15 Join Date: Feb 2009 Location: Eldersburg,MD Posts: 2,211 View My Garage	Lingenfelter put new 3.70 in mine and I drove it 600 miles home with no issues. They did say to try and not stay at one speed for too long, and not very high speeds to begin with, but I thought that was more for the engine (Which was forged internally amongst other items). The shop doing the work should be able to answer your question. __________________ LSX 376-B15, TVS2300 SC, Harland Sharp Rockers w/ Trunion Bearings, ATI Balancer/keyed, AR LT Headers/Borla Catback Exhaust, DSS 1400 HP Axles, DSS aluminum driveshaft, 3.70, Hotchkis Springs/Sway bars, Forgeline SO3P Aluminum Wheels (20x9.5 F/20x11 R)w/ Hidden Titanium Hardware, Nitto NT05 Tires (27540ZR20 F/31535ZR20 R), Billet LPE brake/gas pedals, Escort 9500ci Radar Detector Laser Jammer, Roto Fab CAI with Ice Silver box, Carbon fiber tube/MAF Housing Assy, LPE Aluminum coil covers, SS9 Sleeper Fiber Glass Hood (ACS), Carbotech 1521 ceramic brake pads, Elite catch can.

05-16-2013, 01:02 PM	#5
vroomapunk [COTW 5/12/14] Drives: 2012 CRT NF Cammed 2SS/RS For Sale Join Date: Oct 2011 Location: NOLA Posts: 6,115 View My Garage	Vary the speed so one part doesnt get worn more than the other. No cruise control __________________

05-16-2013, 01:11 PM	#6
E.T. Drives: 2012 Camaro 2SS/RS Join Date: Jul 2010 Location: Cleveland, OH Posts: 3,267	I read about a whole involved procedure, but it seemed like overkill. The shop that installed mine just said go easy on her for a little while. That's what I did, and I haven't had any problems. The real hard part is resisting the urge to smash that go pedal! __________________

05-16-2013, 02:49 PM	#7
BubbaSS WHAT RED LIGHT?! Drives: 2011 Black Camaro 2SS/RS M6 Join Date: Apr 2011 Location: Miami, Florida Posts: 1,115	You definitely want to break in those gears properly...Then manufacturer website should have step by step instructions...You'll want to turn the radio off and listen for noises as well. __________________ 2011 2SS/RS M6 BLACK - VARARAM NO TUNE INTAKE, MODDED AND PORTED TB, PORTED INTAKE MANIFOLD, VITESSE THROTTLE CONTROLLER, DOUG THORLEY LT'S, CATLESS, X-PIPE, 25" STAINLESS WORKS RETRO CHAMBERED MUFFLERS, CUSTOM 2.5" MANDREL BENT EXHAUST, RICHMOND 4.10 GEARS, CUSTOM CAM (231/242 @ 114LSA), MUSTANG DYNO TUNED BY TORQ, 20% CERAMIC TINTS, EIBACH PROKIT SPRINGS 1" DROP, HAWK PERFORMANCE CERAMIC BRAKES, NITTO INVO TIRES, HYDROCARBON TAIL LIGHT AND FOG LIGHT BEZELS BY EMBLEMPROS, METRA DASH KIT, JVC KW-AV71BT, PHOENIX GOLD iAMP GM1, PASSPORT QI45 - 450 RWHP 415 RWTQ

05-16-2013, 12:11 PM	#4
Rock-It Man 376 cubic inches of fun Drives: 2023 Camaro ZL1 A10 Join Date: Jul 2010 Location: MA Posts: 4,033 View My Garage	Actually, break in is more for the gears than for the engine. Vary speed and stay away from WOT for the break in period.

05-16-2013, 10:52 PM	#11
BubbaSS WHAT RED LIGHT?! Drives: 2011 Black Camaro 2SS/RS M6 Join Date: Apr 2011 Location: Miami, Florida Posts: 1,115	Here's some good info on the importance of breaking in new gears: http://www.ringpinion.com/technicalh...r_Break-In.inc I know it specifies trucks but the reason for break in is the same __________________ 2011 2SS/RS M6 BLACK - VARARAM NO TUNE INTAKE, MODDED AND PORTED TB, PORTED INTAKE MANIFOLD, VITESSE THROTTLE CONTROLLER, DOUG THORLEY LT'S, CATLESS, X-PIPE, 25" STAINLESS WORKS RETRO CHAMBERED MUFFLERS, CUSTOM 2.5" MANDREL BENT EXHAUST, RICHMOND 4.10 GEARS, CUSTOM CAM (231/242 @ 114LSA), MUSTANG DYNO TUNED BY TORQ, 20% CERAMIC TINTS, EIBACH PROKIT SPRINGS 1" DROP, HAWK PERFORMANCE CERAMIC BRAKES, NITTO INVO TIRES, HYDROCARBON TAIL LIGHT AND FOG LIGHT BEZELS BY EMBLEMPROS, METRA DASH KIT, JVC KW-AV71BT, PHOENIX GOLD iAMP GM1, PASSPORT QI45 - 450 RWHP 415 RWTQ

05-17-2013, 03:40 PM	#13
bucketobolts Drives: 2010 2SS Join Date: Jan 2011 Location: Salisbury, NC Posts: 149	Did you break in the factory gears? If they are set up properly, don't worry and drive it.

06-22-2013, 03:41 PM	#14
denooo11 Dean Voss Drives: 2010 Camaro SS Join Date: Oct 2009 Location: Brick NJ Posts: 88 View My Garage	1LE 391 gears I had the 1LE gears installed from a friend who does truck gears. I installed a JRE posi upgrade kit with billet end caps. After 100 miles I pushed it hard in the first three gears and the rear sounds great with no noise and no problems.