Drivetrain clunk after diff bushing - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

taz1727 · 12-02-2020, 08:40 AM

Hey guys I swapped in a z/28 diff with hendricks offset bushing. When I go to shift I feel/hear a clunk, its not consistent but on a 1-2 I get it almost every time, 4th gear and above it goes away. Other threads have mentioned the diff bushings exaggerate our infamous drivetrain slack. Interested in what others have experienced and know abut this, thanks.

flht99b · 12-02-2020, 09:38 AM

Yes, responded to your previous post "clunky gear engagement" a few minutes ago.

Avenging Orange · 12-02-2020, 01:41 PM

Same here after BMR diff bushings.

taz1727 · 12-02-2020, 01:53 PM

Quote:

Originally Posted by Avenging Orange

Same here after BMR diff bushings.

Did you do anything to improve it or just lived with it?

brick59 · 12-02-2020, 02:49 PM

I'm using BMR delrin diff bushings and solid cradle bushing I get the clunk, we put the car on a drive on lift to check it out and it turns out to be the ring and pinion back lash, when you take out all the rubber bushings and mount everything solid it transfers a lot of noise that would be absorb by the rubber bushings.

taz1727 · 12-02-2020, 03:03 PM

Quote:

Originally Posted by brick59

I'm using BMR delrin diff bushings and solid cradle bushing I get the clunk, we put the car on a drive on lift to check it out and it turns out to be the ring and pinion back lash, when you take out all the rubber bushings and mount everything solid it transfers a lot of noise that would be absorb by the rubber bushings.

I have Delrin cradle bushings as well so definitely more noise. On a different thread someone recommended I open it up and check the backlash as well. Did you correct the ring & pinion to the proper tolerance and it went away? Or just a byproduct of the bushings?

brick59 · 12-02-2020, 04:49 PM

When I did the 4L80 conversion I also changed the rear gears to 3.73s and set the backlash to .006 to .008. also I checked the backlash on the 3.23s before I removed them and they were at .010 I think the manual says max is .012. after the convertion I had about the same clunk, also when I did the convertion I went with a one pc. chromoly drive shaft so that probably not helping my situation any.

RankSS · 12-02-2020, 05:48 PM

I have the delrin offsets with my ZL1 diff and you can hear the lash. It gets even more amplified with the aluminum one piece driveshaft.
This noise is what it is and has not gotten any worse after many beatings.

taz1727 · 12-03-2020, 06:55 AM

Quote:

Originally Posted by brick59

When I did the 4L80 conversion I also changed the rear gears to 3.73s and set the backlash to .006 to .008. also I checked the backlash on the 3.23s before I removed them and they were at .010 I think the manual says max is .012. after the convertion I had about the same clunk, also when I did the convertion I went with a one pc. chromoly drive shaft so that probably not helping my situation any.

Quote:

Originally Posted by RankSS

I have the delrin offsets with my ZL1 diff and you can hear the lash. It gets even more amplified with the aluminum one piece driveshaft.
This noise is what it is and has not gotten any worse after many beatings.

Haha well dam, I want to say I'm a bit relieved. I'm going to check my backlash anyway just to be safe. Seems like the alternative is to go back to stock diff bushings or try with a softer poly. Thanks guys, very helpful!

Avenging Orange · 12-03-2020, 10:10 AM

Quote:

Originally Posted by taz1727

Did you do anything to improve it or just lived with it?

It was an expected result of adding diff & cradle bushings...so I accept it. You are also likely to experience a little gear whine as well.

taz1727 · 12-03-2020, 11:26 AM

Quote:

Originally Posted by Avenging Orange

It was an expected result of adding diff & cradle bushings...so I accept it. You are also likely to experience a little gear whine as well.

I picked up on a small whine last night but that doesn't bother me at all. Thanks!

rdavis · 12-20-2020, 08:20 AM

I had the hard bushings in my differential for about a week. Couldn't stand it. Ended up going with BMR "street" bushings. Still much better than stock & took 75% of the clunk out of it.

12-02-2020, 08:40 AM	#1
taz1727 Drives: 13 Camaro 2SS/RS LS3 Join Date: May 2020 Location: Miami Posts: 104	Drivetrain clunk after diff bushing Hey guys I swapped in a z/28 diff with hendricks offset bushing. When I go to shift I feel/hear a clunk, its not consistent but on a 1-2 I get it almost every time, 4th gear and above it goes away. Other threads have mentioned the diff bushings exaggerate our infamous drivetrain slack. Interested in what others have experienced and know abut this, thanks. __________________ K&N Intake/ Pray Ported TB/ GPI Rod-Mod Intake Manifold/ GPI Ported Heads/ GPI SS3 Cam/ TSP 1-7/8" LTH to NPP/ Z/28 Diff/ Hendrix Offset Bushings/ BMR Delrin Cradle Bushings/ Pedders 27/32mm Sway Bars/ 1LE Shocks & Struts/ BMR 1.25 Springs/ Mishimoto Catch Can

12-02-2020, 09:38 AM	#2
flht99b Drives: 2010 Camaro 2SS/RS RJT Join Date: May 2009 Location: Knoxville Posts: 1,574 View My Garage	Yes, responded to your previous post "clunky gear engagement" a few minutes ago. __________________ 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.

12-02-2020, 01:41 PM	#3
Avenging Orange Drives: 2010 Inferno Orange 2SS/RS Join Date: Apr 2010 Location: Clermont, IN Posts: 3,297	Same here after BMR diff bushings. __________________ 2010 Inferno Orange 2SS/RS M6 Black Leather, Sun Roof, OBX Headers, Borla touring axle back, Cold Air Inductions CAI , non synthetic fluids, BMR total bushing upgrade/1" lowering springs, DSE 32mm rear sway bar. GM fe4 shocks/struts/LCA's, AAM 3.91 diff, Vertini RFS1.8 20x9 +30. Conti ExtremeContact Sport 275/35/20. sjm autoprod ABL dash kit. Mike Norris tuned 413/419. Avenging Orange: 43 years of not buying into the Hype........and damn proud of it!! https://youtu.be/9JD9it6SmB8 https://youtu.be/xmelTlEzI34 KICKING CANCERS ASS SINCE 2015!!

12-02-2020, 02:49 PM	#5
brick59 Sucker Punch Drives: 2013 Black ZL1, 2007 Silverado LTZ Join Date: Jul 2014 Location: N.E. Ohio Posts: 275	I'm using BMR delrin diff bushings and solid cradle bushing I get the clunk, we put the car on a drive on lift to check it out and it turns out to be the ring and pinion back lash, when you take out all the rubber bushings and mount everything solid it transfers a lot of noise that would be absorb by the rubber bushings. __________________ 427 Dart SHP Pro LS Block, Callies Magnum Crank, Callies Ultra I Beam Rods, Diamond Pistons, AGP twin Turbos 6865, Mast heads, Cam Motion LLR cam, Morel tie bar lifters, Crower roller rockers, NW 103MM TB, ID2600 XDS, Fore Triple, DSX, E85, ARH Turbo Headers, Corsa, Jakes stage 5 4L80, Circle D, RPM Roll Bar, BMR, Carlyle Racing 15" conversion kit.

12-02-2020, 04:49 PM	#7
brick59 Sucker Punch Drives: 2013 Black ZL1, 2007 Silverado LTZ Join Date: Jul 2014 Location: N.E. Ohio Posts: 275	When I did the 4L80 conversion I also changed the rear gears to 3.73s and set the backlash to .006 to .008. also I checked the backlash on the 3.23s before I removed them and they were at .010 I think the manual says max is .012. after the convertion I had about the same clunk, also when I did the convertion I went with a one pc. chromoly drive shaft so that probably not helping my situation any. __________________ 427 Dart SHP Pro LS Block, Callies Magnum Crank, Callies Ultra I Beam Rods, Diamond Pistons, AGP twin Turbos 6865, Mast heads, Cam Motion LLR cam, Morel tie bar lifters, Crower roller rockers, NW 103MM TB, ID2600 XDS, Fore Triple, DSX, E85, ARH Turbo Headers, Corsa, Jakes stage 5 4L80, Circle D, RPM Roll Bar, BMR, Carlyle Racing 15" conversion kit.

12-02-2020, 05:48 PM	#8
RankSS Drives: 2010 Camaro SS Join Date: Oct 2013 Location: Saskatoon SK Can. Eh Posts: 365	I have the delrin offsets with my ZL1 diff and you can hear the lash. It gets even more amplified with the aluminum one piece driveshaft. This noise is what it is and has not gotten any worse after many beatings. __________________ 2010 Camaro SS RS, Maggie with 3.4" pulley, 60# injectors, ADM dual fuel pumps, ADM Stage 2 Cam with Brian Tooley springs and pushrods, black CAI intake, Stainless Works long tube headers w/gutted cats, ZL1 Diff w/offset bushings, Pfadt lowering springs, Pfadt sway bars, Pfadt solid sub frame mounts, BMR trailing arms and toe rods, Hurst short throw shifter, Painted on Hugger Orange stripes, Forgestar F14 Piano Black wheels, Nitto NT05 rubber.

12-20-2020, 08:20 AM	#12
rdavis Drives: 2012 SS Join Date: Feb 2016 Location: Lubbock Texas Posts: 121	I had the hard bushings in my differential for about a week. Couldn't stand it. Ended up going with BMR "street" bushings. Still much better than stock & took 75% of the clunk out of it. __________________ 2012 2SS/RS 6speed, Howards asa cam on 113lsa Stainless works LT's, NPP exhaust, Z28 Cai, 3.91 gears. Tuned by Blue Thunder 2 racing Lubbock Texas.