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V8 and V6 Transmissions / Driveline (6L80 / 6L50 / TR6060 / AY6) Driveshafts | Differentials | Gears | Rearends | Clutch | Shifters

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Old 03-23-2014, 09:40 PM   #1
rmilcic
 
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Gear Swap to 3.91 on a 2013 Camaro 2ss/rs

Guys,

Need some advice. I just pulled my diff and sent it to a shop to swap out the 3.45 to 3.91 ring and pinion. While it was there I also had them press in harder carrier diff mounts. I put the diff back in myself. (Pretty easy job)

So my issue:

When the can is in first gear and I have the clutch pressed in and i start to release the clutch i hear a whap, whap whap sound from the rear end. At least it sounds like its the rear end. Are the harder bushing causing this? Due to less flex in the rear end? Should I put harder bushing in the transmission now? Really frustrated here any advice or help would be greatly appreciated.
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Old 03-24-2014, 05:13 PM   #2
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pulled Diff again today. Taking it back to my Tranny/Diff guy. I'll keep ya posted.
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Old 03-25-2014, 09:29 PM   #3
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Looks like the backlash was set to .10 and GM spec is .002 - .005 My Trans/Diff guy is currently making the changes to the backlash. He was surprised by the GM spec being set so tight. I should get the diff back tomorrow so I can throw it back in and test.

Im also holding off removing the after market diff carrier bushings. I hope this takes the slop/clunk out of the rear end..
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Old 03-26-2014, 12:13 PM   #4
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The stiffer rear bushings seem to make all of the nosies and clunking come out more, mine does the same thing and I'm sure there are a lot of others that complain about the same issue.
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Old 03-26-2014, 12:58 PM   #5
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Yea it was bad.. I understand more vibration and i'm willing to accept that, This was during start off or when I pushed the clutch back in drifting at slow speeds like below 5 mph. It was a horrible sound coming from the diff. Took it back to the tranny\diff guy and he is adjusting the backlash to the gm SPEC, between .002-.005 I hope this tightens things up and gets rid of some/most of the slop in the rear end.

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The stiffer rear bushings seem to make all of the nosies and clunking come out more, mine does the same thing and I'm sure there are a lot of others that complain about the same issue.
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Old 03-26-2014, 01:46 PM   #6
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Originally Posted by rmilcic View Post
Yea it was bad.. I understand more vibration and i'm willing to accept that, This was during start off or when I pushed the clutch back in drifting at slow speeds like below 5 mph. It was a horrible sound coming from the diff. Took it back to the tranny\diff guy and he is adjusting the backlash to the gm SPEC, between .002-.005 I hope this tightens things up and gets rid of some/most of the slop in the rear end.
Can you do me a favor ? Could you check the looseness you have in your transmission while it's in 6th gear. I'm trying to see if this is normal, or not... Maybe the slop you're feeling is from this ... http://www.camaro5.com/forums/showpo...22&postcount=1
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Old 03-26-2014, 02:10 PM   #7
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No problem, when I get home from work ill throw the car in 6th gear on my lift and try.. Only thing is my car is fine once it gets moving. In every gear. So not sure how much help this will be for you.

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Can you do me a favor ? Could you check the looseness you have in your transmission while it's in 6th gear. I'm trying to see if this is normal, or not... Maybe the slop you're feeling is from this ... http://www.camaro5.com/forums/showpo...22&postcount=1
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Old 03-26-2014, 02:33 PM   #8
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No problem, when I get home from work ill throw the car in 6th gear on my lift and try.. Only thing is my car is fine once it gets moving. In every gear. So not sure how much help this will be for you.
Thank you
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Old 03-26-2014, 05:42 PM   #9
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So my camaro on my lift i put the car in 6th gear and attempted to turn just the drive shaft by hand and it turned but it was very tight (hard to turn). Hope this helps. And I haven't got my diff with the backlash adjusted to GM spec back yet. But I will keep you posted once I do. Posted a pic also, mostly just to show off my garage. lol That I love!

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Thank you
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Old 03-26-2014, 06:33 PM   #10
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Originally Posted by rmilcic View Post
So my camaro on my lift i put the car in 6th gear and attempted to turn just the drive shaft by hand and it turned but it was very tight (hard to turn). Hope this helps. And I haven't got my diff with the backlash adjusted to GM spec back yet. But I will keep you posted once I do. Posted a pic also, mostly just to show off my garage. lol That I love!
Thank you so much ... Did it turn as much as my video, or was it a minor rotation ?

Hopefully your backlash adjustment will resolve your slop condition !! It's amazing how a few thousands of an inch can cause problems.

That is one GREAT garage I wish I had space in mine to add a lift... Maybe the next house !!
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Old 03-26-2014, 07:30 PM   #11
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My 6th gear turn was about the same as your video. . I will keep you posted on my progress. My diff should be done tomorrow. Again hope this helps

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Originally Posted by camarorick View Post
Thank you so much ... Did it turn as much as my video, or was it a minor rotation ?

Hopefully your backlash adjustment will resolve your slop condition !! It's amazing how a few thousands of an inch can cause problems.

That is one GREAT garage I wish I had space in mine to add a lift... Maybe the next house !!
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Old 03-28-2014, 10:34 PM   #12
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Well, got the diff back today with the back lash set too .003, and in the car. It pulls like a freight train, but still have that little knock in first when the clutch engages just from a slow start. Not sure what the deal is but Im going try removing the energy diff carrier bushings i purchased and put the stock ones back in.
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Old 03-29-2014, 02:01 PM   #13
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So back lash has been adjusted to .003 and the slapping sound in the rear when i need to move the car forward a few feet and I push the clutch back in has got a lot better but I can still hear/feel it. Instead of going back to the stock diff bushings I may buy BMR rear diff carrier bushings. What do you guys think?? Right now Im running some off market brand of harder rear diff bushings.
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Old 04-01-2014, 06:52 PM   #14
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Knock after the 3.91 upgrade video. Car on the lift..

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Old 04-01-2014, 07:16 PM   #15
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Unless there is slop in the current bushing replacing them won't do anything. Going to an even harder bushing will only make it more noticeable. My energy suspension bushings were quiet as a mouse so I don't think thats it. I had a clunk fully stock but have not heard it since replacing the driveshaft. It didn't make the noise multiple times in a row though which would make me think bearing or axle seating. Did they replace any of the bearings when doing the gears?
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Old 04-01-2014, 07:17 PM   #16
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It almost sounds like a bolt on the driveshaft is hitting something when things move during a shift. Hows your clearance with exhaust and everything else?
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Old 04-01-2014, 11:35 PM   #17
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Sorry for my loud voice as the exhaust was off from the cat back in the video's.

Diff knock with exhaust removed by hand:



Diff knock with exhaust remove with car running on lift:

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