Re-shimming backlash ?
Thread Starter
TECH Regular
Joined: Mar 2002
Posts: 433
Likes: 0
Re-shimming backlash ? Guys, I just had Superior 3.73s installed and after about 300 mile break-in period and 4 complete heat cycles I could not help doing some little highway punches. Of course the gears started immediately whining.
I pulled the cover and by eye ( I didn't measure ) it looked to me that the backlash was more that the .010. There was very visible movement and a clunk between p & r. I put in Valvoline 85W140 and it's OK. I'm just afraid that it won't be too long.
The installer did claim that the oil would not even need to be replaced after break-in period...
Anyway, is there any use trying to shim the backlash at this point or is it gonna be new gears soon ? It's been driven about 400 miles.
Pekka
I pulled the cover and by eye ( I didn't measure ) it looked to me that the backlash was more that the .010. There was very visible movement and a clunk between p & r. I put in Valvoline 85W140 and it's OK. I'm just afraid that it won't be too long.
The installer did claim that the oil would not even need to be replaced after break-in period...
Anyway, is there any use trying to shim the backlash at this point or is it gonna be new gears soon ? It's been driven about 400 miles.
Pekka
Re: Re-shimming backlash ? I have mine at .010" too. I was told by Cartek that alittle extra backlash helps with cushioning the shock of the drivetrain and prolongs the life of the gear.
TECH Resident
Joined: Feb 2002
Posts: 992
Likes: 0
From: Schererville, IN
Re: Re-shimming backlash ? Interesting....I was wondering the same thing. I have Richmond 3.73s and after the install I noticed a slight whine, not too bad. After a few launches at the track on ET Streets they got noticably louder, borderline annoying <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
Re: Re-shimming backlash ? I installed a set of Richmond 3.42 with a solid crush sleeve. After about 2500 miles the pinion bearings were slightly loose. I pulled out the solid sleeve and put a new crush sleeve in. I torqued it to a certain amount of drag torque and drove it. It too started quiet and grew whiny. More so on deceleration. In the morning, I am going to inspect the pinion bearings again to see if they any looser. I was also told that Richmond gear sets are noisy, but stronger that most 10-bolt gears. I have yet to launch off the line with drag radials and 150HP shot at 5K. I'll find out tomorrow.
TECH Fanatic
Joined: Jan 2002
Posts: 1,376
Likes: 0
From: Stuart Fl
Re: Re-shimming backlash ? Every set Ive had have been quiet til I start banging gears( M6).Than they all whine . Genuine GM, gm motive, ive heard of more people breaking richmonds than any other gear. Ive had mine set at 8 thou, 10thou, and my last set 3 days ago at 12 thou. They all whine. But im real hard on them !!I replaced the gm motive 3 days ago cause they really sounded bad. Only had like 2k and maybe 40 passes on them. When they came out they looked fine. We checked the lash before removal, and it was still at 10 thou. like it had been installed!!I dont have a rear end girdle and wonder if im flexing the whole housing?? The original 3.42s wre very quiet for 46k and hundreds and hundreds of passes!
Re: Re-shimming backlash ? What gear ratio are you using? I have 3.42 and other have said they less prone to breakage than a 3.73 or 4.10. I also have ARP main bearing cap stud kit and a Summit rearend Girdle. I figure to atleast have something to reduce flex.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Re: Re-shimming backlash ? If they were quiet after the install no bearings failed then I don't see how the backlash changed. Maybe the pinion nut backed out? Installer might have forgotten lock tite. I'm just guessing here. Check for pinion fore-aft movement. I don't think shims would do anything. After all it was quiet after the install so they are correct. I'm guessing it's the pinion moving.
I've been beating on my 4.10s like there is no tomorrow. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> They dare to whine I'll kill them.
I've been beating on my 4.10s like there is no tomorrow. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> They dare to whine I'll kill them.
