|
05-19-2016, 07:30 AM | #1 |
Member
Join Date: Dec 2001
Location: Ontario Canada
Posts: 358
Likes: 101
Liked 6 Times in 4 Posts
|
rear end noise
almost new 4.10 installed in a 12 bolt , noisy when coasting, would this be set up or is it normal ?
|
05-19-2016, 07:44 AM | #2 |
Senior Member
Join Date: Feb 2010
Posts: 504
Likes: 7
Liked 352 Times in 82 Posts
|
Re: rear end noise
"Almost new" means they've been set up before and ran for some period of time with that relationship between the ring gear and pinion. They "got used to each other" during that time, and unless you can re-set them to exactly that relationship (and you can't), they will howl. Also, drag race gearsets tend to be set-up for deeper tooth engagement (for durability) and that seldom means a perfect, quiet contact pattern.
Last edited by nhramnl; 05-19-2016 at 07:47 AM. |
05-19-2016, 08:39 AM | #3 |
VIP Member
Join Date: Jul 2008
Location: Liberty City [East Texas]
Posts: 1,759
Likes: 5
Liked 99 Times in 60 Posts
|
Re: rear end noise
I like the Chevy 12 bolt. I have installed the 12 bolt housing in a number of drag race buildups. In addition, I have installed many gear sets on both street and race packages.
My experience, about 4.10 and lower, because the pinion becomes smaller and smaller, it is a matter of mechanical tooth contact that the gear set will have some noise. The steeper the ratio, the more noise. Another bit of experience, for ratios lower than 5.38, the 12 bolt is not the best choice. A Dana 60 or 9" is a better choice for the steep ratios.
__________________
Larry Woodfin 471W |
05-19-2016, 09:57 AM | #4 |
VIP Member
Join Date: Nov 2008
Location: Glendora,Calif.
Posts: 1,111
Likes: 164
Liked 649 Times in 208 Posts
|
Re: rear end noise
Mike-What was your pinion shim thickness and what was your final backlash? Also, used means that a wear pattern has been already established,but how long was it used previously ?Adjusting it a bit and changing the pattern might or might not improve things.
|
05-19-2016, 08:26 PM | #5 |
Member
Join Date: Dec 2001
Location: Ontario Canada
Posts: 358
Likes: 101
Liked 6 Times in 4 Posts
|
Re: rear end noise
.023 pinion and .008 backlash . The gears were in a street car for no very Long
|
05-19-2016, 11:12 PM | #6 |
VIP Member
Join Date: Nov 2008
Location: Glendora,Calif.
Posts: 1,111
Likes: 164
Liked 649 Times in 208 Posts
|
Re: rear end noise
That pinion shim sounds a bit too thin.Try a 030" pinion, .008-.010 on the BL is about right.
|
|
|