Rear end advice.
Thread Starter
Joined: Jul 2005
Posts: 5,898
Likes: 255
From: Ft. Wayne, IN
Rear end advice. My 10 bolt is starting to whine above 90 mph but is still quiet below those speeds(pinion bearing?). It has held up pretty damn well to be honest. I have looked at different rear end options for a long time and can never decide which way to go. I really don't want to add weight to the car. It's a fairly light weight 1sc coupe/hard top(33xxlbs), heads/cam/intake, A4 car.
I don't track the car, but I do launch it frequently on the street. I have considered just rebuilding the 10bolt for 500.00 but there is a good chance this car is going to get a increase in power at some point. The Hawks 8.8 appeals to me for this application but it seems pricey for what it is. S60 is a tank and bullet proof, but seems overkill for my application. Strange 12 bolt seems like a good middle ground, but I don't want to end up with a rear that whines like my kids. I also considered a Moser 9" but don't want to deal with the tq arm hitting the tunnel. MWC Fab 9" looks ultimate, but I already have the BMR adjustable tq/arm with relocation trans cross member. I guess I could sell that stuff.
Thoughts?
I don't track the car, but I do launch it frequently on the street. I have considered just rebuilding the 10bolt for 500.00 but there is a good chance this car is going to get a increase in power at some point. The Hawks 8.8 appeals to me for this application but it seems pricey for what it is. S60 is a tank and bullet proof, but seems overkill for my application. Strange 12 bolt seems like a good middle ground, but I don't want to end up with a rear that whines like my kids. I also considered a Moser 9" but don't want to deal with the tq arm hitting the tunnel. MWC Fab 9" looks ultimate, but I already have the BMR adjustable tq/arm with relocation trans cross member. I guess I could sell that stuff.
Thoughts?
If it were me I'd do the Strange 12 bolt as long as you aren't adding tons of power at some point. In fact this is the rear I really want, but being a M6 I just don't think it's a solid choice for me
Thread Starter
Joined: Jul 2005
Posts: 5,898
Likes: 255
From: Ft. Wayne, IN
Yea I like that idea...I just don't want to end up with it whining but odds are good it wont with the A4 slushmatic. Power increase wont be huge...maybe another 150hp. Drivetrain upgrade is main priority. A4, drive shaft, and rear needs upgraded.
Last edited by kinglt-1; Mar 24, 2018 at 05:13 PM.
The Moser 9 inch typically has two locations where the torque arm will rub the floor. All you have to do to give to give the floor enough clearance is to shove a pry bar between the floor and torque arm and pry the floor up. It doesn't take much effort to do this and you'll never see this inside the car.
The Moser M9, which is Moser's fabricated 9 inch, does not have these contact problems between the torque arm and the floor. This problem only occurs with the standard Moser 9 inch, and it is easily dealt with. Bob
The Moser M9, which is Moser's fabricated 9 inch, does not have these contact problems between the torque arm and the floor. This problem only occurs with the standard Moser 9 inch, and it is easily dealt with. Bob
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PM's disabled, please e-mail me
E-mail: brutespeed@gmail.comob@brutespeed.com
https://brutespeed.com/ Link to website
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Thread Starter
Joined: Jul 2005
Posts: 5,898
Likes: 255
From: Ft. Wayne, IN
Thanks Bob...however I am not real impressed with Moser's quality as of late. My Dad has been dealing with them for years. The last go around was a freshened up 8.5" 10bolt for a 85 Monte SS. He took it down to Moser and had them upgrade it. Got it back, first thing we noticed was the Trutrac diff had a Taiwan sticker on it and the axles were bent. So he had to pull it apart and take the axles back down there and swap them. They do have good service and took care of the issue so I am not opposed to going with a Moser especially since they are local.
Yea that seems to be the consensus these days. However 10 years ago it was folks constantly complaining about 12 bolts whining. Makes me wonder if it was the type of gears more so then the rear itself. My brother has a Moser 9" in his 96 Z28 and it whines a little, but not bad.
I plan on running a 3.73. My 10 bolt has a T/A cover, Torsen T2R diff, and Motive 3.73 gears now(already done when I bought the car back in 2009). It has held up pretty darn well... Why would you lean towards MWC for running a taller gear then a 3.54?
I plan on running a 3.73. My 10 bolt has a T/A cover, Torsen T2R diff, and Motive 3.73 gears now(already done when I bought the car back in 2009). It has held up pretty darn well... Why would you lean towards MWC for running a taller gear then a 3.54?
Last edited by kinglt-1; Mar 25, 2018 at 09:04 AM.
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Verdad Gallardo I've read many many times that the quality of the Strange rear ends is generally better than Moser. I'm not saying it's 100% fact, but i've heard it over and over again.
OP, what's also nice about the 12 bolt is that it draws less power than a S60 or 9 inch. It's also the lightest of the 3 unless you do a fab 9, but that is quite a bit more money as well. You probably know most of this, but just wanted to throw it out there just in case
OP, what's also nice about the 12 bolt is that it draws less power than a S60 or 9 inch. It's also the lightest of the 3 unless you do a fab 9, but that is quite a bit more money as well. You probably know most of this, but just wanted to throw it out there just in case
Thread Starter
Joined: Jul 2005
Posts: 5,898
Likes: 255
From: Ft. Wayne, IN
Appreciate the feedback. I think I am down to either a strange 12 or Fab 9. At least I have narrowed it down some. Been going back and fourth on this too long. Lol
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
I went with a strange 12 bolt, after the first 1.5 60ft it picked up a little whine but never got worse after that even with continued beatings. I recently did a Moser 9 inch for a friend with aluminum center and TA clearance really wasnt an issue, but it was a little heavy but built nice.
They just seem to have the best all in one package for a rear with the torque arm choices. That and if you ever wanted to mess with FI. My car is gonna stay N/A and I doubt i'll ever go as far as your build. I've messaged a few S60 owners on here and they love it. That's just where i'm basing my opinion off of.
TECH Enthusiast
Joined: Jun 2013
Posts: 513
Likes: 1
From: Moose Jaw SK, Canada
Do whatever is in your budget.
If you can sell your torque arm for an alright price the fab 9" are really nice. If you're convinced that you're staying lower horsepower, it's likely overkill.
S60s are pigs but great quality
12 bolts are far more solid than many people make them out to be, and they aren't too heavy.
Judging my opinion on ls1tech threads only, strange is the way to go for the 12 bolts, superior torque arm mount, less complaining about noisiness from the factory.
Many options as you know, lol. Best of luck
If you can sell your torque arm for an alright price the fab 9" are really nice. If you're convinced that you're staying lower horsepower, it's likely overkill.
S60s are pigs but great quality
12 bolts are far more solid than many people make them out to be, and they aren't too heavy.
Judging my opinion on ls1tech threads only, strange is the way to go for the 12 bolts, superior torque arm mount, less complaining about noisiness from the factory.
Many options as you know, lol. Best of luck
Thread Starter
Joined: Jul 2005
Posts: 5,898
Likes: 255
From: Ft. Wayne, IN
Appreciate the feedback guys! There has been a turn of events recently. I had a buddy over at the shop yesterday hanging out and he randomly pulled out a stack of cash to buy my car. So it might be sold...told him I needed a day or two to think about it. I was caught off guard and not expecting it at all. lol
TECH Fanatic
Joined: Jun 2003
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Just my opinion but a lot of the whine is from the torque arm and attachments rather than the rear end.
My 1998 ProCharedCamaro never whined until I installed a Spohn Tunnel mount torque arm. Going from the stock 10 bolt to a Moser with 3.37 gears increased the whine so sold it went back to a ten bolt with 3.23 motive gears and solid pinion spacer with LPW upgrades. Hindsight tells me I should have also had the tubes welded also, but couldn't find a welder I could trust that might create more trouble with bad welds.
My Camaro is lowered with Sam Strano springs but even with a BFH to create additional clearance the torque arm bracket on the Moser it still almost punched a hole in the floor pan
With my auto and since I rarely street race or go to the strip I think I'll be fine at my rwhp level (565 ).
I removed and sold the Spohn torque arm and installed a BMR TA013 tunnel mount kit. That kit got rid of the clunking but not all of the whine. Whine now is some at certain speeds but still not the same as with the stock TA. The clunk from the Spohn is the articulating joint when it loads and unloads under acceleration or braking.
Once I install some FatMat sound deadener I think I'll be good with not hearing the whine with the BMR TA.
If I do break the ten bolt, will probably install a Strange and try it.
My 1998 ProCharedCamaro never whined until I installed a Spohn Tunnel mount torque arm. Going from the stock 10 bolt to a Moser with 3.37 gears increased the whine so sold it went back to a ten bolt with 3.23 motive gears and solid pinion spacer with LPW upgrades. Hindsight tells me I should have also had the tubes welded also, but couldn't find a welder I could trust that might create more trouble with bad welds.
My Camaro is lowered with Sam Strano springs but even with a BFH to create additional clearance the torque arm bracket on the Moser it still almost punched a hole in the floor pan
With my auto and since I rarely street race or go to the strip I think I'll be fine at my rwhp level (565 ).
I removed and sold the Spohn torque arm and installed a BMR TA013 tunnel mount kit. That kit got rid of the clunking but not all of the whine. Whine now is some at certain speeds but still not the same as with the stock TA. The clunk from the Spohn is the articulating joint when it loads and unloads under acceleration or braking.
Once I install some FatMat sound deadener I think I'll be good with not hearing the whine with the BMR TA.
If I do break the ten bolt, will probably install a Strange and try it.
Last edited by dlandsvZ28; Mar 28, 2018 at 01:52 PM.
Thread Starter
Joined: Jul 2005
Posts: 5,898
Likes: 255
From: Ft. Wayne, IN
the whine at high speed just started in the last year or so. It sounds like a bearing once I get above 90. My torque arm is a BMR adjustable that mounts to BMR trans cross member.
On a side note...not selling the car. I just can't get rid of it.
On a side note...not selling the car. I just can't get rid of it.
Last edited by kinglt-1; Mar 30, 2018 at 09:03 AM.
