NJFBOA - Home of New Jersey's Camaros and Firebirds - View Single Post - Moser 12 Bolt and 4th gen UMI Suspension bits

qwikz28 · 09-07-2014, 11:04 AM

I have a Moser 12 bolt - 4 channel, 3:73s, TrueTrac, 33 spline, 1350 yoke, Aluminum rear cover, extended ARP studs, new GM backing plates (see pics, backing plates are bent from falling off jack stands during storage).

The rear was originally a 4:10 set up but I had Josh at JS Performance swap out the gears for 3:73s. Apparently something about the gears being different style carriers causes them to have a slight hum/whine from about 45-55mph (as indicated on my dash). Nothing terrible like a bad bearing, but you'll definitely notice it is there. Unless I"m in a highway gear, my motor drowns it out.

I redid the bearings over the Fall and added seals (Moser just uses RTV, some guys on this forum helped me with that). I also replaced the rear diff cover gasket with a Mr. Gasket and refilled the rear with Motul 300 (as recommended by Moser). It was when I swapped out the bearings that I decided to replace the backing plates (GM stopped production of them shortly after so I was lucky with that).

Last, I should note that I am the second owner of this rear. The original owner was a older gentleman in upstate NY that had a Firehawk with a built motor. He took the car to the strip, but I didn't. I had Josh inspect it when I went in for the gear change, which I believe was back in 07 or 08. Diff looks good and has been flawless since, with the exception of the leaky seals I replaced last fall.

Asking $2000, or $2250 package with the below parts

Also have three UMI suspension parts. Adjustable panhard rod, 98-02 trans mounted adjustable torque arm and a 98-02 T56 Torque Arm relocation kit. All are red, all purchased new by me. Minor scuffs on all. Panhard rod likely needs new rod ends.

Panhard rod - $50
Torque arm - $200
Relo Kit - $175

PM me if you have questions. Pics below.

Thanks,

-Jake

09-07-2014, 11:04 AM	#1
qwikz28 13 Second Club / Moderator Join Date: Jan 2005 Location: Franklin Lakes, NJ Posts: 8,694 iTrader: (6) Social Networks:	Moser 12 Bolt and 4th gen UMI Suspension bits I have a Moser 12 bolt - 4 channel, 3:73s, TrueTrac, 33 spline, 1350 yoke, Aluminum rear cover, extended ARP studs, new GM backing plates (see pics, backing plates are bent from falling off jack stands during storage). The rear was originally a 4:10 set up but I had Josh at JS Performance swap out the gears for 3:73s. Apparently something about the gears being different style carriers causes them to have a slight hum/whine from about 45-55mph (as indicated on my dash). Nothing terrible like a bad bearing, but you'll definitely notice it is there. Unless I"m in a highway gear, my motor drowns it out. I redid the bearings over the Fall and added seals (Moser just uses RTV, some guys on this forum helped me with that). I also replaced the rear diff cover gasket with a Mr. Gasket and refilled the rear with Motul 300 (as recommended by Moser). It was when I swapped out the bearings that I decided to replace the backing plates (GM stopped production of them shortly after so I was lucky with that). Last, I should note that I am the second owner of this rear. The original owner was a older gentleman in upstate NY that had a Firehawk with a built motor. He took the car to the strip, but I didn't. I had Josh inspect it when I went in for the gear change, which I believe was back in 07 or 08. Diff looks good and has been flawless since, with the exception of the leaky seals I replaced last fall. Asking $2000, or $2250 package with the below parts Also have three UMI suspension parts. Adjustable panhard rod, 98-02 trans mounted adjustable torque arm and a 98-02 T56 Torque Arm relocation kit. All are red, all purchased new by me. Minor scuffs on all. Panhard rod likely needs new rod ends. Panhard rod - $50 Torque arm - $200 Relo Kit - $175 PM me if you have questions. Pics below. Thanks, -Jake