I got the "7.5 inch 10 Bolt blues!" - Third Generation F-Body Message Boards

Fast 383 · 08-16-2009, 09:21 PM

Well, I changed my oil, swapped out the new Pro Systems carb, and mounted up some new Mickey Thompsons.

Take the car out for a little cruise. I get about 5 miles out and decided to hit it. The car hooked hard and pulled like a train. The I hear it! The loudest knocking I have ever heard from a car. Limp it back to the house and scrath my head for a while. Could only be trans, driveshaft or rear? The Flexplate and Torque converter are spinning fine.

Pull the rear cover and bam! rounded out ring gear and a pile of teeth!

This rear had Moser axles, long studs, Moroso alluminum cover, aftermarket 4.10's and Auburn carrier.

Think I should repair or replace?

//<86TA>\\ · 08-16-2009, 09:32 PM

repair would be the fast cheap way, but it will happen again. If the buget allows, maybe think about upgrading

mw66nova · 08-16-2009, 09:40 PM

9" time...never have to worry about it again...well...as fast as you are going currently. even with some spray you should be good on it. i love my moser 9" unit.

Orr89RocZ · 08-16-2009, 09:44 PM

Man, i'm one of the lucky few that never had a problem with a 10 bolt. full nitrous launches in the 1.4x 60's and it held, bone stock rear end out of a 4th gen.

Cant wait to try it out with the turbo motor

fix it with another stocker for a cheap quick fix but definately need a new rear end.
Keep the ring/pinion to a 3.42 or maybe 3.73 and it will last longer. Less teeth on those gears so the teeth are actually thicker/stronger

Fast 383 · 08-16-2009, 10:03 PM

Damn if I didn't just buy a brand new open car trailer for $2500. I would have had Moser make me up a killer 9 inch.

The funny thing is...I was the guy saying " Look how fast i'm going on a stock rear!" Who needs a 9 inch.....

I'm gonna have to patch it up for the season and save over the winter. God doesn't want me to have that new nitrous kit! Or maybe it's the wife,

ZONES89RS · 08-16-2009, 10:03 PM

Yep, swap it out for a stocker to keep it going and or save for a 12 bolt/9inch/60 of your choice. I for my Moser 12 bolt used for 150$, but i know i will never need to but a rearend again for my car.

Shagwell · 08-17-2009, 10:40 AM

Taller gears(numerically lower) have larger pinions gears, and thus more teeth on the pinion. More teeth = more contact area between the ring and pinion. I have said for a long time that the 7.5" 10-bolt will do quite well as long as you don't go lower(numerically higher) than a 3.73. Past that they become unstable really quickly.

Personally, I'd go 12-bolt or S60. 9" eats more power for nothing.

bluegrassz · 08-17-2009, 10:53 AM

I hate to hear the news. I know you can taste 10's with the new carb and tires.

In your case, I would just pick up a 10-bolt and salvage what parts you can.

Fast 383 · 08-17-2009, 04:47 PM

Quote:

Originally Posted by bluegrassz

I hate to hear the news. I know you can taste 10's with the new carb and tires.

In your case, I would just pick up a 10-bolt and salvage what parts you can.

You know it. I guess i'll hold off on the 4800 stall also because if it can't hold the 10 incher. I know i'm in trouble with the 8"

Atilla the Fun · 08-17-2009, 05:07 PM

9" housing, with a Strange aluminum centersection that takes GM 12-bolt car gear sets. The best of all worlds. if you do that, you can go 33 spline.

kens86 · 08-17-2009, 05:46 PM

just replace your stocker for now and save for a 12 bolt or S60. S60 gets my vote though.

big gear head · 08-17-2009, 10:08 PM

I'd put in a Moser 12 bolt. You wouldn't have to worry about it again.

mw66nova · 08-17-2009, 10:27 PM

moser 12 bolt would be my last choice. they don't use through bolts on the torque arm. if you want a 12 bolt, do a Strange unit, if you want a 9", moser all the way.