trex600450

How likely is it for me to break my rear using 410s in the OEM 12 bolt M6 ?

I am hard on my cars. I am not a garage queen car owner.

FirstYrLS1Z

iTrader: (4)

In a GM 12 BOLT(which has a 8.875" gear) not very likely,if it was a typo and you meant GM 10 BOLT(which has a 7.625" gear) in the f-bodies,very likely.

Darth_V8r

iTrader: (4)

I assume you're talking ten bolt and f body since the 12 bolt only came in trucks which don't use T56

Anything close to a sticky tire and aggressive launch is risking it.

I broke mine on a dead hook with continental extreme contacts - not exactly a street slick. FWIW

trex600450

youre right, I meant 10bolt. So based on your experience it will happen, as in break ?

SteenH

Yes it will break, unless you avoid driving the 6 speed like it needs to be driven!!

98cherrySS

iTrader: (2)

Broke one of mine on a 2nd gear shift at 3/4 throttle. Tire spun then hooked suddenly.

HCI2000SS

iTrader: (2)

I must be the exception lol. With the mods in my signature im still doing fine, but I know its probably just a matter of time

AnotherWs6

iTrader: (17)

I'll chime in - or ask a question - since I think everyone goes through this when they buy one these cars for the first time. It's always a risk. I was told...and feel free to correct me if you KNOW otherwise....that factory 4.10s are more forgiving than aftermarket units. Something about the different type of metal used, that they are not as brittle. 4.10's came in plenty of S10 pickups with the same rear. I have a new set in a GM box in my garage.

FirstYrLS1Z

iTrader: (4)

I've always believed that OEM GM gearsets were the strongest based upon:
An aftermarket gearset-no warranty
The GM gearset that came in the car off the assembly line-has a warranty as part of the factory drivetrain warranty.

AnotherWs6

iTrader: (17)

^^^^But these gears were behind 100hp 4 bangers. Dunno.

codyvette

iTrader: (24)

It doesn't matter much that the gears are strong or weak. The damage comes when the torque arm causes the 10 blt housing to distort. No gear is gonna stay meshed when it is not engaging the sister gear properly. A lot of times the aluminum driveshaft stays in tact and doesn't do much damage but sometimes it can wreck **** pretty bad.

FirstYrLS1Z

iTrader: (4)

'^^^^But these gears were behind 100hp 4 bangers'

NO ! Whether auto or stick,the rearend was covered by warranty
The muscle cars of the 60s',chevelles,gtos',442s',GSs'.
The 80s' GNs'.
The 4th gen f-bods.
The Syclones and Typhoons

Darth_V8r

iTrader: (4)

Didn't the cyclone and typhoon run 8.5" ring gear 10-bolt and not the 7.625" variety?

Similar question for lots of 60's and 70's muscle?

Valid point though for turd gens

FirstYrLS1Z

iTrader: (4)

I didn't list those because they had 7.5/7.625 gears,the list is because GM warranty also covered the rear gears.

AnotherWs6

iTrader: (17)

I'm saying that 4.10's in a 7.5 from the factory came ONLY BEHIND wimpy 4 bangers. So no **** GM would warranty them. There is no other application where a 4.10 is used in a 7.5.

M4N14C

iTrader: (3)

Motive 4.10's
T/A Cover
Detroit Eaton TrueTrac
315 R888's
380rwhp

6 months in and so far go good. I'm not launching at 5 grand (More of a 3k-rollout) but I'm banging gears and chirping tires everywhere else.