what rear?

[dakota]

hey guys i have a 94 z28. with a cc502 i was wondering what gear ratio do you guys all favor and what rear end ?

i wanna do the moser 12 bolt with 4.11s ?

[popo8]

what trans do you have?

[dakota]

what trans do you have?



ter 5er 6er

[96LT1355Z28]

A 12 bolt with 4.11's will be just fine. There are other options like a 9" or S60. Do some shopping around and I'll bet you'll be surprised at how close the cost is between them once they're bolted in your car. It just depends on what you want to change and spend! All are leaps ands bounds stronger then the 10 bolt we all started with. You'll need it espescially since your an M6 car!;)

[popo8]

.....i wanna do the moser 12 bolt with 4.11s ?


sounds like you got your answer in your initial post.... 4.11's GREAT CHOICE!

[BlueBottleZ]

hey guys i have a 94 z28. with a cc502 i was wondering what gear ratio do you guys all favor and what rear end ?

i wanna do the moser 12 bolt with 4.11s ?
STAY AWAY FROM THE MOSER 12BOLT! IDK IF ANYONE ELSE HAS ENCOUNTERED PROBLEMS WITH THE MOSER REAR BUT IVE SEEN A COUPLE AND HEARD OF MORE THAT HAVE ON GOING PROBLEMS WHERE THE TORQUE ARM BOLTS TO THE REAR! I have a moser 9" in mine and had nothing but problems from having to have brackets machined to fit the housing ends so the wilwoods to fit to the torque arm adapter being to long(lucky i have full access to a machine shop and a boss willing to do this stuff!)! Theres a reason you can order a moser rear and have it tomorrow but theres a 3mnth wait for a Strange 12 bolt! Another company that makes a nice rear complete or housing that bolts right in is Quick Performance.

[5POINT7]

I started a thread a couple weeks ago about rears, and this help me out, it was posted by joelster,

Strength of the unit is this:

Strongest to weakest:
Dana60, 9-inch, 12-bolt (with the 12-bolt being much further back). This will not be an issue with 99% of the people out there. 12-bolts are VERY strong compared to our stock rears but if you plan on single digit track times, I would look elsewhere.

Price:
They are all about the same. Expect to pay around $2400ish for a posi rear, and $2000 for a spooled rear irregardless of which unit.

Spool or no spool?
If your car is a dedicated track car, that enjoys the occasional cruise here and there, AND YOU KNOW FOR A FACT THAT YOU WON'T GET CAUGHT IN THE RAIN, then by all means get a spool. The weight savings alone is about 40lbs over a posi-equipped rear. It is stronger too.

Perks about each unit:
12-bolt, it keeps your car 100% GM, it is pretty popular, it sucks marginally more hp than your 10-bolt, it is the lightest of the 3.
Dana60, it is the strongest, comes with 35 spline axles standard, has the best pinion placement for hp loss, although the shear size of it makes it suck more hp than the 10-bolt.
9-inch, VERY POPULAR, can buy different center sections with different gear sets and swap gears in no time. Tons of options available for it with regards to axles, gear sets, etc..

Drawbacks to them:
12-bolt is the weakest. Some hard core guys can break them. There are options to make them stronger but they add to the price ie:bigger axles.
Dana60. It's heavy. Expect a posi S60 to weigh between 220-230lbs, a spooled one will only weigh 185 (I weighed mine ;)). You will need a new driveshaft.
9-inch, It's heavy as well. It "supposedly" sucks the most hp to turn it because of how low on the ring gear the pinion gear engages.

All 3 will suck more power than your stock 10-bolt, meaning if you ran 12.50's before, expect to run 12.60's or worse when you swap rears. All 3 will add considerable value to your car as well. All 3 are light years stronger than the stock 10-bolt. I know that my Dana60 needed a different driveshaft, I am not sure on the others though. Maybe someone else could chime in with the correct info about the 12-bolt and 9-inch, and whether or not they need new driveshafts as well.

I went with a S60 from Strange Engineering. I got a spool, aluminum rear cover, upgraded axles (35 spline s/t) and 1/2" wheel studs. With shipping I paid right around $2000. I know they are a few hundred more right now, I got mine when they first came out though. It bolted in without a single problem in about an hour and a half.

[dakota]

what about just buying internals for the 10 bolt? thats doesn't make it stroger or anything does it ? and would that improve your times ?

[96LT1355Z28]

what about just buying internals for the 10 bolt? thats doesn't make it stroger or anything does it ? and would that improve your times ?

Yes new internals will be stronger than stock but still not strong enough. The problem is the rear end is just too small to handle the power our cars throw at them. I won't be the first to tell you don't spend any more money on your 10 bolt than you must. There was a link somewhere where a guy did some strengthing in key areas of the 10 bolt and claimed it to be as strong as an aftermarket rear. IDK if there's any truth to it but I'd rather bolt in a finished product I know will work than spend hours and $ of fab work and still never know if it's gonna break. If you have to keep it untill you can afford a better rear just but the minimum to keep it on the road. The rear itself won't make you car faster, it will be stronger allowing you to get the full potential out of your engine and driveline. Gear selection is gonna come into play as far as how much you want to give up on the top end for better bottom end acceleration. Same concept as suspension parts don't speed up the car they allow it to use all of it's potential. The end result is a faster car because you have parts then are made to handle what your throwing at em! :cool:

[dakota]

Yes new internals will be stronger than stock but still not strong enough. The problem is the rear end is just too small to handle the power our cars throw at them. I won't be the first to tell you don't spend any more money on your 10 bolt than you must. There was a link somewhere where a guy did some strengthing in key areas of the 10 bolt and claimed it to be as strong as an aftermarket rear. IDK if there's any truth to it but I'd rather bolt in a finished product I know will work than spend hours and $ of fab work and still never know if it's gonna break. If you have to keep it untill you can afford a better rear just but the minimum to keep it on the road. The rear itself won't make you car faster, it will be stronger allowing you to get the full potential out of your engine and driveline. Gear selection is gonna come into play as far as how much you want to give up on the top end for better bottom end acceleration. Same concept as suspension parts don't speed up the car they allow it to use all of it's potential. The end result is a faster car because you have parts then are made to handle what your throwing at em! :cool:


thanks great info man, what if i found a set of 4.10s for the ten bolt could i just have a place pop em in till i can afford new rear?

[Wooshie]

Yes new internals will be stronger than stock but still not strong enough. The problem is the rear end is just too small to handle the power our cars throw at them. I won't be the first to tell you don't spend any more money on your 10 bolt than you must. There was a link somewhere where a guy did some strengthing in key areas of the 10 bolt and claimed it to be as strong as an aftermarket rear. IDK if there's any truth to it but I'd rather bolt in a finished product I know will work than spend hours and $ of fab work and still never know if it's gonna break. If you have to keep it untill you can afford a better rear just but the minimum to keep it on the road. The rear itself won't make you car faster, it will be stronger allowing you to get the full potential out of your engine and driveline. Gear selection is gonna come into play as far as how much you want to give up on the top end for better bottom end acceleration. Same concept as suspension parts don't speed up the car they allow it to use all of it's potential. The end result is a faster car because you have parts then are made to handle what your throwing at em! :cool:

I have a 10 bolt from a 2001 SS with welded tubes, zexel torsion posi, moser axles, and GM/Motive 4:10 gears. My original was noisy after about two months of fun and this one has lasted about 6 months. I will be in the market for something stronger over the winter.

[96LT1355Z28]

thanks great info man, what if i found a set of 4.10s for the ten bolt could i just have a place pop em in till i can afford new rear?

I think that's pretty much what all of us have done!

[Jperran]

thanks great info man, what if i found a set of 4.10s for the ten bolt could i just have a place pop em in till i can afford new rear?

It's not exactly as simple as popping them in. Expect a few hundred dollars in labor charges.

[jakesz28]

Midwest chassis's fabbed 9" all the way.

Nice strong and light compared the moser.