98cobrakiller

should i build my 10 bolt with eaton posi and moser axles. or should i buy a 9in or s60. motor is stock now. but 408 is on the stand and waiting for the ls1 to go

bayer-z28

iTrader: (14)

It really depends on what you will be doing with the car. I have a simple street machine with some respectable RWHP numbers, built T56 with a McLeod clutch and the rear has lasted me 11 years in stock form and I'm rebuilding it here soon (bent axle.) I'm not abusive to the car, but if I were to get into heavy track use or if I was more abusive, I would get a S60 as they don't rob as much power as a 9". Even tho the 9" is pretty bullet proof depending on the brand. If you plan on leaving on the converter at 5000rpm with real wrinkle wall slicks, then you'll need a 9".

Standard trans and plan on yanking wheels? 9"...

ULTIMATEORANGESS

iTrader: (4)

with a 408 id go with something stronger than a 10 bolt.

98cobrakiller

with the flt trans and yank 4000 ill be leaving around 3500rpm

Blackpanther99

iTrader: (8)

Go with a 9"

Midnight02

iTrader: (8)

Depends on what you plan on doing with the car. If you plan to track it regularly after you install the 408, then it's well worth going with a 9" or S60.

Guitar

iTrader: (9)

Remove LS1, install 408, sell LS1, buy rear end.

Beave

I dont think you will have problems, there are a few guys around here still running 10 bolt's with good differentials and gears in them with 400+ci motors holding up fine. A buddy of mine has been running mid 10s for years on his. If you are at the track every weekend pulling 1.4 60fts then i would say upgrade, for a street car with occasional track time i wouldnt worry about it.

Blackpanther99

iTrader: (8)

Agreed with him^

98cobrakiller

i may hit the track 5 or 6 times a year and maybe 3 or 4 passes at a time

Cra-Z Larry

You'd better have AAA or use of a car trailer!! I broke my 10 bolt with my current setup. The cost of your parts won't be far from a used aftermarket rear!! Or like Guitar said sell the LS1 and a new rear!!

02CamZ28

iTrader: (30)

I'd go with a mwc fab 9

98cobrakiller

i was thinking of a 12 bolt just to stay with a gm rear. and get the bolt in stiyle axles. the 12 bolt should be able to handle the 500rwhp from a auto

1BDHWK

iTrader: (18)

It may last you a good while being an A4, but it's a ticking time bomb with a 408. I would give it a 60/40 chance of hanging on with just a few trips a year to the track.

98cobrakiller

what rear are you running. and what set up is on your 408

loudblack97z71

iTrader: (2)

Put a solid pinion spacer and a girdle on it and let it eat, on the off chance that you break an axle just upgrade them.

Dickie-311

iTrader: (1)

I asked the same question 6 months ago... I bought a Moser 12 bolt