9" question for high hp Manual cars
 

After breaking two posi units in a 12 bolt, i'm thinking of making the switch to a 9" 550hp with a Mcleod twin disk, 3500lb car, Et Drags. 1.5 60's.

how much stronger is a posi unit in a 9 inch compared to a 12 bolt?

will a true Trak hold more than a posi unit?

I have spooled the 12bolt for now, but since we autocross/road course the car on occation I would like to go back to a rear we can autocross. I may buy an extra spooled center section to put in when I want to go fast at the track.

Just trying to find out how much stronger a 9" is compared to a 12 bolt. Can 9" with a posi or tru track handle 1.5 60's behind a 3500lb 6m?

what do you want for the 12 bolt? i have 2 stock 9" center sections to get you by untill you have enough loot. pm me

A few years back with my old set up...
355 LT1
Full weight
ProCharger P600B (12 psi)
T-56 with Centerforce Dual Friction clutch
Moser 9 inch
Moser axles
Strange 4.11 gear
Strange posi unit
1.49 sixty foot time with 500 rwhp

You'll have no problems with the 9 inch.

Thanks for the info nomorels1!!!!!!

SteveMiliz - I was going to throw it up for sale for $1,800 as it has weld-on relocaton brackets, 33 spline axles, 4:11 gears installed, TA Aluminum Cover, plus I have a extra set of 4:30 gears.

No problem. :drive:

I toste the idea around for a few and came up with the 9". I drag race more than any thing. So I would be bias. 9" or nothing, I'd say!

PS. I have a true trac posi unit. Working great so far.

9" is the only way to go for all out power handling.
You will never look back! :jest:

With a high horespower car a nine inch is the only way to go if you a have a manual trans. A 12 bolt just won't take the abuse after time it'll work with a pro gear for a while but you'll break it eventually. Be sure to put a pro gear in it a sreet gear will never live, the best I've done with a street gear is 3 passes. I thought it was a bad setup and bought another set and 2 passes it broke again :jest: . 1.32 60 foot 9 inch here. 3451 pds.

A 9 inch can break too though I 've ripped the pinion right out of the nodular iron case also awhile back in my 70 camaro stick.


Stick cars break shit ,but there fun as hell :drive:

Sweet wheelie! The best I sixty footed was 1.315 N/A in the mustang. But, I was quite a bit lighter than you. I didn't make it into the nines either. I had a stock T-5 tranny with a Centerforce DF clutch and it just didn't want to shift at high RPM's. So I ran 10.40's N/A with an engine set up for the spray. The 8.8 is a decent rear also, although not as strong as the nine inch. I had aftermarket axles and a spool in the 8.8". James