My best time on a 145hp shot was 11.0039 @ 125mph, 1.55 60ft. This was on the stock gm 10bolt diff(only thing I did was weld the axle tubes and put a TA diff cover on)
I wanted the "10second" slip bad so I upped the juice.

I hit the nitrous out of the hole too, here is the result.
The "TA" aluminum diff cover


First thing I saw when I took the cover off


The pieces that I took out


The end result


Good thing I was the last car of the day and the last race of the year!!
Time for a ford 9"

 

ouch!...i hope my rear doesnt ever do that....was that a stock unit? ive got the zexel..hoping it holds better than that.

 

Oh yea, this was my second pass, i was going to hit the nitrous in 2nd, i never made it out of first, this is a richmond 4.10 gear.

 

Nice carnage.

 

I had one do that with a stock motor and about 250,000 or so miles when I got it. I done one burn out then it made a bad sound and locked up, gotta love a 10 bolt

 

now all the kids can see what the inside of a posi looks like! you guys make me nervous....hope mine doesn't do that before i get a 9 inch

 

That sucks....

I used to have a 1982 Indy Pace car that had a 406 with the stock rear end and would spray that with a 250 shot running 10.50's and all I would have to do is replace the gears and bearings every year.

 

Ouch!!!! that sucks!!!! What does a tow from Gimli cost by the way....? Just in case I break something next year.

It's bad when you hope to run so strong that you expect to break things

I have to get bigger injectors and a tune first, cause my AF ratio was way too lean to drive let alone do a 1/4 mile.
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Do you plan on doing the ford 9" yourself?

 

Although they are much stronger, a 9" is not indestructible. Here's what I did to mine earlier this year. I caught it before it failed and caused any damage. A light tap with a hammer and the piece broke right off.







I threw in a spare center section to finish off the season. I have a Moser aluminum center section just waiting for a different set of gears before I swap it out.

It's those 6000 rpm transbrake launches that caused problems

 

jeez, i've been spraying mine with a 150 shot but not out the hole, i give it a good 40-50 ft before i do anything still doing 1.5-1.6 60 foots and its still holding strong. hope my luck doesnt run out

I always hear its the carrier that breaks alot and not always the ring gear

 

You guys are lucky, i ate up 4 rear ends (lucky i had a buddy that parts out these cars so rears were readily available. 1 two yrs in a row, then 2 in one season...and that was back when i was running 12's-13.00 spun the teeth clean off the ring gear every time.

 

So then what is the best diff, w/o breaking the bank.

 

Probably pick up a Rockwell 2 1/2 ton for not very much...... lol

 

Anybody got failure stories on a 9 bolt? I just put 4.11's in it and plan on hitting it with the juice. It it fails, I won't be able to get parts for it.

 

Broke the pinion on my 9-bolt on the first pass with the fresh engine. 12.9 @ 106 mph.
Took a tooth clean off. You could hear the tapping sound on the ring gear when the gap in the pinion passed by. Not knowing exactly what the damage was, I made another dozen passes, however traction was starting to go away and I never laid down the same 60'. Probably saved the rear from shredding completely.
Still drove it another 300 hiway miles in a round about way home and somewhere along the way another tooth broke off and things got really noisey. Got home under my own steam though.

 

I'm surprised the 10-bolt has held up WITHOUT the spray.

 

How was your luck in finding 9 bolt parts around T.O.?

 

I had a spare differential in my shop and removed the ring and pinion from it.
Had to change from 3.70's to 3.27's.
Lots of choice if you want to buy an offshore gear set like Motive Gear ( which I won't do ). If you want to spend the extra dough you can pick a USA gear set for about three times the cost.
My understanding is that the 9 bolt isn't worth the dollars on gears and rebuilding.
Can you say Moser?

 

broke the spyder gears in my 3.27 9 bolt on a high 13 second pass. was cuttin 1.7x 60 foots on it tho

couldnt find parts and got a 10 bolt LS1 rear end complete for 300 bucks. less than 30K miles on it. Holding up great so far