dug

iTrader: (10)

And without wheel hop.

Im thinkin about getting some 4.56's for the 10 bolt. Im hopin that the stock clutch wont hit as hard and the gears will last a lil while.

racer88

I didn't break mine and raced on it for about 9K miles after the gear swap to 4.10's but I did replace the Posi and bearings. All I had was headers and my car hit very hard in 2nd gear. Something to do with the lowering springs caused my car to dead hook and hit hard. I am not complaining at all because I cut some 1.74 60's with it on nitto's only launching at 3-3200. I still have the same clutch and a cam and 12 bolt now. Only thing that isn't happy is my clutch these days....I need a stronger one.

You should be fine for awhile. My old 10 bolt w/ 4.10's is currently in a 99 A4 Z that has 202 heads and the same 212/218 cam I have and he's been fine so far with no stall.

ZR2877

After reading all the bad stories with 4.10s racer88 you help me breath a sigh of relief. I don't abuse my car much so my 4.10 should last a while. Thanks

KGSloan

i broke my 10 bolt with 4.10's in it. on the third pass ever with them. tried to launch with nitto's and , i shattered the spider gears . this was with a stock, 40k mile, LS1 clutch. not even a ZO6 clutch. i wouldn't advise 4.10's in the 10 bolt, i think you're just pushing your luck. you might be one of the very few lucky people that don't break, but the chances are you won't. too many people break them with 4.10's in there.

taqwache

twice

dug

iTrader: (10)

Yeah, I promised myself not to put any money into the 10 bolt. Too bad I missed the moser special. 1650 for a spoold 12 bolt is reasonable.

VENOM_SS

YEP! i broke my 10 bolt w/4.10's three times, at that point all i had done was heads and intake and an air box mod. ive heard lots of horror stories about the "glass jaw" of an LS1 car, and they are all about the 10 bolt. i spent the money for a 12 bolt, and never looked back. ive spent TONS of cash on my car, and by far the best thing i ever did was get a 12 bolt. cant beat a HD 9" either. most of the really high horsepower cars ive driven all had 9" rearends. when you get over 500rwhp, i suggest a 9" cuz 12 bolts arent too much stronger than a 10 bolt at that point. my current project for my 01' SS is a large bearing 9". im sitting at 507rwhp and 413ft.lbs tq and im about to add a 250hp shot of nitrous. my 12 bolt is showing signs that it doesnt like those numbers too much, much less when that 750hp hits the pinion after i get this NOS installed! all in all, a 12 bolt upgrade is a must even with a mostly stock LS1, if your want to use 4.10 or higher gears. exspecially if youre running a six speed and like to shift HARD!!!!

mcflyz28

I try everyday so far no luck

samz28

are you guys pre-loading your suspension or just dropping the hammer? I guess with an m6 you'd need to slip some clutch to pre-load the driveline like an automatic does.

dug

iTrader: (10)

When I race I try and remove any back lash before the launch by inching up to the line slowly without coasting. There are so many factors involved that affect longevity of the 10bolt. Preload like you said, spinnin on rough or cracked roads, or wheelhop. A sticky clutch is what scares me the most. Seems like they can shock the driveline hard enough to break a 12bolt. Its crazy the wide range of failures and survival.

Theyre are people running 10's with a 10bolt and others who break them with a 13 second car on regular radials. What gives? How much is luck and how much is the driver? My guess is wheelhop, spinning on rough pavement, and nailing the throttle during decel when the gears are loaded the other way is what kills them. Also hard downshifts without heeling and towing adds stress. Avoid these things and maybe a 10bolt with 4:10's might last a year.

KGSloan

i did not do anyone of these things to make my 10-bolt go quicker. i put around 500 miles on the new gears and then went to the track that weekend. never even spun the tires once before it broke, so i don't think that wheelhop or whatever had anything to do with it.

my point is this, you can try to take care of it and may get lucky, but chances are even if you're really easy on it, it's going to break. i believe it is almost all luck if the 10-bolt breaks or not and you're bringing bad luck upon yourself by putting in 4.10's. JMO

ss rally red

iTrader: (8)

I have 30 or more passes on my 10 bolt & 4.10's but all were with street tires, I will find out how long it will last with Nitto's this year.

BadAndy

Hey Ken, can you guess which one I will be?
I think the stock clutch will help save the rear, but then again, folks break them with stock gears and stock clutch.

racer88

I don't know how lucky I got, but consistently I pulled 1.7-1.8 60's out of it...on the street it hit 2nd so hard just dead hooked. At the track most I could go out on Nitto's hooking was 3200-3500 depending upon track condtion. I don't drop it hard on my launch I guess I slip it a second and then drop it. It worked for me....that rear end has been in that 99 A4Z since Dec and he's running 11.9's on 1.8 60's on nitto's.

Weird but I am glad I bent over and got the 12 bolt anyway

racer88

Don't worry I made 24 passes in one day with 180 miles on the gears.....at a track rental went home and raced on it again and again...for 10 months I ran my 4.10's in my 10 bolt.

And many 2nd gear hits on the road with dead hooks!