Brennen's01SS

iTrader: (1)

Do it but make sure you use motive gears. 4.10 should have came stock in 6spd f-body!!

msydow

^^^^^^+10,000 on the motives. i still have my 10 bolt with motive 4.10's in the shop.

KreeperKamaroSS

not to threadjack but what's the higher risk of running 4.10's? are they weaker than the ones that come stock or do they just put more stress on the already weak stock rear? is there a style of driving that one should avoid to keep from blowing the rear, or just hard clutch drops with sticky tires?

COPO9560

4.10 will give you a lot of fun and grin factor. With the 6 speed, highway rpm's are easy to live with.

That being said, if you buck up for a 9 inch - do some math before you pick your ratio. Be honest about your trap speed, tire size and engine rpm on your final modded product. Really just a math exercise from there.

9 inch while expensive will give you peace of mind and lots of room for future hp growth. Not a cheap swap when you add in driveshaft, LCA's and new torque arm but like most things in life you get what you pay for.

HioSSilver

iTrader: (8)

For starters...you don't know me or my methods so blow it out your ***. Where's your sig? Have you went from 3.90's to 4.10's? Do you know anything except how to run your stupid mouth?

Now that I got that out of the way...To the op. I have broke 2 set's of 4.10's...and yes I know how to set up rears and actually make them run quietly. I have had my best 60'ft with the 3.90's anf the car picked up 2mph in the 1/4 by going to the 3.90. I turn the engine 6800 and was hittting the rev limiter at the top of 4th with the 4.10's @ 122+. It now run's 124+ with the 3.90's and it seems to make the torque of the engine work harder instead of just makeing you feel faster because your shifting more. Also there is more tooth contact with the 3.90's makeing them the stronger gear. Trust me, do the 3.90 or 3.73 the 4.10 are'nt all their cracked up to be. I run 11.1-11.2 with a 6spd and a 10 bolt....I know a little about makeing them live.

*02WS6TURK*

iTrader: (13)

If I had my choice from the factory, I would want 3.73 or factory 3.90's. Spend the few hunderd bucks on 4.10's and rally that thing. If your 10 bolt breaks, whoopy. Find another for dirty cheap or put in a 9. I never use 6th gear btw in case you are thinking you might have to use it much on the HWY. I never touch it. Plenty of gear left

QuadratSS

Due to the overwhelming positive response I think I have found my first real mod. I just have to really decide on 4.10's or 3.90's. I'll probably get a rear end girdle cover to help keep things strait and tight. I can live with noise I don't even have a muffler. Hard core launches prob not too big of a deal. Stock slp wheels with factory size goodyear F1's. Car goes to the track maybe once every two years. I launch off the line lock with pressure on the drive line. I think it's the hard core second gear shifts that might get me. Wish I had the cash for a 9'' but just not possible right now. Thanks for the insight all opinions taken into consideration.

Mike Morris

iTrader: (55)

Weld your axle tubes as well. Still have a goo shot breaking it though

Element

iTrader: (5)

If you can pick up a used girdle for cheap, go for it; otherwise, as one LS1 shop owner told me, "Putting a cover on a 10-bolt is like putting Elmer's glue on a toothpick and expecting it to be stronger." It does make gear oil changes slightly less messy, though.

My prior condemnation aside, I love having the 4.10s in my car and definitely wouldn't go back to a higher gearing. Having driven my car and a 3.42-geared M6 car back to back, the 4.10s just give the car a whole new set of *****.

And, if you get lucky and get no gear whine, great, but if you do...it's good incentive to save up for a better axle.

Element

iTrader: (5)

The ring gear is thinner, due to the higher number of teeth cut into it (there's a picture showing 4.10s against stock 3.42s, and the difference in ring thickness), and it also puts more stress on everything in the rear end. Ring gear thickness doesn't seem to be an issue for the majority of people with 4.10s - it normally seems to be blown-out posi units, or sheared ring/pinion teeth. The pinion teeth have less contact per ring tooth with numerically-higher gears, but that's spread across more teeth in contact at once...but that's something for the gear gurus to debate.

Clutch dumps and hard shifts can cause issues with 4.10s...but it can cause issues with stock gearing, too. F-body 10-bolts...proof GM engineers are sadists.

ElkySS

iTrader: (6)

went through 3 4.10 geared 10 bolts. all had a girdle. none of them broke the gears. broke one spider gear diff and 2 torsen diffs. i now have a 12 bolt with 4.10s. whines its *** off

Canbarelygo

ive got motive 3.73's in my auto car and they dont make a noise what so ever and i leave on spray plenty. a buddy of mine had 3.90s and they were a good all around gear theyre kinda pissed around town and rippin on it but theyre still pretty tame on the highway i think you could cruise 80 with his on like a 25.x inch tire at like 2100 or something but i could be wrong.

one factor though you need to think of is tire size that can affect a few things as well. id suggest either it doesnt really matter you gotta think the difference between 4.10's and 3.90's is what .2 of a driveshaft rotation? if you were an auto car we would have an arguement but your a 6spd so we really dont. the reality is yes the 4.10 is the weaker gear and if you have a badass set your gears up like i did they wont make a sound its all about what your willing to live with.

i would suggest the 3.90s simply because its so close to a 4.10 you would really tell any difference between the 2 and it would be a bit tougher and you wouldnt have to shift as much when your in it and it turns slightly less rpm on the highway. sort of a no brainer

96blackz28

iTrader: (3)

Um? I blew apart my 4.10 motive ring gear. Get OEM GM gears

Canbarelygo

well has anyone blown up a set of properly set up 3.90's? i think we are getting to an answer for him lol.

*02WS6TURK*

iTrader: (13)

Exactly

Intragration

iTrader: (1)

I say go with 4.10s. Seems that 3.90s would be a good choice for someone with a really fast car that's trapping too high for 4.10s. Doesn't sound like your goal is mid-120s...? As for traction, I can't see how 4.10s are going to be that much harder to control than 3.90s. And you'll always have those two overdrive gears. I also drive a car with a big block, 3.55s and no overdrive and THAT'S not a huge deal for me, although I don't usually cruise much above 65.

xxrillixx

iTrader: (118)

I loved my 4.10s... had them for a few years and it held up great with the TA cover. Loved it, wouldnt have another bolt on 6spd fbody without 4.10's.

Sold it to a buddy with a stock cover, broke 4-5 months later.

I wouldnt say thats significant proof, but it held up for me. Ive even got the stock rear in my 600hp 700trq turbo camaro with the TA cover (3.23 gears)... no issues.

Does that mean I dont keep an extra rearend? No, as I know it will break. But for $250-350 for a complete rearend its a bargin. Versus 10x that for a 12 bolt or 20x that for a 9 inch that ive STILL seen break. I dont launch it that hard that often to justify that kind of money.

If its a track car, by all means go with a 9". But for what most people do every day, i think its extreme.

INMY01TA

iTrader: (1)

I don't care what your car runs anyone who says 4:10s are too much is ignorant or personally biased.

HioSSilver

iTrader: (8)

Motive is the manufacterer for OEM gears.

LS1_Sean

iTrader: (1)

4.10s are a good match for the 6 speed but the pining is tiny and more prone to breakage. I'm on my 2nd set of 4.10s if I had it to do again I would prob leave the 3.42