Pontiac GTO 2004-2006 - What gears would be the best?

3.91 or 4.10's????
Anybody have the 4.10's from gforce1320 yet?
I like highway roll racing but I also like going to the track so idk if I should just get the 4.10's or not.
How much would they slow me down on the top end?

I'm in the same boat as you. I'm about 75% sure I will get 4.10. When the time comes.

They wont slow you down ,it just makes it better

Not a noticable difference between a 3.91 and 4.10 rear.... I would just go with the 3.91, you wont really lose that much up top.... Figure you can almost top the car out in 5th gear.... and we got 6spd's

Ya im leaning more towards the 3.91's because I really dont wanna lose much up top but I wanna be a beast outta the hole also so idk, I also dont wanna break axles lol

Lol, I hear ya... I would love to pick up a 3.91, But I got a clutch thats calling me a bitch everytime i get on her and I would love to do some half shafts to sturdy up the rear for track season..... after a new clutch and half shafts, im doing 3.91's. My buddies got 3.91's and what a huge difference, Its a Monster outta the hole.... DO IT MANG!!!!

Lol, I hear ya... I would love to pick up a 3.91, But I got a clutch thats calling me a bitch everytime i get on her and I would love to do some half shafts to sturdy up the rear for track season..... after a new clutch and half shafts, im doing 3.91's. My buddies got 3.91's and what a huge difference, Its a Monster outta the hole.... DO IT MANG!!!!

haha Im going to eventually I wanna beef the rear axles up also but who knows when that will happen lol
and my clutch is doing the same!

You will lose 8-10 mph in each gear going from a stock 3.46 to the 3.91. Personally, I tried it and pulled it back out. I didn't gain anything at the track, and lost 2mpg on the highway. For the money, I think there are better mods.

You will lose 8-10 mph in each gear going from a stock 3.46 to the 3.91. Personally, I tried it and pulled it back out. I didn't gain anything at the track, and lost 2mpg on the highway. For the money, I think there are better mods.

Lol, There is no truth to that..... I dont know whats up with you car.....

You will lose 8-10 mph in each gear going from a stock 3.46 to the 3.91. Personally, I tried it and pulled it back out. I didn't gain anything at the track, and lost 2mpg on the highway. For the money, I think there are better mods.

:gtfo: my car with a maggie was a beast out of the hole with 3.91's
i gained 2-4 tenths in my 60 and half a sec in the quarter plus it made it a whole lot of fun to drive...get em and dont look back

Lol, There is no truth to that..... I dont know whats up with you car.....


Ha Ha Ha. Yeah there is no trueth to that. WTF are you smokin? You have never seen my car run. I had it at the track a couple of weeks before the gear swap, and then right after the swap. Better weather after, and still wasn't quicker or faster. 113 trap speed before, 111 after, consistently.
Losing 2mpg on the highway is pretty hard to dispute also since I drive the shit out of my car and put 25K on it last year. I have a pretty damn good idea of what my mileage is all the time. I check it every time I fill up.

3.91's are a blast. And you should know, see, and feel a difference in the change, weather its right for you and your situation, being it a daily driver or just a track car is up to you. I would go 3.91 and not 4.10. Our gearing in our M6 trans will equal it out, giving you the same total gearing like in the f-bodys who are using a 4.10

Thanks guys Im gonna go with 3.91's

Ha Ha Ha. Yeah there is no trueth to that. WTF are you smokin? You have never seen my car run. I had it at the track a couple of weeks before the gear swap, and then right after the swap. Better weather after, and still wasn't quicker or faster. 113 trap speed before, 111 after, consistently.
Losing 2mpg on the highway is pretty hard to dispute also since I drive the shit out of my car and put 25K on it last year. I have a pretty damn good idea of what my mileage is all the time. I check it every time I fill up.

LMAO First off, your not going to lose 10mph in each gear... You have to be a complete moron to think that or say that lmao.... Secondly your car is not going to be slower with a rear end thats getting your car into its powerband quicker... thirdly, your losing ET with this rearend??? Its called DRIVER MOD!!! The only thing i will agree with you is that i can see someone losing a couple MPG do to the R's being up a tad.... Not a big deal.....

from 3.91 to 4.10 it is only about a 4.7 % difference. honestly i think you might get a 1mph or less trap speed difference.

LMAO First off, your not going to lose 10mph in each gear... You have to be a complete moron to think that or say that lmao....

Stock 3.46 gear:
rpm 1 2 3 4 5 6
5500 41 59 85 121 144 202
3.91 gear
5500 36 52 75 107 128 179

oops you're right, only 5mph in 1st, 7 in 2nd, and 10 or more in the other 4 forward gears at any given rpm level.

Secondly your car is not going to be slower with a rear end thats getting your car into its powerband quicker... says you...

thirdly, your losing ET with this rearend??? Its called DRIVER MOD!!!

I didn't say ET, I said trap speed - read jackass - time slips to prove it. I got plenty of driver mod bitch...

The only thing i will agree with you - good for you... is that i can see someone losing a couple MPG do to the R's being up a tad.... Not a big deal..... Unless you DD your car and put 25K+ on it per year.

OP, get the gears. I'm not telling you that they won't work for you. You asked for oppinions, and I gave you mine. They DID NOT work for my setup contrary to the belief of some. Also, if you plan on going FI or nitrous ever, the gears may be too much on an A4 car, but you would probably be OK with an M6. You don't have any slippage like you do with a high stalled A4, so you won't run out of rpm in 4th at the end of the track.

I do dd drive the car but I think losing a couple mpg wont hurt too much

Yeah, like I said, get them and see how they work for you. You might like them. I liked how the car pulled in 3rd and 4th gear, just didn't see the gains to justify the cost. I put the money elsewhere.

OP, get the gears. I'm not telling you that they won't work for you. You asked for oppinions, and I gave you mine. They DID NOT work for my setup contrary to the belief of some. Also, if you plan on going FI or nitrous ever, the gears may be too much on an A4 car, but you would probably be OK with an M6. You don't have any slippage like you do with a high stalled A4, so you won't run out of rpm in 4th at the end of the track.

:thumb: Whatever you say boss lmao.... Im not here to argue with you......

Yeah, like I said, get them and see how they work for you. You might like them. I liked how the car pulled in 3rd and 4th gear, just didn't see the gains to justify the cost. I put the money elsewhere.

Yeah I will, they are exspensive for gears lol

Looks like someone got told....LOL :gtfo:

Unless you have 3:91... you wouldn't know... I don't see how some people think they know more about a car than the owner... Yes, it will hurt your trap...you may have a better ET but your trap will be slower... Your ET will be faster because of 60ft and 1/8th mile...Your average speed during the coarse of the track will be higher, hence the better ET...

I hope you're not referring to me, because if you are, you obviously can't read. I clearly stated that I have installed, tested, and removed 3.91's from my car. For some reason, my setup seams to prefer the 3.46's. The car picked up more with the FAST then it did with the gears for roughly the same investment.

Take it easy dude, why the fuck are you so edgy???? So quick to take offence at everything, Take a chill pill....

Not edgy at all, just stating a fact. I love how everyone jumps on the bandwagon and doesn't think for themselves. Just assumes that whatever works for some works for all.

i run 4.56 in my gto and love them. runs great with a huge cam and a 5000 stahl verter

with the lock up it still runs down the highway fine

What size tire are you running though? Most of us are still running a 26ish inch tall tire, which would make 4.56's really suck on the highway. Looks like you ought to be in the 10's pretty easy now.

What's the approx cost to have gears changed, $1K?

about that, unless you get them used or plan on doing the install yourself.

What size tire are you running though? Most of us are still running a 26ish inch tall tire, which would make 4.56's really suck on the highway. Looks like you ought to be in the 10's pretty easy now.

i also run 4.56's and they are not bad on the highway at all. i get over 20mpg on the highway still, but it is around town it is in the single digits.

What size tire are you running though? Most of us are still running a 26ish inch tall tire, which would make 4.56's really suck on the highway. Looks like you ought to be in the 10's pretty easy now.

i was running a 28 and now going to a 29.5 tall. but i do my own installs and gears are cheap for a 9"

3.73's

3.73's

those arent enough for me plus im a m6

Cam it before you get gears!

Cam it before you get gears!

Haha whats up taylor?
I am def cammin it before the gears lol
Hey I got my longtubes and custom exhaust done, its really loud but I love it!

Haha whats up taylor?
I am def cammin it before the gears lol
Hey I got my longtubes and custom exhaust done, its really loud but I love it!

Thats good. Javier wrecked his Goat so hes parting it out and I'm picking up his ported Fast 90 intake manifold. Should push me over the 400rwhp mark!

Thats good. Javier wrecked his Goat so hes parting it out and I'm picking up his ported Fast 90 intake manifold. Should push me over the 400rwhp mark!

Yeah I saw that, you should def be over 400rwhp
when you gonna put it on?

Yeah I saw that, you should def be over 400rwhp
when you gonna put it on?

Not sure. I have to buy a bigger throttle body to go with it. Once I sell my Ls6 intake manifold then I can buy that. I'm also at 92% on my injectors so I might wait to do all of that at once. I just didn't want to pass up on this awesome deal.

Not sure. I have to buy a bigger throttle body to go with it. Once I sell my Ls6 intake manifold then I can buy that. I'm also at 92% on my injectors so I might wait to do all of that at once. I just didn't want to pass up on this awesome deal.

yea I hear that Im ready to get my damn cam in lol just dont have the money for a tune yet plus I gotta buy another pulley before I do that.
You going to beach this sat?

yea I hear that Im ready to get my damn cam in lol just dont have the money for a tune yet plus I gotta buy another pulley before I do that.
You going to beach this sat?

I dont know, I have work til about 1030, but send me a text or something to remind me.

I dont know, I have work til about 1030, but send me a text or something to remind me.

ok Ill do that

those arent enough for me plus im a m6

I have a lot more power than you, and I'm an M6 and with 3.91's or 4.10's I'd be just about at the top of 4th at the end of the 1/4. PLUS I get 27 MPG on the highway with 3.73's.

3.73's are more than enough for any decently modded setup..with a cam and high revving combo they like to stay in the gear a little bit more......go with 3.91's if you're not planning on doing a shit ton to the motor and need to get the most out of a weaker engine with slicks and traction.

I have a lot more power than you, and I'm an M6 and with 3.91's or 4.10's I'd be just about at the top of 4th at the end of the 1/4. PLUS I get 27 MPG on the highway with 3.73's.

3.73's are more than enough for any decently modded setup..with a cam and high revving combo they like to stay in the gear a little bit more......go with 3.91's if you're not planning on doing a shit ton to the motor and need to get the most out of a weaker engine with slicks and traction.

I see what ur saying but how much of a difference are 3.73's from 3.42's?
And I am planning on having lots of power so wouldnt 3.91's be even better than 3.73's?
i Thought about 3.73's because I didnt want to lose much on the highway but my friend has 4.10's and didnt lose much at all!

A HUGE DIFFERENCE I found that out when racing a stock geared GTO with almost 500 HP and I was side by side with him.

If you're planning on "lots of power" it depends on what method you're going but I know my heads/cam combo likes to stay in the RPMs and 3.91's would have me shifting into 5th way before I needed to. With 3.73's I actually have a tractionable 1st and 2nd and then have very useable 3rd 4th and 5th is just an extra power gear for the most part.

You're friend must have a camaro or the extremely new 4.10's for the GTO....if thats the case it sounds like you've bit into the whole "don't fear the gear" mentality. Just do your research and your math and choose the right gear for your setup and goals....although without your motor setup that might be kind of hard.

Also keep in mind the GTO came with a "close ratio" transmission....meaning our transmission gears are shorter then a camaro or firebirds....they did this because the GTO weighs more and needs a little bit extra help getting the power to the ground the way everyone wanted.... Everyone says 3.91's are the way to go for M6's but the heads/cam cars I know with them have basically unuseable 1st and 2nd gears unless they are a drag orientated setup. 3.73's are the perfect in between, and in my experience my setup is better for 3.73's.

well im def gonna have to think about this because Im gonna be a h/c/i car for sure and I dont want a unusable 1st and 2nd oh and also this is my DD :D

I am heads/cam/intake/full bolt-ons, built suspension etc etc.... 3.73's are definitely the best for my combo and like I said I'm still pulling 27 on the highway.

I am heads/cam/intake/full bolt-ons, built suspension etc etc.... 3.73's are definitely the best for my combo and like I said I'm still pulling 27 on the highway.

Thats real good mpg gears are kinda exspensive so I wanna make sure I get the right ones the first time!

Does any one have TALLER gears? For example 3.07s or something close? Also who sells taller gears?

Taller gears came in lesser model cars in australia....if you call difftechnics they practically give away those gear sets.

Taller gears came in lesser model cars in australia....if you call difftechnics they practically give away those gear sets.

Solid thanks for the tip.

I've got a set of 3.91 gears in stock and I'll have a set of the 4.10's in a few days if anyone is looking for a set.

THanks
Chris

I've got a set of 3.91 gears in stock and I'll have a set of the 4.10's in a few days if anyone is looking for a set.

THanks
Chris

I'll be getting a set of 3.91's soon just cant right now!

"Dont fear the gear" LOL Thats a good one... With 3.91s yes 1st and 2nd spin easier.. With an M6 i dont see why anyone would bother with 3.73s... And for the track with a 26 inch tire and 3.91s I have traped 123.5 with plenty of room to rev it out more.. Now I switched tires to a 28 inch and the 3.91s just arnt enough gear to get her movin.. 6,300rpm clutch dump gave me a 1.51 60' that felt grat but when I watched the vid back the car was boging off the line... Moral of the story .. I just ordered some 4.10s Woot Woot

Oh 22.8 MPG Highway with the gears and a stroker

I've got a set of 3.91 gears in stock and I'll have a set of the 4.10's in a few days if anyone is looking for a set.

THanks
Chris

^^^ Cant wait to get mine in.. Thanks again Man

"Dont fear the gear" LOL Thats a good one... With 3.91s yes 1st and 2nd spin easier.. With an M6 i dont see why anyone would bother with 3.73s... And for the track with a 26 inch tire and 3.91s I have traped 123.5 with plenty of room to rev it out more.. Now I switched tires to a 28 inch and the 3.91s just arnt enough gear to get her movin.. 6,300rpm clutch dump gave me a 1.51 60' that felt grat but when I watched the vid back the car was boging off the line... Moral of the story .. I just ordered some 4.10s Woot Woot

Oh 22.8 MPG Highway with the gears and a stroker



^^^ Cant wait to get mine in.. Thanks again Man

damn not bad even though its my dd so I wont be dumping the clutch at 6k lol and I will prolly only have dr's on the car im still going with 3.91's since its a m6

damn not bad even though its my dd so I wont be dumping the clutch at 6k lol and I will prolly only have dr's on the car im still going with 3.91's since its a m6

My DD tooo.. 69500 miles on my GTO so far :)

I could tell you a ton of reasons to go with 3.73's lol.

My DD tooo.. 69500 miles on my GTO so far :)

lol ya i have 38700 on mine but I dont wanna take the chance on breaking anything,dont have the money right now to be fixing shit lol

I have been one wheeling it for a while - the passenger side of the differential is all fubar. But it happens when you race the car a lot.

So we are going to change gears when it is opened up in a few weeks up at Rocksand Racing. Going to try the 3.91's first with a true track in her. See how it runs at the track.

But my car is strictly a car that drives to the track, makes a few runs and then heads home. With minor other weekend driving. So gas milage is not an issue to me.

Since I have some spare 17inch stock wheels - may just buy a set off 28' MH drag radials and see which runs better the MT 26 inch Street ET's or MH's 28 inchers.

Steve