Best Gears for 03 Cobra

[mike302]

what would be the best gears to go with???

im looking to go up to 580-630ish RWHP in the future

I was may be thinking 3.90s???

What do you guys think and recomend

 

[jessie jaramill]

i have true forged ported ,why so low #.i want to install a 4#lower to get 500 plus rwhp & trq. on 91

 

[mike302]

I don't know I wonder about those low #s my self I expected more!

 

[Posi]

3.55's!

 

[mike302]

Im going to re-build my rear end!!!

Ever since I snaped my right half shaft my car has been making noices from the rear end!!! I went with level 5s and changed the outer bearings and it still makes noice???

 

[Trick Pony]

At that power level you probably don't need any more gear than stock. With what you should trap with that kind of power you would be shifting into 5th if you ever ran the 1/4 and it will be harder to make traction than stock gears too.

 

[mike302]

what about some 3.73s???

 

[mike302]

Im taking my car in tomorrow to get the rear end rebuilt and I hear a annoing whining noise in the rear end!!! and could be damaged gear ring or pinion!!!

 

[Posi]

I wouldn't think that 3.73's would be to much gear. Plus if you have the rearend out anyways. Keep in mind whap mph you might end up trapping sooner or later with your car though and what rpm's you'd be going through the traps at. That's why I'm staying with 3.55's.

 

[Juruense]

3.55

 

[03cobramanIII]

i got 3.73 right now. im glad they didnt stock the 3.90 s or i would have got them , i'am glad they didnt now 3.90s so too much. i liked the feel or to longer pull though the gears with the 3.55s the 3.73s you got to shift alot quicker when you spinning and got no traction. i think 3.27s would be a good street gear. it be better on those 70mph down shift into 4th gear stabs to pass, on the interstate of course!

 

[boosted_truck]

I have 3.90's right now at just over 500 whp and traction is an issue. After the Whipple goes on it's going to be rediculous.

 

[04SLOBRA1]

stay with the 3 55 3 73 wouldn't make much of a difference.

 

[mike302]

Should I go with Solid axles??? MY whole Rear Diff. is done/through the housing and everything inside gears, bearings, etc.

 

[03cobramanIII]

2.73s that would be a great salt flat gear!

 

[wheelhopper]

I personally prefer the stock 3.55's. It is a great all around gear. Also, with the torque that our cars make, more than 3.55's is just not necessary, especially when you start heavily modifying.

 

[mike302]

I just stayed with 3.55s

 

[9746Cobra]

For that much power I'd probobly get 3.73's if I was replacing gears anyway.

Anything more is too much for your power level.

 

[I SUCK!]

I would go with 4:10 s my self. 3. 2. 1. BLAST OFF. well thats what it would feel like

 

[Dirk]

I had 4.10s and 3.73s in my '99 Cobra.
For me 4.10s would be to much on the '03 Cobra, 3.73's sounds good to me but traction will be a problem.