Gears, What to go with?

**Smallville** · 03-18-2007, 10:49 AM

Swapping a T56 into my '99 cobra. I have run 4.10's with the T45 but now having the closer ratios, I am wondering if it is gonna be too much gear. Since the diff is coming out to get resealed and a new pinion flange, I'm pulling out the 3.27s. Deciding whether to go back to the 4.10s or run 3.73s?

ALL YOU TERMINATORS........... Any of you swapped out the 3.55s?

**Pure Stock** · 03-18-2007, 11:35 AM

Originally Posted by Smallville

Swapping a T56 into my '99 cobra. I have run 4.10's with the T45 but now having the closer ratios, I am wondering if it is gonna be too much gear. Since the diff is coming out to get resealed and a new pinion flange, should I be swapping down to 3.73s?

ALL YOU TERMINATORS........... Any of you swapped out the 3.55s?

Keep the 4.10's.

**5k#Eaton** · 03-18-2007, 11:59 AM

Burnouts

**wick** · 03-18-2007, 12:43 PM

Originally Posted by 5k#Eaton

Burnouts

I know you have another one for burnouts.

**INSANELY CRAZY** · 03-18-2007, 12:43 PM

410's hell yea !!!

**GOT SVT** · 03-18-2007, 01:09 PM

Originally Posted by Pure Stock

Keep the 4.10's.

agreed

**u1arunit** · 03-18-2007, 02:04 PM

Originally Posted by Smallville

ALL YOU TERMINATORS........... Any of you swapped out the 3.55s?

I went to 4.10's for short time but traction was absolutely non existant at my level of power. I was spinning the drag radials with 16# of air in them from 50+mph rolls. I decided to go back to 3.55's. I do think that 3.73-3.90 is the ideal gear chioce for a Terminator with 500+ RWHP but 3.73's are too close to stock to change and the 3.90 ratio isn't available in Ford gears.

**383taman** · 03-18-2007, 02:33 PM

Right fms dont make 390 but us gear or strange makes very good ones.

Originally Posted by u1arunit

I went to 4.10's for short time but traction was absolutely non existant at my level of power. I was spinning the drag radials with 16# of air in them from 50+mph rolls. I decided to go back to 3.55's. I do think that 3.73-3.90 is the ideal gear chioce for a Terminator with 500+ RWHP but 3.73's are too close to stock to change and the 3.90 ratio isn't available in Ford gears.

**sutyak** · 03-18-2007, 04:41 PM

Smallvile what kind of power are you at, and are you gearing for general fun or for the track?

I ran a 4.56 in my Mach 1 and LOVED it!

If your Cobra is not supercharged I'd stick with your 4.10.
Of course if you didn't have the 4.10 already I'd go with a 4.30 or 4.56 depending on your rpm going through the traps. :)

**Smallville** · 03-18-2007, 04:58 PM

More into the "fun" factor of it, but I don't want the 3,000+rpm highway cruise. Little track time, moreso when everyone else is there that I have something to run.

Originally Posted by sporadic

Smallvile what kind of power are you at, and are you gearing for general fun or for the track?

I ran a 4.56 in my Mach 1 and LOVED it!

If your Cobra is not supercharged I'd stick with your 4.10.
Of course if you didn't have the 4.10 already I'd go with a 4.30 or 4.56 depending on your rpm going through the traps. :)

**Smallville** · 03-18-2007, 09:23 PM

anymore opinions?

**Rodeheaver's** · 03-19-2007, 01:04 PM

3.73 ftw, you want to keep it in 3rd gear through the traps...

**FineLineMtrSprt** · 03-19-2007, 01:44 PM

My buddy runs 4.10's in his 96 GT Saleen replica with a 10lb blower and a T56 swap....and they dont rev nearly as well at Cobras as well all know....i would keep the 4.10's