Tremec Gear Ratios

BigJohn · #1 (**permalink**) 10-27-2002, 10:49 PM

I bought a Cobra with a 3:70 rear end and Tremec 5 spd.. How can I tell what gear ratios are in the box? Are there ID numbers on the case? If no ratios were specified when the box was purchased, what gears will it come with?
Thanks,
BigJohn

Jeff Frigo · #2 (**permalink**) 10-28-2002, 03:57 AM

3.27, 1.98, 1.34, 1.00, .68. These numbers are for the 3550 and the TKO. The TKO II uses a .83 overdrive. Not very common. Jack the rear end up, mark the drive shaft, put the car in 5th. gear, and rotate the engine by hand (with a breaker bar) 2 full revolutions. Have somebody underneath the car to count the number of revolutions the drive shaft makes. If it is slightly under 3 revolutions, you have a 3550 or TKO. If it rotates slightly under 2.5 revolutions, you have a TKO II, which has only been around for about 1 year, more expensive, thus making it kind of rare.

While you are at it, put the car in 4th gear, mark the tire, and see how many revolutions of the engine it takes to rotate the tire one time. This will tell you what your rear end gear is.

BigJohn · #3 (**permalink**) 10-28-2002, 08:57 PM

Jeff,
This is excellent and invaluable information. The solution to determining the ratios was just too straightforward and simple.
Thanks a 3.27 million!
BigJohn

Jeff Frigo · #4 (**permalink**) 10-28-2002, 10:31 PM

BigJohn:

Any time. Welcome to CC.

Mike48 · #5 (**permalink**) 10-28-2002, 11:59 PM

How about the OD ratio for the World Class T-5? I hear everyting from .68 to .76. Anyone know for sure?
TIA, Mike

mikiec · #6 (**permalink**) 10-29-2002, 02:22 AM

Try here:

http://www.geocities.com/MotorCity/D...66/t5data.html

http://79indypace.stangnet.com/swap.htm#table

Hope this helps..

Mike

Jack Zupan · #7 (**permalink**) 10-29-2002, 04:25 AM

Try this for the gear ratios.

http://www.ttcautomotive.com/products/TR-3550.asp

Jack Z.