JasperGT

Does anyone know what the gear ratios for the Tremec TR-3650 5 speed manual transmission are for the 2005-2009 GT mustangs? I have found some ratios, but the 5th gear ratio does not seem to have a consensus. Do these transmissions have different gear ratios for the different years? Also, what is the specific Tremec part number?

These are the numbers that I have found from some other forums:

1st: 3.340:1
2nd: 2.000:1
3rd: 1.320:1
4th: 1.000:1
5th: 0.670:1
Rev: 3.380:1

Are these right?

Nuke

Here's what I have:

1st 3.38
2nd 2.0
3rd 1.32
4th 1.0
5th 0.675

Don't know about reverse.

JasperGT

I've seen those numbers on other forums.

Thanks Nuke!

AmericanMuscle4.6GT

i think the auto has a 5th gear ratio of .67, the manual has a .62?

Nuke

For the auto, I'm showing:

1st 3.22
2nd 2.29
3rd 1.54
4th 1.00
5th 0.71

And, of course, I found another spreadsheet with slightly different #'s for both. Sheeesh.

BruceH

A link to the Tremec website: http://www.ttcautomotive.com/English...ts/TR-3650.asp

SlideWRX

Some previous model year Mustangs have the 0.62 5th gear. We have 0.675. I'd like to have the 0.62 to save some gas on highway mileage.

bynumj

I have an excel chart that has the gears for 05+ auto, 5-speed, and 6-speed; it will also calculate RPM and MPH for the drivetrain. I need to figure out how to post it.

wayne613

Trying to get my final gear ratios down for an ODB-II program that uses all of this data to give me a decent dissection of what/how/why (Dashcommand).

So another necromancy resurrection by me...

1-4 for the revisions are the same, so no worries, but 5th just seems to be up in the air: .62 for earlier, .68 for some later in the 05-09 realm, and even .74 for some.

There a way to tell short of yanking the transmission which part # mine would have? I suppose I could just cruise in 4th, get to a set speed, then shift into 5th and calculate it out, but...

In my case, 08 GT manual. I'm guessing .68...

References:
http://en.wikipedia.org/wiki/Tremec_...0_transmission
http://www.ttcautomotive.com/English...ts/TR-3650.asp

S197GT07

Correct, the only way to really tell is to take down your tire size, and find out what rpm you are at when cruising at XXmph in 5th. I'd use a GPS to get that XXmph, not using the speedo though.