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Old 11-20-2015, 01:20 PM
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Old 04-30-2009, 10:34 AM   #1
JasperGT
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Default TR-3650 gear ratios?

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?
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Old 04-30-2009, 10:54 AM   #2
Nuke
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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.
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Old 05-02-2009, 01:04 PM   #3
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I've seen those numbers on other forums.

Thanks Nuke!
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Old 05-02-2009, 01:22 PM   #4
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i think the auto has a 5th gear ratio of .67, the manual has a .62?
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Old 05-02-2009, 02:33 PM   #5
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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.

Last edited by Nuke; 05-02-2009 at 02:37 PM.
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Old 05-03-2009, 11:12 AM   #6
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Old 05-04-2009, 10:19 PM   #7
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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.
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Old 05-05-2009, 12:54 PM   #8
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Default Gear Chart

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.
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Old 04-23-2012, 05:48 AM   #9
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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

Last edited by wayne613; 04-23-2012 at 05:53 AM.
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Old 04-23-2012, 08:27 AM   #10
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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.
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