Different versions of TR3650

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01TrueBlueCobra

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Feb 16, 2004

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#1

• Jul 20, 2004

• #1

I was reading a TR3650 rebuild guide and noticed there is more than one version of it. 1st - 4th gear are the same gear ratio but 5th gear. It seems like all the Mustangs have a .67 5th gear ratio and the other version had a .62 ratio. My question is can I put the .62 gear ratio in my Cobra so I can run steeper gears and not kill my Highway gas mileage

 

Mustang5L5

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Feb 18, 2001

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Jul 20, 2004

#2

• Jul 20, 2004

• #2

if you can find an 0.62 drive ratio.

I have not messed around with the T-3650 other than looking in the service manual. But the 5th gear design does look very similar to the T-5's which will allow you to swap OD's. But i am not sure if there are any specific difference in the parts.

 

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01TrueBlueCobra

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#3

• Jul 20, 2004

• #3

Mustang5L5 said:

if you can find an 0.62 drive ratio.

I have not messed around with the T-3650 other than looking in the service manual. But the 5th gear design does look very similar to the T-5's which will allow you to swap OD's. But i am not sure if there are any specific difference in the parts. Those tranny's with the 0.62 OD ratio also have an increased torque rating of 390 f-lbs.

I'd be more interesting in landing the entire transmission, not just 5th gear

Click to expand...

I was looking in the Corral forum and found out that the Mach 1's TR3650 has a .62 overdrive ratio due to the 3.55 gears

 

stangman

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Jul 10, 2003

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Jul 20, 2004

#4

• Jul 20, 2004

• #4

this has me very interested, cause i put 4.10's in a short while ago, & my rpms are much lower than i expected. on my last gt they were higher i know. it had me so confused i got underneath the car to turn the driveshaft to make sure i had 4.10's. i guess this answers my questions about it

 

Mustang5L5

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#5

• Jul 20, 2004

• #5

According to tremec's site, there are 6 versions of the T-3650.

1 is a heavy duty 5000lb GVWRD version, so i doubt that would go into the Mustang.

Another has a 390 ft-lb torque rating with a 0.68 OD for a 4000lb vehicle

That leaves 4 T-3650's that would most likely go in the Mustang.

Only 1 has the 0.68 OD ratio, while three have the 0.62 OD ratio.

The thing is, which trans goes in which car? I'm assuming several of the T-3650's are update trans. But being that the 0.62 OD trans looks like it may have been revised a few times, one would think it was the GT trans?

Where on the T-3650 is the Buck Tag so we can see which of those trans go to which vehicles/

 

Marks5.0!

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#6

• Jul 20, 2004

• #6

01TrueBlueCobra said:

I was looking in the Corral forum and found out that the Mach 1's TR3650 has a .62 overdrive ratio due to the 3.55 gears

Click to expand...

i was wondering why i turned the same rpm at 70 with the 3.55's as i did with my old 00gt with 3.27's

 

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01TrueBlueCobra

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#7

• Jul 21, 2004

• #7

Does anyone have any info in where I can purchase this overdrive gear.

 

XtorT'r

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Jun 11, 2003

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Jul 21, 2004

#8

• Jul 21, 2004

• #8

01TrueBlueCobra said:

I was reading a TR3650 rebuild guide and noticed there is more than one version of it. 1st - 4th gear are the same gear ratio but 5th gear. It seems like all the Mustangs have a .67 5th gear ratio and the other version had a .62 ratio. My question is can I put the .62 gear ratio in my Cobra so I can run steeper gears and not kill my Highway gas mileage

Click to expand...

I thougt the cobras all had t-45's.. not including 03+. Guess I was wrong

 

M

moreause

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Dec 24, 2003

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Jul 21, 2004

#9

• Jul 21, 2004

• #9

i have a 2002 gt and my 5 is 0.62 and i would gladly change it for a 0.74 when i want to accelerate...sorry was used to a t-56 in my old camaro...that is almost the same as in the new mustang cobra.


for a od change i think for the price and jobs it will be easyer to change the transmision but if you are doing this i think you should go with a t-56 6 speed when you try one you need one.

i tried to find some info on the tremec if they were 0.67 one days and 0.62 the next. the only thing i have found is both one days is 0.67 and the other is 0.62 but for sure mine is 0.62

 

Mustang5L5

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Jul 21, 2004

#10

• Jul 21, 2004

• #10

XtorT'r said:

I thougt the cobras all had t-45's.. not including 03+. Guess I was wrong

Click to expand...

'99's had the T-45

'01's had the T-3650