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Thread: T45 vs. T3650

  1. #1
    Crazy SVT Poster Stangracer44t's Avatar
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    T45 vs. T3650

    So im looking into doing a GT engine swap and I would like to know that the difference is between the T45 and the 3650, other than the 3650 started in 01.

  2. #2
    Crazy SVT Poster pbm.cc's Avatar
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    probably the gear ratios?!

    i'll google the specs.....

    here you go!


    General Specifications
    T45 Specs:
    1st gear – 3.37

    2nd gear – 1.99

    3rd gear – 1.33

    4th gear – 1

    5th gear – .67

    Reverse – 3.22



    T45 RPM rate with 4.10 gears at 70 MPH in 5th gear: 2519 RPMs

    T45 RPM rate with 4.30 gears at 70 MPH in 5th gear: 2642 RPMs



    Known Issues/Problems:
    The T45 doesn’t suffer from many problems. It does have a slight grind when cold usually and has weak shifter forks (helped with an after market shifter) but there aren’t many synchro problems involved like that of the T3650. Recommended fluid for this is any ATF blend of fluid. 3.5 quarts is needed.



    T3650 Specs:
    1st gear – 3.38

    2nd gear – 2

    3rd gear – 1.32

    4th gear – 1

    5th gear – .62

    Reverse – 3.28




    T3650 RPM rate with 4.10 gears at 70 MPH in 5th gear: 2331 RPMs

    T3650 RPM rate with 4.30 gears at 70 MPH in 5th gear: 2445 RPMs



    Known Issues/Problems:
    The T3650 seems to be the most problematic transmission of the SN95 years. It is known to have synchro issues such as grinding even when warmed up. As of 4/22/04, Ford still denies any recall on these transmissions. Recommended fluid for this is GM Synchromesh.. Also, it is recommended to use 3.2 quarts instead of the standard 3.5 quarts as called for in the T45 transmissions. There is now a Ford Service Bulletin that fixes the problems with the T3650.





    Cobra T56 Specs:
    1st gear – 2.97

    2nd gear – 2.07

    3rd gear – 1.43

    4th gear - 1

    5th gear - .8

    6th gear - .62

    Reverse – 3.38



    T56 RPM rate with 4.30 gears at 70 MPH in 6th gear: 2445 RPMs

    T56 RPM rate with 4.56 gears at 70 MPH in 6th gear: 2592 RPMs



    Known Issues/Problems:
    The T56 is the strongest Ford released transmission in the SN95 years. So far, the only problem that has occurred is the fact that Ford decided to use a 10 spline input shaft instead of a 26 spline as found in the Viper/GM T56 transmissions. This results in a weaker transmission compared to the other T56s. Any Dextron III fluid will work in this transmission.



    4R70W Automatic Transmission Specs:
    1st gear – 2.84

    2nd gear – 1.56

    3rd gear – 1

    4th gear - .7

    Reverse – 2.32



    4R70W RPM rate with 4.10 gears at 70 MPH in 4th gear: 2632 RPMs

    4R70W RPM rate with 4.30 gears at 70 MPH in 4th gear: 2760 RPMs



    Known Issues/Problems:
    I know of no known issues or problems at this time.



    * All RPM assumptions are based on if you have a 275/40/17 tire in the rear.


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  3. #3
    IDK what I want now meaty mac's Avatar
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    double post
    Last edited by meaty mac; 05-07-2008 at 06:23 PM.
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  4. #4
    IDK what I want now meaty mac's Avatar
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    Quote Originally Posted by pbm.cc View Post
    probably the gear ratios?!i'll google the specs.....here you go!
    General Specifications[B]T45 Specs:
    1st gear – 3.37
    2nd gear – 1.99
    3rd gear – 1.33
    4th gear – 1
    5th gear – .67
    Reverse – 3.22[
    /B]***[B]T3650 Specs:
    1st gear – 3.38
    2nd gear – 2
    3rd gear – 1.32
    4th gear – 1
    5th gear – .62
    Reverse – 3.28[
    /B]*Cobra T56 Specs:
    1st gear – 2.97
    2nd gear – 2.07
    3rd gear – 1.43
    4th gear - 1
    5th gear - .8
    6th gear - .62
    Reverse – 3.38
    **4R70W Automatic Transmission Specs:
    1st gear – 2.84
    2nd gear – 1.56
    3rd gear – 1
    4th gear - .7
    Reverse – 2.32
    You are off by a bit. here are the specs:
    3650
    1st-3.35
    2nd-1.99
    3rd-1.33
    4th-1
    5th-.68

    t56 (cobra spec)
    1st-2.66
    2nd-1.78
    3rd-1.30
    4th-1
    5th-.80
    6th-.63

    the automatic specs are correct
    Last edited by meaty mac; 05-07-2008 at 06:26 PM.

  5. #5
    2VORNOT2V 99MustangGTman's Avatar
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    good post


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  6. #6
    Crazy SVT Poster Stangracer44t's Avatar
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    Thanks guys. One last thing, will they bolt right across if i get an 01 engine and a T45 or is there some other parts that are needed to do this.

  7. #7
    2VORNOT2V 99MustangGTman's Avatar
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    nope it will bolt up fine, i have an 01 romeo with the t45 from my windsor

  8. #8
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    The T45 has a mechanical speedo while most 3650s are electronic speedos. Idk if the 3650 ever had a mechanical(early years). The T45 does sometimes have reverse problems but, I never had too bad of one. I learned to work around it fine.

    As far as bolting it up, I bolted one up to an 03 Cobra shortblock fine(8 bolt flywheel of course). NP at all.

  9. #9
    Nitrous junkie GT_Jim's Avatar
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    My 3650 grinds going into reverse all the time, likes to randomly pop out of 2nd gear and is generally a pain in the @** to shift. I'm looking at swapping it for a C4.
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  10. #10
    lolololololololololol VirtualSVT's Avatar
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    Quote Originally Posted by Zoie_daGT View Post
    The T45 has a mechanical speedo while most 3650s are electronic speedos. Idk if the 3650 ever had a mechanical(early years). The T45 does sometimes have reverse problems but, I never had too bad of one. I learned to work around it fine.

    As far as bolting it up, I bolted one up to an 03 Cobra shortblock fine(8 bolt flywheel of course). NP at all.


    99 and up have electrical speedo's. The T45 is years better than the 3650

  11. #11
    Crazy SVT Poster Stangracer44t's Avatar
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    Guess im going with a T45. Thanks for all the input.

  12. #12
    IDK what I want now meaty mac's Avatar
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    Quote Originally Posted by Stangracer44t View Post
    Guess im going with a T45. Thanks for all the input.
    Depending on the price, you may even want to consider a TKO
    Better than either one
    only 1700 i believe

  13. #13
    Crazy SVT Poster Stangracer44t's Avatar
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    whats the difference with the TKO?

  14. #14
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    The TKO is VERY stout. You will need a bellhousing to adapt to the engine. The clutch may also be different depending on the input shaft. 10 spline vs 26 spline. They are great trannies and I would have bought one if I had the money when I did my trans work.

  15. #15
    Crazy SVT Poster Stangracer44t's Avatar
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    I don't really have enough $$$ for that, plus I don't want to start swapping this and that around. I am going to have enough to do already with the engine swap, and i would rather just put in a factory T45 and be done with it.

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