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Late Model
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  1. #1
    Authorized Vendor SPeace-ATL's Avatar
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    Default Things that kill a TR3650:

    These are my personal/professional opinions and are based on experience and observations:

    #1 Using Royal Purple fluid

    This stuff gets good reviews on various forums, but nobody seems to connect the premature failure of their synchro rings to the type of fluid they have been using. When I tear down a TR3650 that has the purple fluid residue the rings are shot and the bearings are pretty much worn as well. the top recommended fluds are 3.0 Liters of Mercon-V or Mobil-1 Multi-Vehicle Synthetic ATF. Ignore filling it to the fill plug. Drain it and install 3.0 Liters (3.2 quarts) of the proper fluid.

    #2 Accidentally hitting reverse while aiming for fourth gear while going down the road.

    There is no reverse lockout on a TR3650. There is an interlock that won't allow you to shift straight out of fifth into reverse, but you can come across from any other gear at highway speed and hit reverse. This destroys the reverse synchro slider by "laying over" the small engagement teeth on the slider. Often that damaged slider then gets stuck, or becomes hard to get in and out of reverse or fifth gear.

    #3 Never checking or changing the fluid in the transmission.

    This is particularly bad on the bearings. The fine metal particles in the fluid build up and speed up the wear on the bearings turning everything black inside and coated with a carbon build-up. Besides, if you have a slow leak, you may not run out of fluid since you are refilling it regularly.

    #4 Beefing the engine up to over 500 HP and not upgrading to the stronger 26 spline input shaft.

    The stock input shafts tend to wring off at about 500 hp on the engine... Once this shaft is upgraded, the next weakest point is third gear.

    #5 Installing an aftermarket shfter with improperly adjusted shifter stops.

    Aftermarket shifters are great, but there is no need whatsoever for adjustable shifter stops on a TR3650 because the internal stops that are built in the transmission are absolute. Adhustable stops won't hurt anything if they are adjusted right, but if the adjusting nut comes loose, or the adjustment is set wrong, it can keep the transmission from fully engaging a gear. When partially engaged, it will pop out of gear, or damage the synchro.

    #6 Ignoring a major vibration at high speeds

    Something seems to go wrong with the drive shafts of cars with TR3650 transmissions that make them go way out of balance. This results in a huge vibration. The tail housing is weak on a TR3650 and will eventually crack. In some cases it actually snaps the output shaft. If you get high speed vibrations, get it checked promptly.

    #7 Don't put RTV down the bolt holes when reinstalling the shifter

    I find lots of the shifter bolt holes to be stripped out. One factor is, of course, that the bolts are easy to start cross-threaded, but people think it will leak if they don't put RTV in the bolt holes. There is even a how-to video from a major aftermarket shifter manufacturer showing to put RTV down the bolt holes. Well, with the cavity full of RTV the bolts tend to strip out the threads in the casting. In one case, I believe the person must have forced them in using an impact wrench. They managed to actually SPLIT OUT the casting material adjacent to three of the four shifter bolts!
    Last edited by SPeace-ATL; 06-04-2015 at 09:51 AM.
    - Stan -


    Mustang 5-Speed Specialists - Authorized Distributor for Astro Performance products!
    Offering quality rebuilt T-5, T-45, and TR3650 transmissions in Atlanta

  2. #2
    Proud American Mustang Leo's Avatar
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    Default

    Great write up
    Nothing Finer than a Roll Tider in Carolina
    LEO
    89 GT Stolen, Recovered, Recycling-- SOLD
    84 LX vert --- SOLD
    92 lx Vert-- Wife's ride buil with my stuff. LOL!!!!
    91 F150 4x4 shortbed 306 --- SOLD
    85 GT TTop --- Terminated Project

  3. #3
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    Good info!!
    Alex
    1990 LX
    1997 SS S10

  4. #4
    Authorized Vendor SPeace-ATL's Avatar
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    Default

    ADDED NUMBER 7:

    #7 Don't put RTV down the bolt holes when reinstalling the shifter

    I find lots of the shifter bolt holes to be stripped out. One factor is, of course, that the bolts are easy to start cross-threaded, but people think it will leak if they don't put RTV in the bolt holes. There is even a how-to video from a major aftermarket shifter manufacturer showing to put RTV down the bolt holes. Well, with the cavity full of RTV the bolts tend to strip out the threads in the casting. In one case, I believe the person must have forced them in using an impact wrench. They managed to actually SPLIT OUT the casting material adjacent to three of the four shifter bolts!
    - Stan -


    Mustang 5-Speed Specialists - Authorized Distributor for Astro Performance products!
    Offering quality rebuilt T-5, T-45, and TR3650 transmissions in Atlanta

  5. #5
    Super Moderator NC STANG GUY's Avatar
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    Quote Originally Posted by SPeace-ATL View Post

    #4 Beefing the engine up to over 500 HP and not upgrading to the stronger 26 spline input shaft.

    The stock input shafts tend to wring off at about 500 hp on the engine... Once this shaft is upgraded, the next weakest point is third gear.

    Oops.. so 482rwhp/507 rwtq probably is.doing my 3650 no good?

    Billy

    90 LX coupe 427ci/T-trim@8psi 726rwhp/625rwtq...whats next?
    93 LX calypso hatch....holding down the floor in the garage for 14+ years..
    99 Cobra vert w/ a 03 swap and solid rear 482rwhp/507rwtq

  6. #6
    Authorized Vendor SPeace-ATL's Avatar
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    Quote Originally Posted by NC STANG GUY View Post
    Oops.. so 482rwhp/507 rwtq probably is.doing my 3650 no good?
    The stock 10-spline inputs will tend to twist, or even shear off on a hard shift with a stage 3 clutch and tires that stick. This is true for all of the Ford T-5, T-45, T-56 and TR3650 transmissions.

    A twisted input is hard to diagnose. When twisted, the clutch disk can't slide freely on the shaft. When the pressure plate is released, the disk is still against the flywheel and you have to fight it to get it in gear at stop light. Another clue is that it doesn't do this all the time... When the shaft shears off, well, no matter what gear you are in, it is neutral...
    - Stan -


    Mustang 5-Speed Specialists - Authorized Distributor for Astro Performance products!
    Offering quality rebuilt T-5, T-45, and TR3650 transmissions in Atlanta

  7. #7
    Super Moderator NC STANG GUY's Avatar
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    What kind of money are you talking for a 26 spline input shaft installed?

    Billy

    90 LX coupe 427ci/T-trim@8psi 726rwhp/625rwtq...whats next?
    93 LX calypso hatch....holding down the floor in the garage for 14+ years..
    99 Cobra vert w/ a 03 swap and solid rear 482rwhp/507rwtq

  8. #8
    Authorized Vendor SPeace-ATL's Avatar
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    Quote Originally Posted by NC STANG GUY View Post
    What kind of money are you talking for a 26 spline input shaft installed?
    They have been prety hard to get lately, but I do have some coming! I will send you a PM.
    - Stan -


    Mustang 5-Speed Specialists - Authorized Distributor for Astro Performance products!
    Offering quality rebuilt T-5, T-45, and TR3650 transmissions in Atlanta

  9. #9
    SEFB Treasurer 1992vert's Avatar
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    Great topic and awesome write-up Stan!!
    -Troy "Get The Fox Out!"
    1992 LX Vert



  10. #10
    Authorized Vendor SPeace-ATL's Avatar
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    Quote Originally Posted by 1992vert View Post
    Great topic and awesome write-up Stan!!
    There are lots of other things that happen, but I'm just listing the ones that are caused by things the owners do to their cars, or that could have perhaps been prevented.

    Many of these things apply to the T-5 and T-45 as well.
    - Stan -


    Mustang 5-Speed Specialists - Authorized Distributor for Astro Performance products!
    Offering quality rebuilt T-5, T-45, and TR3650 transmissions in Atlanta

  11. #11
    Member crumbie's Avatar
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    Default

    i love reading these write ups.

  12. #12
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    O nice


    Sent from my iPhone using Tapatalk

  13. #13
    Member blown03hd's Avatar
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    Would this cause a vibration over 70 MPH? LOL, been trying to figure this one out for months. 3550 though.

  14. #14
    Authorized Vendor SPeace-ATL's Avatar
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    Drive line vibrations at high speed are usually the drive shaft, u-joints, or, of course , a wheel out of kilter.

    The inside of the transmissions don't usually get out of balance unless the output shaft gets bent.
    - Stan -


    Mustang 5-Speed Specialists - Authorized Distributor for Astro Performance products!
    Offering quality rebuilt T-5, T-45, and TR3650 transmissions in Atlanta

  15. #15
    Member 92notch's Avatar
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    I have Sam at OTP getting ready to chase a vibration over 80MPH... Coming right up through the steering wheel.



    Sent from my iPhone using Tapatalk
    Rob - Charlotte, NC
    1992 Notchback T-Top
    5.0, 5 speed
    Vortech SCi V3 Supercharger
    437hp/416tq @ 13#'s of boost



  16. #16
    Authorized Vendor SPeace-ATL's Avatar
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    These vibrations can be almost anything, but if it is in the drive shaft it can cause a real problem with the TR3650
    - Stan -


    Mustang 5-Speed Specialists - Authorized Distributor for Astro Performance products!
    Offering quality rebuilt T-5, T-45, and TR3650 transmissions in Atlanta

  17. #17
    Member blown03hd's Avatar
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    Well thats good to know that it probably isn't anything in the case. Thanks.

    Wish i was closer, would run it down to you.

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