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Powercurve
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  1. #1
    Member Old Stang's Avatar
    Join Date
    Dec 2009
    Location
    Woodstock, GA
    Posts
    435

    Default TKO 600 Shift Improvemet Fix

    Hello Stan,
    I have a TKO 600 that I will be putting into my 92 LX in the Spring, it is strictly a street car and may occasionally see 6000-6200 rpm, but likely not very often.

    I have read (on the i-net) that some folks experience less-than-smooth 2-3 shifts, especially above 6000 rpm, that has been attributed to lax quality control and excessive tolerances.
    Whether this is factual or not, the TKOs have a reputation for notchy shifting.

    Is there a "fix" for this to smooth out the shifting?

    If so, is this a service you offer?

    Many thanks,
    Marc
    Woodstock, GA
    69 Mach 1 (351W-4V, auto, 4.57s) - 1st car, still have-NOT, needs redo - BUY 6/28/1979, SOLD 9/29/2012
    66 Coupe (351W, 4 spd, 3.50s) - future 2.3L Turbo project - SOLD
    90 Notch (5 spd, 3.55s, Wild Strawberry/Blk) - SOLD
    94 SHO (ATX, Green/Gray) - SOLD
    92 Notch (5 spd, CAI, 3.55s, BBK Equals, Pypes cat'd X-pipe, Flows, Emerald Green/Gray) - DD

  2. #2
    Authorized Vendor SPeace-ATL's Avatar
    Join Date
    Jul 2011
    Location
    Atlanta, GA
    Posts
    371

    Default

    Hi Marc,

    You bring up two topics with the TKO/3550 series transmissions.

    The TKO is an older transmission design using brass/bronze synchro rings. These are the tried and true rings for many many years, but they are not so smooth in shifting when compared to a T5, T45, T56 etc. There is nothing actually wrong with the shift. it just likes to be "notchy" or a little "klunky". The newer transmissions use lined rings for the synchros which will provide smoother shifting and may perform better at the higher RPMs. Custom aftermarket lined rings for these transmissions are available and might be advised if it should eventually need new rings or need to be disassembled.

    The 3-4 shift is often frustrating for those who are drag racing these transmissions. It seems that not all of them have a big issue with this and some drivers have posted that if they just shift with the palm of the hand rather than to grab the stick, the problem goes away. While Tremec has never admitted this to be an issue, There is a modification to the shift selector fingers that seems to address the issue. It involves building one of the fingers up with weld and then machining it to a different angle.

    The issue is that the selector tends to connect to two fingers at the same time which would attempt to move two shift rails simultaneously, but this action is locked out so that it cannot actually engage two gears at the same time. The result is that the shifter jams (actually a lockout) and it won't move to third gear.

    It is interesting that while Tremec still makes the TKO today, they have chosen not to offer either of these two enhancements and stick with the original design.

    Yes, this is something I can take care of.

    Stan

    Quote Originally Posted by Old Stang View Post
    Hello Stan,
    I have a TKO 600 that I will be putting into my 92 LX in the Spring, it is strictly a street car and may occasionally see 6000-6200 rpm, but likely not very often.

    I have read (on the i-net) that some folks experience less-than-smooth 2-3 shifts, especially above 6000 rpm, that has been attributed to lax quality control and excessive tolerances.
    Whether this is factual or not, the TKOs have a reputation for notchy shifting.

    Is there a "fix" for this to smooth out the shifting?

    If so, is this a service you offer?

    Many thanks,
    Marc
    Woodstock, GA
    - Stan -


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

  3. #3
    Member Old Stang's Avatar
    Join Date
    Dec 2009
    Location
    Woodstock, GA
    Posts
    435

    Default

    Stan,
    Thanks for the detailed answer.

    It was a pleasure talking with you today, will get back to you soon about scheduling a date/time to drop off the trans.
    Thanks again,
    Marc
    69 Mach 1 (351W-4V, auto, 4.57s) - 1st car, still have-NOT, needs redo - BUY 6/28/1979, SOLD 9/29/2012
    66 Coupe (351W, 4 spd, 3.50s) - future 2.3L Turbo project - SOLD
    90 Notch (5 spd, 3.55s, Wild Strawberry/Blk) - SOLD
    94 SHO (ATX, Green/Gray) - SOLD
    92 Notch (5 spd, CAI, 3.55s, BBK Equals, Pypes cat'd X-pipe, Flows, Emerald Green/Gray) - DD

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