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Thread: Speedo gear choices....

  1. #11
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    I changed the drive gear on the output shaft of the T5 in my Coupe to a black 6 tooth. I did this to give me a better range to drop back in gear or move up in gear in the rear end and with tire changes. It is not hard to change and you can do it in the car if needed but its not fun...been there done that. Last time I pulled the T-5 it took a day to R&R it and change the gear.

  2. #12
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    Quote Originally Posted by thunderjet302 View Post
    This would work as well, since our cars have electric speedometers: https://lmr.com/item/M4209ADPTAC/94-...-M-4209ADPT-AC

    Pricey fix though.
    Or this will work. More cost less effort though
    '88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, Edelbrock 70mm TB, 76mm C&L MAF, 30lb injectors, 2.5" exhaust, AOD with 2800 PI converter, 8.8 with 3.73 gears, 31 spline Traction-Lok, 31 spline Moser axles, 04 Cobra front arms, Maximum Motorsports extreme duty rear arms, subframes.
    '11 Focus, '12 Mustang 3.7, '17 Accord EX-L V6

  3. #13
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    Pretty sure I ran the 23t gear on my 3.73 swapped v6 car, and the speedo was a bit off but not enough to matter. I put ~30k miles on the car that way without the gear tearing itself up, but seeing the speed sensor now the teeth were starting to fracture at the root of the flank.

  4. #14
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    23 tooth gear has been ordered. Updates when I get it.
    '88 Sport--T-5,HURST shifter,TMoss GT-40 intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,70mm t-body,3G,mini starter,Taurus fan,BBK headers,O/R H-Pipe, Flowamaster 40's, deep and deeper Cobra R wheels,Mass Air, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

  5. #15
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    I have the 23 tooth in my car, no issues so far. It just reads a little "off".
    Mike

  6. #16
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    I just got the gear today. I'll install it as soon as I can and report the results
    '88 Sport--T-5,HURST shifter,TMoss GT-40 intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,70mm t-body,3G,mini starter,Taurus fan,BBK headers,O/R H-Pipe, Flowamaster 40's, deep and deeper Cobra R wheels,Mass Air, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

  7. #17
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    If you're dumb when it comes to drivetrain like me, try this Speedo Gear Calculator... just for future reference.

    https://lmr.com/products/Mustang-Spe...ear-Calculator
    '88 Thunderbird LX 5.0
    Engine: FR B303 cam, GT40P heads w/ Trickflow valve springs, Explorer upper/lower intake, SR cold air intake w/ MAF
    Exhaust: shorty headers, BBK O-R X-pipe, glasspacks turned down
    Misc: 8.8 rear, Saleen SC replicas 17x8/17x10, Mach 1 front springs/SN95 rear springs

  8. #18
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    I've been running the auto trans 23 tooth gear Late Model Restoration sells for my Thunderbird for several years. It seems to be working fine. I'm probably going to go with the FRPP speedo recalibrator I linked in the future so I can run a 21 tooth gear.
    '88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, Edelbrock 70mm TB, 76mm C&L MAF, 30lb injectors, 2.5" exhaust, AOD with 2800 PI converter, 8.8 with 3.73 gears, 31 spline Traction-Lok, 31 spline Moser axles, 04 Cobra front arms, Maximum Motorsports extreme duty rear arms, subframes.
    '11 Focus, '12 Mustang 3.7, '17 Accord EX-L V6

  9. #19
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    Quote Originally Posted by thunderjet302 View Post
    Or this will work. More cost less effort though
    I'm not sure that would work for our cars?
    Mike

  10. #20
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    Quote Originally Posted by mcb82gt View Post
    I'm not sure that would work for our cars?
    It will. We have a VSS speedometer, like 94 and up Mustangs.
    '88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, Edelbrock 70mm TB, 76mm C&L MAF, 30lb injectors, 2.5" exhaust, AOD with 2800 PI converter, 8.8 with 3.73 gears, 31 spline Traction-Lok, 31 spline Moser axles, 04 Cobra front arms, Maximum Motorsports extreme duty rear arms, subframes.
    '11 Focus, '12 Mustang 3.7, '17 Accord EX-L V6

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