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Drive gear TH350

Discussion in 'The Hides' started by Tripple7, Nov 19, 2020.

  1. Tripple7

    Tripple7 Well-Known Member

    Planning on doing following change to my '71 350-2 Skylark Custom : from 225/60R14 to 245/60R15 front, 275/60R15 rear..
    Do I have to change the drive gear as well or only the driven gear?
    What was the drive gear for a standard TH350 and 2.56 rear?
     
    Tripple7, Nov 19, 2020
    #1
  2. DasRottweiler

    DasRottweiler -BuickAddict-

    Use the calculator here to figure out what gear changes to drive and driven gears you will have to make based on tire height , gear ratio etc.


    https://www.tciauto.com/speedometer-gear-calculator

    If your changing tire height only, not gear ratio, changing the driven gear will get you where you need to be...

    JIM
     
    DasRottweiler, Nov 19, 2020
    #2
    Gulfgears likes this.
  3. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    I don't think there is a standard DRIVE gear. You'll need to open it up and count the teeth through the DRIVEN Gear sleeve hole. The rear tire is all that matters. The 275/60R-15 is 28" tall The stock tire size is about 26.6", so your current 225/60R-14 are 24.6" tall, so your speedometer is way off now.

    If you jack the back of the car up high, and pull the sleeve out, you can turn the driveshaft with the trans in neutral, and count the DRIVE gear teeth. The gear is helical so it isn't the easiest, but it is doable. Mark one tooth with some white grease and turn the driveshaft. Do it a few times so you get it right. You just need the three numbers. Tire height (28"), gear (2.56), and the number of teeth on the DRIVE gear. Then just pop it into the formula to get the DRIVEN gear needed.

    https://www.tciauto.com/speedometer-gear-calculator
     
    LARRY70GS, Nov 19, 2020
    #3
  4. Tripple7

    Tripple7 Well-Known Member

    Thanks Larry, wanted to avoid this procedure initially.
    Just couldn't find a specific number as for the TH400 in the manual.
     
    Tripple7, Nov 20, 2020
    #4
  5. Tripple7

    Tripple7 Well-Known Member

    Yeah, only changing Tire Size. Thanks Jim
     
    Tripple7, Nov 20, 2020
    #5
    DasRottweiler likes this.
  6. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Really no way to avoid it. If you get the back of the car up, you can avoid as much fluid loss as possible. You'll have to pull the sleeve anyway to change the DRIVEN gear. Might as well be sure.
     
    LARRY70GS, Nov 20, 2020
    #6
    Tripple7 likes this.
  7. DasRottweiler

    DasRottweiler -BuickAddict-

    DasRottweiler, Nov 20, 2020
    #7
    Tripple7 likes this.
  8. Tripple7

    Tripple7 Well-Known Member

    Ok, just finished the Job.
    Ok, just finished the Job.
    I have a 18 tooth ( green ) drive gear and a beige 35 tooth driven gear..
    According to the computation I will need a 33 tooth driven gear for my 275/60R15 Setup right? 20201121_144440.jpg 20201121_144414.jpg
     
    Tripple7, Nov 21, 2020
    #8
  9. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Yes, 33, but no such thing. 34 teeth is the closest. You can change the drive gear easy enough if you want.
     
    LARRY70GS, Nov 21, 2020
    #9
  10. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    19 and 35 will work.
     
    LARRY70GS, Nov 21, 2020
    #10
  11. Tripple7

    Tripple7 Well-Known Member

    Ok, I hate threads from wich you never hear about their outcome.Today was early christmas eve and the new wheels arrived.
    Here is before and after. I ordered a 34 tooth driven gear and hope it will get me an almost accurate 20201210_213821.jpg speed reading.
     
    Tripple7, Dec 10, 2020
    #11
    6769RIV likes this.
  12. gstewart

    gstewart Well-Known Member

    hope the white lettering remains white unlike mine which are turning brown on the rears.
    Had the new fronts replaced due to the brown letters. Replacements are staying white, so far.
     
    gstewart, Dec 13, 2020
    #12
  13. Tripple7

    Tripple7 Well-Known Member

    Mine were produced by the end of 2019. How old are yours?


    .
     
    Tripple7, Dec 13, 2020
    #13
  14. Tripple7

    Tripple7 Well-Known Member

    Is there a trick to preserve the white lettering?
     
    Tripple7, Dec 13, 2020
    #14
  15. gstewart

    gstewart Well-Known Member

    I purchased the front BFG T/A tires in early 2019. In a few months the white letters had all gone brown and would not cleanup even with toluene. I tries many other cleaners but toluene is the very strongest u can buy. With the Covid, it took until about June 2020 to have the dealer replace them. They are staying white.
    I purchased a pair for the rears Oct. 2, 2020. They, too, are going brown but I cleaned them in November & they went white, now browning.
    Other than cleaning the letters when they get dirty, there is no other maintenance required. good luck.
     
    gstewart, Dec 15, 2020
    #15
  16. Tripple7

    Tripple7 Well-Known Member

    Good to know . Will keep an Eye on it.
    The car won't drive till march so I will keep the blue coating on.
     
    Tripple7, Dec 15, 2020
    #16
  17. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    I always use a Brillo Pad on them. You have to keep them clean.
     
    LARRY70GS, Dec 15, 2020
    #17
    Tripple7 likes this.
  18. Tripple7

    Tripple7 Well-Known Member

    So finally the car is on the road again with the looks I wanted! 20210427_165113.jpg
     
    Tripple7, Apr 29, 2021
    #18

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