low gear reduction with 3.91 sure grip

Discussion in 'Transmission and Drivetrain Tech' started by 44070dart, Jan 3, 2019.

  1. 44070dart

    44070dart Well-Known Member

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    Looking to go and see a B-body out of town that has a 727 and this low gear reduction added to trans. What is the story with this addition. Drove with spliters on standard shift vehicles but not any automatics. Good/bad
     
  2. AJ/FormS

    AJ/FormS 367 FormS clone 3.09-1.92-1.40-1.09-.78od 3.55s

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    You mean a transfer case? lol
    or an A518?
     
  3. 44070dart

    44070dart Well-Known Member

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    as I described in the ad " 318 magnum and trans with low gear reduction and 3.91 sure grip" ....? .. I haven't spoke to him yet
     
  4. rumblefish360

    rumblefish360 so close yet so far away

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    I think he means the 727 was given a lower first gear ratio.

    I would liken it to something like, turning the 3.91 gears into 4.30’s or 4.56’s for the duration of first gear. I would need the actual normal first gear ratio as well as the replaced gears ratio to figure out what the new feel ratio would feel like. After you get done with 1st gear, it is back to the normal 2/3 ratios and it drives like it should.

    This is done by racers and serious street strip guys that want to get moving off the line quicker. Remember that most races are won and lost at the starting line. Those first few moments matter but time.
     
    • Agree Agree x 1
    • RustyRatRod

      RustyRatRod Just another dumbass. FABO Gold Member

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      He may be talking about several things, who knows? The Torqueflites were available with standard and low first gears. He might be talking about one of the overdrives. Might be talkin about an add on of some sort. Just go look at it and see. If you don't know, how do we know? lol
       
    • CudaFactHackJob

      CudaFactHackJob Well-Known Member

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      Maybe a 904 with the low first? But low first also gives a reduction in second.
       
    • fishy68

      fishy68 Tyr Fryr's Inc. FABO Gold Member

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      Never saw a low gear reduction unit for a 727 or 904. Maybe a Gearvendors over drive add on??
       
    • oldkimmer

      oldkimmer Well-Known Member

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      727 gear ratio’s. 2.45, 1.45 and 1.00. The low gear set is 2.77. His gear reduction may very well be an overdrive. Kim