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TH-700R4 QUESTION

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by AK-5GUY, Mar 30, 2003.

  1. AK-5GUY

    AK-5GUY Registered Member

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    I have a 1987 K5 with a 350 TH700 and np 208 with 134,000 miles on it. It has been stock since the day the previous owner bought it. I am putting on either 35's or 37 inch tires, and a 14 ff. How strong is my 700? How long do they usually last? Will the bigger tries kill it, or will the 4.56 gears I am putting in help? I have heard both good and bad, but I just need some clearing up. Thanks.
    Harrison
     
  2. angrysnowplow

    angrysnowplow 1/2 ton status

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    I would NOT recommend 3.42's and 35-37's with your tranny. Just wait until the gears are changed and get the biggest tranny cooler you can find. /forums/images/graemlins/thumb.gif
     
  3. Monster

    Monster Registered Member

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    My 700-R4 tranny blew up because i had 35" tires with 3.42 gears. If you put 4.56 gears in and have a good tranny cooler your 700-R4 will thank you for it. /forums/images/graemlins/grin.gif

    DO NOT!!!! put oversized tires on without changeing your gears or the tranny will be destroyed!!!!! /forums/images/graemlins/angryfire.gif

    <font color="red"> 86 K5,6 inch lift,35Bfg,Hotted 700-R4,4.56,300Hp,Empty Wallet </font> /forums/images/graemlins/tongue.gif
     
  4. DukeBoy88

    DukeBoy88 1/2 ton status

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    My 700 made it to 70,000 I bought it at 65,000. don't know what the previous owner put it through. My rebuild has lasted over 85,000 with proper gears and cooler. Its done well so far, It gets abused from time to time, I just don't do anything "really" stupid anymore.
     
  5. AK-5GUY

    AK-5GUY Registered Member

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    With the silverado and towing package, in my glovebox where the options list is, what exactly does it mean by "heavy duty towing transmission?" Does this mean a more stout tranny or cooler, or just the th 700? Thanks for all of the help!
    Harrison
     
  6. outlaw612

    outlaw612 1/2 ton status

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    Im running 36's and 4.56's with my 700/208 and love it. I do wish I had gone with 4.88's and 38-39.5's though. /forums/images/graemlins/crazy.gif
     
  7. AK-5GUY

    AK-5GUY Registered Member

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    I'm going to run 35's with 4.56's for a while. After that, I hope to step up to some 37 or 38.5's. /forums/images/graemlins/thumb.gif Thanks for the input.
    Harrison
     

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