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Should I upgrade my tranny?

Discussion in 'The Garage' started by 69K5, Nov 22, 2002.

  1. 69K5

    69K5 1/2 ton status

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    questions to go with my one ton axel buildup

    I have the original Th350 in my 69 blazer. Its in a bad state of disrepair.
    should i rebuild it or should i swap in a 700r4?

    if i swap in the 700 will i have to get an adapter for my 205?

    will the 700 bolt to my 350?

    do 700r4's have overdrive? would it help my gas mileage once its lifted?

    what is a locking torque converter?

    thanks again

    nathan
     
  2. or2play

    or2play 1/2 ton status

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    1. Lot of opinons on this. Either way you go, a good shift kit and larger cooler are a must. Personally I'm swaping a 700 in place of my 350.
    2. You can do one of two things, the 700 has a longer output shaft that a 350. You can get a aftermarket output shaft ($160 for ORD). It makes the back of the 700 look just like a 350. Second option, get a spacer from advance adapters to take up the space inbetween the tranny and stock 350/205 adapter.
    3. Yes, as long as the engine is a chevy block.
    4. Yes, the 700 has a .70 overdrive
    5. A locking convertor has a clutch inside the convertor that locks it up to create a mechanical connection between the engine and tranny. Helps with gas mileage because of no slippage in the convertor.
     
  3. zakk

    zakk 1/2 ton status

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    TH350's can be amde to last if they are rebuilt right and maintained well.

    700's have OD's but they are (in stock form) known to loose gears. With big tires and 4.10-4.88 gears, you still will be below 3000 rpm at freeway speeds.

    If i had a money tree, i would go with a Th400. you don't buy a K5 then upgrade to 1 ton stuff for the fuel economy of it. The 400 will outlast all of them.
     
  4. 69K5

    69K5 1/2 ton status

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    or2play

    thanks for all the answers! i will just have to keep looking before i decide.

    thanks

    nathan
     
  5. 69K5

    69K5 1/2 ton status

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    zakk

    i will keep a look out for a 400 ijust dont remember seeing any. are there any distinguishing marks?

    thanks
    nathan
     
  6. ratlover

    ratlover 1/2 ton status

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    a 400's pan looks like Illinois

    a 350's pan looks like a square with one of the corners noked off

    a 700's pan is square

    My vote is a 400 and screw the OD....or a 4l80 /forums/images/graemlins/cool.gif If you have to have OD
     
  7. 69K5

    69K5 1/2 ton status

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    i dont know if od would change anything. i dont have it now so i dont guess it matters.

    nathan
     
  8. rebelk5frk

    rebelk5frk 1/2 ton status

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    If you aren't looking for better gas mileage from overdrive (which if you want 1 ton you must not be) you can use the advantage of the overdrive to run higher ratio gears in the axles.
     
  9. zakk

    zakk 1/2 ton status

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    Here is a pic of all the different Tranny's you could ever want. Happy Hunting!

    [​IMG]
     
  10. reddog64

    reddog64 1/2 ton status

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    IMHO dont wast tiem with a 700r4...

    They break...
    too often....

    do a search on how many people have ripped them apart.. if your staying on the road maybe a trail or two it'll do with proper cooling and gears.. if you wanna wheel the pee outta it.. do like i did.. go TH400.... they, like said, will outlast the truck... there one tough tranny... even junked ones at pull a part places go for as much as 400 bones at times....
     
  11. 69K5

    69K5 1/2 ton status

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    cool thanks for the pics

    nathan
     

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