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th700r question regarding front diff

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by arq, Aug 12, 2003.

  1. arq

    arq 1/2 ton status

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    Location:
    Imperial Valley/Maricopa
    i'm getting stuff ready to install my engine/trany/xcase in my 71.
    the tranny is a 700r, there are two options that i am considering (1) move the engine forward or (2) move the Xcase back and relengthen the drive lines.

    I am leaning more towards moving the engine forward, any drawbacks from doing this. I have a few questions before i do this;
    1) will my fan hit the radiator??
    1.1) will my belts hit the fan shroud??
    2) will the diff hit the oil pan(see note)??
    3_ will the blazer tend to "fall" forward while going downhill??
    4) will i loose some traction on the rear wheels, cause i'll be shifting some wait forward???
    4.1) will it fish tail(see previous)??
    5) will my frame weaken cause i bore 8 extra holes in it??

    NOTE: i'll be puting in a 2" lift.

    thanks,

    ARQ.
     
  2. Robin

    Robin 1/2 ton status

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    How far do you think you'll have to move the engine ahead?
     
  3. ntaj*ep

    ntaj*ep 1/2 ton status

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    I moved my cross members back like a max of an inch. /forums/images/graemlins/eek.gif
    Do YOU really think you would see all these problems with moving the engine up an inch? I mean ya the fan shroud will probibly need to be cut, but unloading the rear? I don't think so......
     
  4. Chris_T

    Chris_T 1/2 ton status

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    I believe the spacing to move the crossmember back is 1 3/4". That's the route I went with and had no problems. You can PM or post if you have any other Q's
     
  5. 73K5Kid

    73K5Kid 1/2 ton status

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    I have no problems from moving my engine forward an 1 3/4. My fan does not hit or my pulleys. This is the easiest way to go in my opinion. I went this route so I did not have to mess with my drivelines until I go 3/4 ton. If you have any questions pm me.
     
  6. arq

    arq 1/2 ton status

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    thanks for all the responses, i was just tring to cover all bases. my biggest uncertainty is the oil pan/axel clearance. I have not put the engine in but looks like it'll be a tight fit if i move the engine up an 1.75"
    that'll probably be my first choice since i'll also add some room to put in the HEI.

    thanks again,

    ARQ.
     

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