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Swap from TH-350 to SM465?

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

  1. Ditchdigger

    Ditchdigger Registered Member

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    Hey there,
    I'm swappin a 454ci in my truck, that I'm rebuilding.
    and the TH-350 is shot, which took the place of the original 700R4, but I'm debating on goin to a 4-speed manual like the SM-465, and my rear end gearing is 3.73 (I think)same gearing as original 700R4.
    I spose you don't really get an overdrive unless you have oversize tires or different gearing, and not sure how it would be with 3.73 that goes with the 700R4 .
    What do you guys think!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
     
  2. fortcollinsram

    fortcollinsram 1/2 ton status

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    I have 3.73s and went from a 700r4 to a 465 and love it...But I have 35's too...I plan on gearing it down to at lest 4.10 or maybe 4.56..

    Chris
     
  3. YtseJam

    YtseJam 1/2 ton status

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    I would stick with the auto if it's a daily driver.
     
  4. Ditchdigger

    Ditchdigger Registered Member

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    Nope, no way its a daily driver, just once and awhile and to pull stuff.

    Hey,fortcollinsram
    How does she act with those 35s like as RPMs go?
    I will probably never go more than 33s and no less than
    stock size. If your planning on steppin to 4.10 that must mean your gettin some low RPM in 4th almost like an overdrive or TO MUCH?
    and how do you like the granny low?

    And how did your swap go? any info that may be useful!
     
  5. Ditchdigger

    Ditchdigger Registered Member

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    Anyone else know how this would go?
     
  6. Poohbair

    Poohbair 1/2 ton status

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    I did this swap w. the help of a few friends. Not too hard, mostly bolt on, but lots of work.
     
  7. dyeager535

    dyeager535 1 ton status Premium Member

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    Dad's running a 454/465/4.10 combo with approx. 33" tires, and it runs at high RPM's on the freeway. Horrible mileage, but the engine doesn't seem to care. /forums/images/graemlins/smile.gif

    Personally, 3.73's and 33's would still keep the engine running higher than I like at 60MPH, but it's entirely manageable. Besides, I'd bet that GM made 454/465 (or 350 or 400 for that matter) combo's that were 4.10 geared, and if so, I wouldn't sweat it.
     
  8. R72K5

    R72K5 Banned

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    driveshaf tis onna be the biggest issue, make sure you have access to a donor truck with 465 setup all intact, the clutch pedal linkage idler parts and bracket and hardware is what youre gonna need to find intact or altogether soemhow.

    nothing wrong with 465 as a daily river it all depends on if you like the feel of a real truck and like to push the pedal, four speed truck toploader trannies rock, are my preference and i miss it,.

    yes lot sof 4.10 rear trucks were made with 465 and 305 and 250 and 292 and 350 and 454, 4.56 and 3.73 also. 3/4 and 1 ton only of course, taller tires help lower cruise RPM's


    goog luck
     
  9. dyeager535

    dyeager535 1 ton status Premium Member

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    Isn't 7:57 a bit early to be drinking?
    [ QUOTE ]
    driveshaf tis onna be the biggest issue, make sure you have access to a donor truck with 465 setup all intact, the clutch pedal linkage idler parts and bracket and hardware is what youre gonna need to find intact or altogether soemhow.

    [/ QUOTE ]
    [ QUOTE ]
    yes lot sof 4.10 rear trucks were made with 465 and 305 and 250 and 292 and 350 and 454, 4.56 and 3.73 also. 3/4 and 1 ton only of course,

    [/ QUOTE ]

    lol, just kidding, couldn't resist /forums/images/graemlins/smile.gif
     

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