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TH400 to 4-speed Driveshaft

Discussion in 'Got gears?' started by ts-gs, Sep 30, 2005.

  1. ts-gs

    ts-gs 68 GS400 Convertible

    I am working on a conversion from TH400 to Muncie 4-speed. Will I have to change the length of the drive shaft?
     
    ts-gs, Sep 30, 2005
    #1
  2. Three504spd

    Three504spd Well-Known Member

    yes, the th400 has a longer tailshaft the the 4 speeds,if you had a th350 it would be a direct match-up, so easiest thing would be to find a th350 car and get the driveshaft out of that.
     
    Three504spd, Sep 30, 2005
    #2
  3. ts-gs

    ts-gs 68 GS400 Convertible

    Didn't anticipate that. Amazing how the budget just grows and grows. Can the shaft be cut down?
     
    ts-gs, Sep 30, 2005
    #3
  4. allioop108

    allioop108 Well-Known Member

    Don't quote me on this but I would hold off on modifying the driveshaft until you have your 4 speed tranny in place. The reason I'm saying this is because I recently did a conversion on my '70 cutlass. Car originally had a 350 engine and 350 tranny. I dropped in a 455 engine and super t10 transmission which looked to be the same dimension as the muncie m21 that I was originally going to use (I did not do actually measure them with a ruler). I figured that my original driveshaft would fit and it turned out to be too long. I measured how much I needed to cut off and had it shortened. When all was done my driveshaft ended up being the same length as the one in my '70 skylark with a 455 engine and 400 tranny. I know when I bought the 4 speed setup the guy gave me the driveshaft (350 motor m21 tranny) that supposedly was in the car and that also was too long.

    Allen
     
    allioop108, Oct 4, 2005
    #4
  5. Duane

    Duane Member

    The front yokes are also different diameters for TH 400 vs TH 350/4-speeds.
    Duane
     
    Duane, Oct 4, 2005
    #5
  6. ts-gs

    ts-gs 68 GS400 Convertible

    Thanks for the info. I guess the rule applies, measure twice, cut once. Makes sense to wait and measure.

    As for the yoke, I figured that to be different. Aside from the diameter, I think it has a different spline count.
     
    ts-gs, Oct 5, 2005
    #6
  7. daward

    daward Measure twice, cut once.

    I have a brand new driveshaft for a TH350 car WITH a yolk and ujoints (I believe it a 28 spline)...

    Dimensions as follows:

    [​IMG]

    This was ordered thru YearOne for my 66 Special, which is now long gone. Make me an offer if interested. I can get you pictures, and I'm pretty sure those measurements are correct (they were from a few months ago).

    I paid over $300 for it new :Dou:

    PM me with an offer if interested (or trade for 455 parts)
     
    daward, Oct 7, 2005
    #7
  8. oPh

    oPh Well-Known Member

    Factory driveshaft will have to be longer if installing '63-70 Muncie (small output) 4spd in place of Turbo 400.

    Using a large output Muncie used in select '70 Chevy products & in all '71-74 GM A-bodys & F-bodys, you should be able to get away with same length driveshaft.
    :3gears:
    Roger
     
    oPh, Oct 10, 2005
    #8
  9. ts-gs

    ts-gs 68 GS400 Convertible

    So who's right? Some here are saying it needs to be shorter, others longer!
     
    ts-gs, Oct 10, 2005
    #9

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