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Manual tranny availability

Discussion in 'The Garage' started by Thumper, May 2, 2003.

  1. Thumper

    Thumper 1/2 ton status

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    Hey,
    Just wondering. I have heard many guys talk about the Muncie Rockcrusher M22 tranny, and the other M20 and M21s. Were any of these offered in trucks of any sort? Or just the Muncie SM420 and 465s? Just curious... a friend was looking at buying a std with a t-case and the guy told him it is a Muncie rockcrusher. But i dont think it is. (we havent seen it yet).
    Thanks
    Mike'
     
  2. Don

    Don 1/2 ton status

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    M 20's and M 22's were only available in car's. You were correct, only 420's and 465's in truck's. /forums/images/graemlins/grin.gif
     
  3. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I've heard a lot of moron's call the 465 a "Rockcrusher".../forums/images/graemlins/rolleyes.gif

    Rene
     
  4. zakk

    zakk 1/2 ton status

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    rock crawler maybe...
     
  5. Thumper

    Thumper 1/2 ton status

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    Well, we went to see it. Its not a GM tranny I think. It has these shift rods along the outside drivers side from the shifter at the back of the trans. Beats me what it is, but cant buy it.
    Thanks
    Mike
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    There was a different 4 speed offered in our trucks, but I'm unsure if it was ever offered in 4wd. It was the MM7, a side loader 4 speed...no granny gear and 4th was overdrive. Not a strong tranny but good for fuel mileage I guess. I've only ever seen one...

    What kind of T-case was it mated to?

    Rene
     
  7. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    Yep, they came in 4WD, or if they didn't someone swapped a pretty nondesirable trany into one. I have seen exactly one-it was in a SWB 1/2 ton mid 80's P/U I considered buying when I was looking for a Blazer.
     
  8. 79Jimmy

    79Jimmy 1/2 ton status

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    The RPO is actually MY6. MM7 is a "marketing agreement" I saw one a couple of months ago and the rumor is it was available in a 4x4 though I've never seen it, just 2x4.

    James
     
  9. DieselDan

    DieselDan 1/2 ton status

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    Does it have any strength or was it another "light duty" tranny that never should have been fitted to a half ton? /forums/images/graemlins/ignore.gif
     
  10. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    It's not a very strong tranny from what I've heard. Mostly suited to 2WD with fuel mileage being the main concern...

    No first hand experience on my part though./forums/images/graemlins/crazy.gif

    Rene
     
  11. m j

    m j 1/2 ton status

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    a real fast indicator of manual tranny strength is the distance between mainshaft and countershaft, larger indicating bigger gears.
    overdrive is always weaker then a direct drive.
    OD has more parasitic loss and generates more friction/heat
     

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