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Question For SM465 Guru's

Discussion in 'The Garage' started by Jimbo*, Apr 2, 2007.

  1. Jimbo*

    Jimbo* 1/2 ton status

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    I have been told, but never verified, that the later model SM465's used in the 2500/3500 (new body style) pickups had a shorter throw to the shifter. I am referring to the aluminum top which relocates the shifter to the rear of the case due to body clearance.
    Does anybody know for sure?
    Thanks, Jimbo
     
  2. tarussell

    tarussell 1/2 ton status

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    I'm no guru but I have turned a wrench or two........
    I was told that the aluminum cover is the short throw for the newer body style trucks too. Can't confirm for Ya' but I think you are correct.

    Tom
     
  3. Jimbo*

    Jimbo* 1/2 ton status

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    I was hoping you'd reply. I've never had the chance to compare them side by side in running trucks, so I don't know for sure either.
    Thanks, Jimbo
     
  4. MuddinManny

    MuddinManny Banned

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    Next questions is are they interchangeable with the older SM465's that came with 81-87 Rigs K10-K30's? I'd like to know. Short throw in MUD would be awesome!

    Manny
     
  5. jtrux

    jtrux 1/2 ton status

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    I know that on 465's like mine (1971) they have a 10 spline mainshaft and on the later models that number changes so I would think that if you changed out your clutch you should be good.
     
  6. MuddinManny

    MuddinManny Banned

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    I know this sounds stupid so don't laugh too hard. A clutch has to match the spline count too? I didn't know that. Hmmm. Now I wonder if I have a 10 or a 32 spline. That would make swappin' out a NP205 so much easier with a 32 spline!

    Manny
     
  7. Jimbo*

    Jimbo* 1/2 ton status

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    Manny, the case is identical between the two. The only difference is the top cover; The aluminum top has the shifter tower located rearward 3 5/8 inches from the cast iron top cover which has the shifter tower centered.
    I agree, a shorter throw on a 465 would be awesome in any condition!
    Jimbo
     
    Last edited: Apr 3, 2007
  8. MuddinManny

    MuddinManny Banned

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    Can I switch them? I'd love a short throw 465! Puh-weese tell me I can!

    Manny

    BTW...CRAP! I just checked. My Centerforce DF is a 10 spline...CRAP, CRAP, CRAP! :mad:
     
  9. Jimbo*

    Jimbo* 1/2 ton status

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    Whoa there! Clutch spline refers strictly to the input shaft. These tranny's all have 10 spline 1 1/8" diameter input shaft's.
    The rear output shaft can be either 10 or 32 spline in a 4x4 model.
    As to your question of what output spline you have, is your adapter a figure eight pattern on the transfer case end, or is it round. If it is round, you will also have the "short" adapter, and a crossmember with one or two "humps" in it.
    Hope this helps.
    Jimbo
     
  10. Jimbo*

    Jimbo* 1/2 ton status

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    Take your time and read it again Manny; We are talking about ONLY the top cover, not anything to do or change with the internals of your tranny.
    So yes, your centerforce clutch stays. Hell, might be able to change top covers in the truck.
    Jimbo
     
  11. MuddinManny

    MuddinManny Banned

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    So let me see if I have this correct.

    1) I can swap shifters for the short throw. If yes, what model years do I look for and what all do I need to snag?

    2) Round=Short=Humps=10 Spline. What ='s 32 spline?

    Sorry, I'm a lil slow tonight

    Manny
     
  12. Jimbo*

    Jimbo* 1/2 ton status

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    Ok, let's go through this slower.
    1) It's more than just shifters, it's the entire top cover of the tranny. I have an extra. We are not sure the throw is actually shorter, yet.
    2)Round=hump(s)=short=32 spline.
    Figure eight or "racetrack" =flat crossmember=tall adapter=10 spline

    Jimbo
     
  13. MuddinManny

    MuddinManny Banned

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    Gotcha! Thanks. So sorry. I'll look and take pics tomorrow. Hopefully I can tell, but that's why I'm gonna take pics (If I'm physically up to it).

    Manny
     
  14. tarussell

    tarussell 1/2 ton status

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    Might keep in mind that the shifter cover we are talking about was intended to be used in the new body style truck hence the new location of the shifter tower. This may not work well with the square body style bench seat trucks. When the tranny is in reverse it is mighty close to the seat and it might not clear with the new location . Just something to think about.

    Tom
     
  15. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    True enough, but that style is also meant to have a straight shifter rather than the double bend style the square body versions got. My NV4500 shifter (same 5" rearward location) with the straight shifter doesn't drop any further rearward when in reverse than the old 465 I had did. Of course the NV4500 does have a shorter crisper throw...no knuckles into the dash in third either. :D

    Rene
     
  16. tarussell

    tarussell 1/2 ton status

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    Good point ! I didn't think about the stick not being bent the same .
    If this works out somebody post up with the results - we might all need the latest shifter cover.

    Tom
     
  17. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    How hard are the late model aluminum covers to find? I recall the SM465 being an optional tranny when i bought my '88 round body brand new...but didn't really pay attention to how many years it was available. I'd have to assume at least until early/mid '92 when the NV4500 debuted.

    Sounds like they might be kinda hard to find. I know I've never seen one in person.

    Rene
     
  18. tarussell

    tarussell 1/2 ton status

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    1991 is the last year that I know of that they offered the 465 in the new body style trucks . I think they did phase out when the 4500 came in 92.
    So that means they were only offered for four years ......rare indeed !
    One more item to keep an eye out for when boneyard hunting.

    Tom
     
  19. RingMaster4x4

    RingMaster4x4 1/2 ton status Premium Member

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    I have a aluminum cover in my shop but no shifter. I did put in to my SM465 and it fit I just can't find a shifter for it. The iron top shifter would not reach the shift forks
     
    Last edited: Apr 3, 2007
  20. atho

    atho 1/2 ton status

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    If you have a 465/208 like your sig says, then you have a 32 spline 465.

    The 10 spline he's referring to is a 465/221 and 465/205 thing only. It has the crappy little splined sleeve between the male output of the trans and male input of the xfer that likes to strip out.

    The 465/208 and 465/241 definitely all have 32 spline connections with no sleeve. So do newer (84 or 85 and up K30) 465/205's, but they are rare because they only came under K30's.
     

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