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HELP ME!!! SM465

Discussion in 'The Garage' started by BigOrange90Jimmy, Jul 9, 2002.

  1. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

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    Hey fellas,

    I need some info on the SM465. I don't mean like specs and stuff like that, but if it will bolt up to an NP241 or NP208. I'm thinking about putting it in my '90 Jimmy. Will I be able to use my electronic speedo or will I have to rob the speedometer off the donor truck? Also, there should be a mounting spot for the clutch in the dash of my truck, right? Currently I'm running the TH-700, but I'm ready for that 6.something:1 first gear ratio and I've always wanted a manual in any vehicle I own. Plus, that would give me a really good reason to use that Idle Speed Controller from Off Road Engineering. Any help would be appreciated.

    Ash
     
  2. LA Bogger

    LA Bogger 1/2 ton status

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    If you look in the August 4 wheel and off road mag there is a good article on 465. But I don't know if it will bolt up to a 241 but I know it will bolt up to a 208. Hope this helps..


    Eat More Mud!!!
     
  3. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Since your truck is a '90 model, you would need to find an '82 or '83 and newer 465 tranny.

    These newer tranny's are a 32 spline and have a longer output shaft. They will work just fine with the 241 if you can find the adaptor to mate them.

    The 241 and 208 are the same t-case, just the 241 is electric.

    I don't see why it wouldn't work if you could find the adaptor.
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    32 spline 465 is 81 and up. The T-case adaptor should work with a 241 as well. You'll need a 32 spline input gear for your 241 if you have the 700R-4 now.

    To run a hydraulic clutch you'll also need all the pedals, clutch master, lines and slave cylinder plus a bellhousing. All this can be found on any 85 and newer 4 speed truck. Your K5 should have the dimple in the firewall for the holes needed to mount everything as well.

    posted by Wes: The 241 and 208 are the same t-case, just the 241 is electric.

    Not really dude. The 241 is an entirely different T-case. In fact the first year or two it used a mechanical speedo too. The low range is 2.72:1 compared to the 208's 2.61:1. Some people consider the 241's oiling system to be superior to the 208 as well. They are very much not the same T-case though. The 241 does mount up with the same 6 bolt round pattern though.

    Rene
     
  5. 70~K5

    70~K5 1/2 ton status

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    I wonder if the new Jeep Rubicon's 4.0x1 low range would work in a chevy 241TC's case?
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Not too sure, I don't see why it couldn't be done though. The planetary in the 231 is similar but lighter duty (3 pinion versus 6 in the 241) IIRC the 4:1 aftermarket upgrades the planetary to 6 pinion as well... Another item currently available for the 241 is the SYE which is cool too. No SYE kit's for the 208 unfortunately, although it can and has been done by K-10 Andy /forums/images/icons/cool.gif

    Rene
     
  7. 70~K5

    70~K5 1/2 ton status

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    One of the mags said the rubicon will have a 241 TC in it.
     
  8. fortcollinsram

    fortcollinsram 1/2 ton status

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    Yeah, if you can find a 241 adapter for the 465, it'll bolt right up...I just did this swap (except I ditched my entire 700/208 combo for a 465/205)There are dimples in the firewall to show you where to drill for the MC mounting and the resivour...I picked up my bellhousing from an 85 K5 with a 6.2L...I thought the most difficult part about thte swap was removing and replacing the pedal assembly...you have to removethe steering column and crap like that...You will also need a flywheel, clutch, Master and slave cylinders if you are going hydraulic, pedal assembly, and of course the 465...PM me if you have any specific ?'s relating to the swap...

    Chris
     
  9. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    The NP208 adaptor for the SM 465 should bolt right up to the 241. As long as the 241 has been converted to 32 spline input you should be good to go.

    Rene
     
  10. thatK30guy

    thatK30guy 1 ton status Premium Member

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    What I actually meant was the 208 and 241 will interchange from the other by using the same adaptor. Just that the 241 was electric. That's why I say they are pretty much the same t-case. /forums/images/icons/wink.gif

    BTW, I had an '81 K10 with a 465/208 combo and they had 10 splines and I read somewhere in a magazine that the 32 spline 465's were started in either '82 or '83. /forums/images/icons/wink.gif I know the '81 had 10 spline because mine had it. /forums/images/icons/wink.gif
     
  11. BLUESMAN

    BLUESMAN 1/2 ton status

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    So any NP241 case will bolt up to an 208 adapter? I have an SM465/208 and wanting to go to the 241 and install 4:1 lo range gears in it(from the NP231 kit).That would give me 107:1 crawl ratio with my present 4.10 diff gears.
     
  12. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Make the confirmation....go do it and tell us what you find. /forums/images/icons/wink.gif
     
  13. BLUESMAN

    BLUESMAN 1/2 ton status

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    GEE thanks....I'll be the giena K/5!!!Why not I've done everything else.It won't be until after I get my 37" MT/R's and my cage welded up!!Oh crap need them rock-sliders too(TOO LATE for the driver's side!!!).My truck is so cut up my wife refuses to sit in it, let alone drive it!!!That's just the way I like it!!!Mike
     
  14. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

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    Ok,

    Wow, you guys are awesome. That's a lot of feedback overnight. A helluva lot better than some people in North Carolina have done in a years time. You've answered the majority of my questions. I still need to know what to do about the speedometer. Also, is there anyone who has done a similar swap on an 87-up K5? As to the choice of T-cases, I can get any NP case ever put in a Chevy product around here. I just need to know which one's will work. I can get a 203, 205, and I've got the 208 and the 241. I've always wanted a twin-stick in the floor as well, so if you can, help me with that as well.

    Ash
     
  15. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

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    One more question. I've located an SM420. Do I want it or the 465? Also, what will bolt up to it and how hard would it be to do?
     
  16. fortcollinsram

    fortcollinsram 1/2 ton status

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    The only real advantages the 420 has over a 465 is a lower granny gear (7.2 or so in the 420 versus 6.55 in the 465) and it is a bit shorter...I am unsure how the 420 stacks up against the 465 in terms of brute strengh...AFAIK, the 420 and the 465 share the same bolt pattern on the bellhousing but I could be mistaken...It will probably be easier to get parts (at least ones that are in decent shape)for a 465 than a 420...

    I would put the 465 in and ditch the chain driven t-case in favor of a 205 (heck, thats exactly what I did on my 87 K5... /forums/images/icons/grin.gif ) Sure the 205's ratio isn't as low as a 241 or a 208 but personally, I am willing to give that up in favor of peace of mind that my t-case won't blow chunks when I lay into the skinny pedal a bit...You can always get an ORD doubler to take care of the 205's not-so-great low range /forums/images/icons/wink.gif

    Good luck

    Chris
     
  17. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

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    And just one more question. A guy down here is selling a running Duece and a half for 350 bucks. It runs and it's a 6x6. He's just moving his shop and doesn't want to have to tow it to his new one. Should I convince my dad to buy it for me so I can use the axles, convince him to buy cuz it's a 2 1/2 ton truck and it runs, or just forget it. Don't forget to help me out with the tranny questions, though.

    The madness will never end here.
     
  18. m j

    m j 1/2 ton status

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    leave the 420s to the Heep guys
     
  19. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

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    That's good enough for me.
     
  20. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

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    No one has any input on the Rockwell axles or the SM420? Anything useful would be great!
     

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