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208 to 241-Search gave me a headache

Discussion in 'The Garage' started by MarcS, Feb 10, 2006.

  1. MarcS

    MarcS 1/2 ton status

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    Can somebody help me out please ??

    I have a 700r4 w/ a 208 xfer case. While its out of the truck(87 K5), I'm thinking about getting a 241 case instead.

    Basically, what is involved ?
    Are the cables/shifters different ?
    Input and outout splines ?
    Mech speedo ?


    Can you guys help, or at least help me with a better search for threads ?

    Thanks,
    Marc
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Shifter and pattern = same
    Mounting and adapters = same

    Speedo cable = Same in 1989 for sure , afterwards they were electric speedos as far as I know . So get a 1989 case . Someone can post up if 1990 was speedo or not .

    Input splines = same , I.E 27 spline for th700r4 , 32 spline for th400 sm465
    Outputs = same . 32 spline rear for slip yoke , flange driveshaft front .
     
  3. MarcS

    MarcS 1/2 ton status

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    Cool, Thanks alot Paul.
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    1990-91 electric speedo. Easy fix, convert to the (better) electric speedo at the same time. :)
     
  5. Rebel88

    Rebel88 1/2 ton status

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    i put an 89 241 in my 88 and it had electric speedo...just see if you can find a mechanical speedo "bell" from another 241 and they swap right over
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    Donor vehicle must have been mismarked or something, everything up until 1990 was mechanical.

    Right off the tech specs page:

    "Notes:
    A new electronic speedometer was also introduced for 1990, along with non-asbestos brake linings."

    Not trying to be an ass about it or anything, but when it comes to the electric speedo conversion, there is needless confusion as to when it came out.
     
  7. neverendingproject

    neverendingproject 1/2 ton status

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    what about drivshaft lengths???
     
  8. MarcS

    MarcS 1/2 ton status

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    That I'm not sure. I was going to a slip yoke eliminator when I get it.
     
  9. btolenti

    btolenti 1/2 ton status

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    the front driveshaft will be exactly the same length, unless you decide to clock the case up.

    The rear will definitely be longer with an SYE....
     
  10. randy88k5

    randy88k5 1/2 ton status

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    If your going the slip yoke eliminator route, you can use any case. Just buy the output snout of your choice. You just cant go super short SYE. You will need a mech speedo sleeve though, the one that the driven gear rides in. The 208 and 241 sleeve I believe are the same. Junk yards have plenty of them.
     
  11. btolenti

    btolenti 1/2 ton status

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    it may be easier to go with a electric speedo 241 and a electric speedo from the 90-91 models. I know I had a heck of a time finding a mechanical speedo 241, let alone just the rear output to convert a electric to mechanical.

    I also swapped to TBI after, so an electric speedo would have been the better route for me too...oh well.
     
  12. MarcS

    MarcS 1/2 ton status

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    Great info guys.

    I wanted the lower gear in 4 low. That's why I want to find a 241 over the 208. I'm not to worried about the speedo. I think it was JB Conversions, have a elec to mech, but it's expensive.

    Another question. If I do clock it up, I'm guessing I will need a new crossmember ??? Right ???
     
  13. btolenti

    btolenti 1/2 ton status

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    no the stock one is okay, but most will make a custom one so that they get even more ground clearance. THe stock crossmember has that notched area for the front output yoke. Since you are moving that up some, you can probably just mod the one you have to work....but it might just be quicker and easier to make a whole new one. Not 100% sure about this, but you may have to do some pounding on the floor and tranny tunnel to make some room for the case, since it will be moving up some. I have heard a 1" body lift can help.
     
  14. Rebel88

    Rebel88 1/2 ton status

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    only problem is i wouldnt go with a 208 since most of the sye kits for the 208s ive seen were homebrew. i have the jb conversions sye on my 241 and i think its the shiznit.

    dorian, as for the misprint of the vehicle it could have just been a change during the production year in 89...who knows?
     
  15. MarcS

    MarcS 1/2 ton status

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    Thanks guys. Now I have to find a 241.:waytogo:
     
  16. dyeager535

    dyeager535 1 ton status Premium Member

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    You aren't worried about the speedo, but assuming your '87 is the TBI in your profile, IT will. Not running a speedo makes a DRAC conversion even more sensible.

    Still can't buy the '89 getting '90 parts, the trucks are way too different in every regard for that to be even likely. Sorry. :)

    Show me GM literature (service manual, wiring diagram, update) that shows anything other than mechanical in 1989, and I'll stand corrected. Until your post, it's been universally accepted that 1990 was first year electric speedo. Not trying to pee in cheerios here. :)
     
  17. MarcS

    MarcS 1/2 ton status

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    Yes I have a 350 w/TBI. What is DRAC conversion ???
     
  18. dyeager535

    dyeager535 1 ton status Premium Member

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    DRAC conversion means going with the electric speedometer 241.
     
  19. MarcS

    MarcS 1/2 ton status

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    Thanks
     

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