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NV 241 Swap

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by kpanza, Jan 31, 2001.

  1. kpanza

    kpanza 1/2 ton status

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    Has anyone out there swapped in an NV241 into a pre-90s Blazer? I have the 208 now, want to swap it out for the 241, put a slip yoke eliminator kit on it. I am also thinking about putting in the Mepco 4:1 low gears in it, but that is a maybe. What I am wondering about is if there were any NV 241s made that came with mechanical speedos? Or are they all electronic? I have a 1987 K5, so hopefully I can find one with a mechanical speedo...if not, how hard is it to swap in the electronic dash equipment, and what all would I need to complete it?

    Thanks,

    Keith
     
  2. 90K5

    90K5 1/2 ton status

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    The first year thta GM put NP241s in trucks was '89 i think. In '90 they went to an electronic speedo, so you need to find an '89 'case.

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  3. Kennedy

    Kennedy Registered Member

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    I agree with 90K5,

    I had 1989 Blazer with the NP241 and it had a mechanicle speedo output. If you can only find a 90-91 case I wouldn't worry as you will be replacing the output shaft on the NP241 anyway when you go to the slip yoke eliminator kit. I would also be willing to bet that you could convert an electric speedo equiped 241 to a mechanical speed set up with a few parts that should be avaiable- either through GM, or from JB Conversions.

    David

    David 1989K5
     
  4. thebigdaddyof2

    thebigdaddyof2 1/2 ton status

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    Does anyone know if the 241 is a direct bolt in for the 208?
     
  5. 90K5

    90K5 1/2 ton status

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    I think it should bolt up, might want to check on the crossmember though, I can do measurements on mine if you need them, and finding someone with a 208 shouldn't be a problem

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  6. ken

    ken 1/2 ton status

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    The 241 is a direct bolt in to replace the 208. The only thing you have to watch is the spline count, as all TH700r4 equipped 208s and 241s have 27 splines, whereas the TH400 version 208s and 241s have 32 splines. On the SYE kit, I don't believe it replaces the section where the electric speedo is, so getting a SYE kit would not solve your speedo problems.

    ken
     
  7. kpanza

    kpanza 1/2 ton status

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    Well, sounds like I have to find an '89 241 case if I want to do this? That sounds like the only year that came with the mechanical speedo setup? Hmmm, I'll have to see about this. Am thinking about just leaving mine alone and saving up the cash for the Doubler setup. The thing I don't like about the 241 and the 4:1 kit is that I lose that "middle ground" low gearing...where you need the extra power of Low, but you still need speed (like the snow last weekend!), cause 4:1 is too damn low for actual driving, but awesome for rock climbing. So, I guess it's either a 241 with slip yoke eliminator kit and cv shaft and leave the 2.72:1 ratio alone, or save up for the Doubler kit some day...I think if I keep lubing my driveshaft ujoints they should survive the angle problems I have right now...
     

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