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Couple questions, tranny swap.

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by TXsizeK5, Jul 10, 2002.

  1. TXsizeK5

    TXsizeK5 1/2 ton status

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    If i wanted to switch to a 700r4 or Nv4500 for the overdrive would it bolt directly on? What other steps are involved. Woudl i need adapters and such to mate to my 208? ALso how much does a rebuild usually run for Tcases like the 208? Im thinking of investing lots of money into my truck and making it really nice, such as new engine, tranny, axles, tires, body work, etc. And was planing to do some/most of the work with friends or with the mechanic. So i had a few questions and will probably be postin' more questions every now and then about this stuff, (just so i so i can make sur eof answers and dont look stupid with them) /forums/images/icons/grin.gif Thanks!
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Your 4 speed is already 32 spline so obviously your 208 is as well. I'd go with the NV4500, the 208 should bolt right up to it with no trouble at all. The stuff you will need is a new bellhousing and probably some driveshaft shortening/lengthening.

    Rene
     
  3. wrathORC

    wrathORC 1/2 ton status

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    more NV4500 bologna

    Dragging this one back to the top after experiencing a NV4500. After experiencing a SM465 I decided a manual 4x4 wasn't for me. I've shifted tractors from the forties faster than a 465. Shifting the NV4500 was like shifting a stock T5 or T56 which is more my style.


    I've got a NP208 hooked to a 700R4. That means I've got the 32 spline issue already addressed.

    Next is length. A 700R4 is right around 23.5" long if my memory serves me right. About 17" of that is the actual transmission if you were to eliminate the integrated bellhousing.

    The NV4500 is 18.75" long. How long is the bellhousing?

    I want to keep my 208 planted as close to where it is as possible. Moving it around adds some serious cost to a swap that would already cost buckets due to the fact that a NV4500 isn't cheap. I've passed on inexpensive 4500s ($200-$400) before due to the fact that I figured they'd be like a 465.
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: more NV4500 bologna

    To see if it's even going to be close to where you want it I'd use the 465 bell dimension to get an overall length. The NV4500 bell should be very close. The 465 bell is 6.5".

    You do not have the spline issue taken care of though. The 700R-4 is 27 spline not 32. You'll have to swap a 32 spline input gear into the 208 planetary or swap in a 32 spline 208 if you don't want to modify your existing T-case. Donors would be from either a 465/208 truck or a TH400/208 truck.

    Rene
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

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    Re: more NV4500 bologna

    Are you *sure* about the NV4500 vs 465? IIRC, (and I have no references readily avaialable), I thought gear spacing was almost exactly the same, unless of course the NV4500 you tried didn't have the really low 1st gear.

    Either way, 2,3, and 4 on the 465 and 4500 are pretty close aren't they? Nothing wrong with OD and insane gear ratios with huge tires, but if the gear spacing is the same, OD is the *only* benefit if your gear ratio is numerically very high.
     
  6. wrathORC

    wrathORC 1/2 ton status

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    Re: more NV4500 bologna

    NV4500:
    5.61
    3.04
    1.67
    1.00
    0.74

    SM465
    6.56
    3.58
    1.70
    1.00


    They're both pretty much 3 speed transmissions for the average person. In other words, on the street chances are all you're going to use is 2-3-4 on both of them and they're pretty close like you said.

    It isn't the gear ratios that interested me anyway. It was the fact that the NV4500 would shift fast and under power. It was almost as good as a T56 and probably about as good as a T5.
     
  7. wrathORC

    wrathORC 1/2 ton status

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    Re: more NV4500 bologna

    Everywhere disappointment.

    It seems the NV4500 bellhousing is in the 6.3" neighborhood. Hook it to a 12.4" NV4500 and we've got a really short setup. If it wasn't for the disappointing news that my leaky old NP208 won't work I'd contemplate moving a crossmember and getting new driveshafts.

    Unless I can find a transfercase-NV4500-bellhousing complete I guess this dream has been shot in the rear. I've seen such things come off Dodge trucks for $900-$1300 but that's a third what I've got invested in my truck and out of my price range. Plus, I haven't seen one in over a year.

    Thanks
     

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