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NV4500 questions

Discussion in 'The Garage' started by Russell, Feb 13, 2006.

  1. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    Howdy guys!

    I got an interesting PM on a different forum that I frequent -- Fella tells me he has a 92 GMC 1 ton 4x4 truck with an NV4500 / NP241 t-case that he is considering selling, and wondered if I wanted it.

    If it is within my price range, I do believe I'll pick it up, but I need some advice first.

    First, seeing as it is a 4x4 tranny, I need to figure out what I want to do for t-cases. Stock, it has the driver's drop t-case, and of course, i've got a pass side drop. So my first option, which may be the easiest / cheapest would be to buy and install a Ford front diff, and get driveshafts made up for the truck.

    Second option is to replace the t-case with a 205. I've got a divorced 205 sitting in my shop, which I do believe is a 32 spline case. I hear I am able to cut down the 4x4 output shaft 1/2 and inch or so, and have an aluminum adapter made to bolt the 205 straight up to the NV4500, with it being the exact same length as my SM465/205 combo is right now, so I wouldn't need new driveshafts.

    However, there are potential roadblocks both ways. Who knows if a Ford diff bolts straight up to my Chevy or not, and how much driveshafts might cost. And apparantly there can be issues with driveshaft to external slave cylinder clearance (I've already got a hydro clutch, no worries there), plus the cost of that little adapter for the 205, and how to bolt the 205 shifter up.

    Which do you guys feel would be the best course of action? Or should I maintain my original plan of waiting till I find a 2wd NV4500, and use it with the divorced 205?
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    It wouldn't be the exact same length as your 465/205 combo. Assuming it bolts up with nothing more than a face redrill and input gear swap on the 205 (and boring the case for the larger input bearing) it'll be 1.5" longer. My NV4500 is 20.5" from where the Bell bolts up to the rear face of the T-case adaptor. My 465 is 19" from the rear face of the bell to the back of the T-case adaptor.

    You could also find a pass side drop 241 and do an SYE on it. Straight bolt up deal...

    Rene
     
  3. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    Oh, I thought all 241s were driver's drop?

    What is a SYE?
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    89,90 and 91 NP241's from K5's and suburbans are all passenger drop. A 208 also bolts up with no drama, and there are tons of those around in passenger drop. All you need for either is a 32 spline input which is an easy swap.

    Rene
     
  5. snoman87

    snoman87 Registered Member

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    Hey Russell,

    Why don't you let me buy it ... at the rate your going your never going to get you truck on the road :haha:
    If you really want you can get a passanger drop 208, the one you have might even work, and bolt it behind the NV4500 with no problem. The only issue you will have is the clutch slave, there will probably be driveshaft clearance issues. If the 241 has a mechanical speedo I might concider swapping my PD241 for the 92' DD241 t-case ... or even just buy it from you.

    I still think you should let me buy the NV4500/241 combo and look for the 2wd 4500 to use with your divorced 205.
     
  6. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    David -- You have an email :)
     
  7. snoman87

    snoman87 Registered Member

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    well I bought the whole truck :) Now just gota put the 4500/241 into my CC:)
     
  8. fordeater

    fordeater 1/2 ton status Premium Member

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    Did the P.O. swap in the nv4500 cause they didn't get put in gm vehicles until 93. I thought the nv3500 was in pre 93 gm vehicles.
     
  9. snoman87

    snoman87 Registered Member

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    It's a 93' ... one owner farm truck with 410,000 km on it. Engine is running pretty rough on cold start but what I want is good ... tranny and clutch feel nice and tight :) Going to swap the 63" rear into my CC for a nicer ride
     
    Last edited: Jul 10, 2006
  10. fordeater

    fordeater 1/2 ton status Premium Member

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    right on, the original post said 92. My 72 Chevy K20 will be getting an Nv4500 as soon as i have the funds to rebuild it.
     
  11. snoman87

    snoman87 Registered Member

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    I don't think this one need rebuilding ... at least not right away. Just trying to figure out what to do with the rest of the truck now.

    Russell has first call on all the diesel parts for a 2wd SAS and Diesel conversion. If that falls though I can put my 465 in and try to turn it for the purchase price
     
  12. Ryan B.

    Ryan B. 3/4 ton status GMOTM Winner

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    Yo!
    Its a Chevy 32 spline output?
    Does it come with the bellhousing? It probably has the slave low on the passanger side which might be a problem with the driveshaft. Advance adapters' bellhousing is like 3-400 bucks to make it like a factory sm465 bellhousing.. I'm not sure of alternatives besides that.
    What you need to score is a Round Pattern 32 spline Np205, but most of em are slipyoke so you might want to convert that to a fixed yoke 205.
    Unless you got lucky and scored an early nv4500 or something you need to notch the tailshaft housing.
    The tailshaft 5th gear housing IS the adapter, so it'll bolt up to the round pattern 205 with some notching on the tailshaft housing to clear one of the 205 shifter rails, and also clearanced a hair to clear the idler nut on the np205.
    It will be like factory, but it looks like it is about 1.5" longer than an sm465-np205.

    :whistle:
     
  13. sandawgk5

    sandawgk5 3/4 ton status

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    Or you redrill a 203 range box face to the round pattern and then bolt the 205 to the doubler and not notch anything:D . I want me a 6.0L with a NV4500 and doubler:D . All it takes is credit right:D

    Ira
     
  14. Ryan B.

    Ryan B. 3/4 ton status GMOTM Winner

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    That was the plan, but a 5 speed in my tow rig would be pretty nice too. :rolleyes:
     
  15. neverendingproject

    neverendingproject 1/2 ton status

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    Before the nv4500 they used 465's. The nv3500 is the 5 speed in half-tons.
     
  16. fordeater

    fordeater 1/2 ton status Premium Member

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    i know this, i meant for the 88 and up body style, i thought all of that body style was nv3500 until the nv4500 came out in 93


     
  17. neverendingproject

    neverendingproject 1/2 ton status

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    they still used 465's in the new body style (till 92). My 95 stepside has a nv3500, so i know its half ton stuff.
    The three in 3500 indicates a lower torque rating like 4l60e and 4l80e.
     
  18. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    One interesting bit of trivia when re-drilling a 203 for the NV4500 is that the 6 hole round pattern is 'handed'. Because all T-cases behind the NV4500 from the factory were drivers side drop the pattern for the 6 hole is mirrored. I ran into this recently and had to do some head scratching to understand why one of the bolts didn't line up with the re-drill. I ended up using a carbide burr on a dremel tool to slot the 4500 output housing instead.

    Rene
     
  19. sandawgk5

    sandawgk5 3/4 ton status

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    Is that because the 6 bolt circle pattern is not symetrical? I dont think I understand what handed is. I is a mechanic I need a picture:D

    Ira
     
  20. fordeater

    fordeater 1/2 ton status Premium Member

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    I didn't know this, thanks for the info.
     

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