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NV4500 - Anyone running one? Which T-Case?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BorregoK5, Nov 29, 2002.

  1. BorregoK5

    BorregoK5 1/2 ton status

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    In my persuit to rebuild my K5 into a dual purpose buggy, I've begun to think away from the doubler.. and into a stick with a low first gear. I may try and mate up something tricky for a transfer case.. but I'm interested in what other people have done and especially which transfer case they are using (pros-cons). From what I understand the NV450 began production in 1992 in both Dodge and GM 3/4- and 1-ton trucks. Its a cast iron case and weighs about 200lbs. From 1992-95, the GM version of the NV4500 transmission used a 6.34:1 first gear, but after that Dodge and GM versions use a 5.61:1 first gear. All of the NV4500's use either a .73:1 or .74:1 overdrive ratio for easy freeway travel.
     
  2. u2slow

    u2slow 1/2 ton status

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    You can bolt a right-hand drop NP241C right onto the back of a 4wd NV4500. Add some 4:1 gears and a slip-yoke eliminator.... /forums/images/graemlins/thumb.gif
     
  3. Batmanjr

    Batmanjr 1/2 ton status

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    You can also bolt any 6 bolt style 205 up to it! 32 spline of course!!!! /forums/images/graemlins/thumb.gif
     
  4. Bullet

    Bullet 1/2 ton status

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    Contact Sparky87K5, he has installed a NV4500 in his Blazer, though I think he has an NP208 behind it.
     
  5. BorregoK5

    BorregoK5 1/2 ton status

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    Well this is promissing - the NP241C has a 27 and 32 spline version available but is chain drive.
     
  6. BorregoK5

    BorregoK5 1/2 ton status

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    The 205 would be the one I'd like to run (all gear - no chain) . Looks like Parts Mike sells the adapter ( GM 4WD NV4500 X GM NP205 32T Spline - $500). What I still don't know though is if that adapter is for the pre '85 np205's with the short 32 spline female adapter found on the back of th400's or the '85 and on up with the longer 32 spline female adapter found on th400 and sm465's.
     
  7. u2slow

    u2slow 1/2 ton status

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    A 85-91 NP205 will bolt on with a couple of mods.

    1. 80-84 32-spline "short" input shaft
    2. Notch the extension housing for shifter rail clearance.


    Another good low geared solution is to use a Dana 300 - 2.62:1 or 4:1 aftermarket. It will bolt right to a 4x4 NV4500 so long as it has the 23-spline Dodge output.

    There's also various other input gears for the D300, such as a 32-spline (GM) or 29-spline (Dodge diesel). There's also a beefy output shaft kit, and twin-stick kits too.
     
  8. K5BLT4FUN

    K5BLT4FUN 1/2 ton status Premium Member

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    I am presently running a 1998 GM version NV4500 in front of a 1978 GM version, figure 8 bolt pattern NP205 transfer case. I modified the 205 to the large bearing input with 32 spline female input (TH400). I purchased an Advanced Adaptor plate to mate the Dodge tail housing to the GM 205. I did have to cut approx. 1/2" off of the output shaft of the 4500, but no big deal. I have been running this set up for 1 year with no problems. I am however getting ready to remove and sell the NV4500 very soon. I like the 5spd, but I am going to a built auto setup.
     
  9. BorregoK5

    BorregoK5 1/2 ton status

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    Doing a little research and I'm coming accross a lot of NV4500/Dana300 info and upgrades (gearing, rotation, etc) . My issue though is with the 23 spline output which is good for a lightweight jeep, but I'd prefer a 32 spline due to weight with the hp/tq it will have to take. None the less, the Dana300 and the 23 spline NV4500 will prabably be easier to find.

    With the 85-91 NP205 and 80-84 32-spline "short" input shaft, what mods am I looking at ( besides the shifter clearancing)? Are these including the adpater or machining them to fit?

    Thanks for helping me narrow this down!
     
  10. BorregoK5

    BorregoK5 1/2 ton status

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    So you have a 98 GM NV4500 / Adv. Adp. NV4500 Dodge tail to GM 205 / 78 GM Np205 . Sounds a lot like what I'm after. Did the dodge tail adapter fit without modification to your GM NV4500? That year np205 has the same figure 8 bolt pattern as the 32 spline th400 version did of the same year, correct? How much spline remained after the 1/2" was cut on the NV4500? What rear end gearing and tires did you run if you don't mind, so I can compare - was 1st gear as low as you wanted? I can think of a lot of reasons to stick with an automatic, what was your reason for ditching this setup?
     
  11. K10ANDYKHAMNIC

    K10ANDYKHAMNIC 1/2 ton status

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    cmon i run a 208 , ive only busted it a couple times ! oh wait i dont have a 415 cid engine haha /forums/images/graemlins/angryfire.gif

    on a side note , David has an nv4500 he bought for his jeep that he probly wont use . dont know the specs but lemme know if you are interested.
     
  12. BorregoK5

    BorregoK5 1/2 ton status

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    If it wasn't for my stroker (and future possibilities) I probably wouldn't worry about it.. but I've systematicly broken every component between it and the ground. Now that I have 1 ton gear / driveline (still need the front) I'm guessing the np203 or my th350 (again) will be the next weakest link. Ask David about that NV4500 and see what its from / what year. I might be interested.
     
  13. K10ANDYKHAMNIC

    K10ANDYKHAMNIC 1/2 ton status

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    I thought u had a 60 in the front ? just not locked yet u mean ?
     
  14. BorregoK5

    BorregoK5 1/2 ton status

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    Stock CV shaft.. well pieces of one anyhow! And yes , its a open Dana60 ... well worth the added weight!
     
  15. OL14BLAZ

    OL14BLAZ 1/2 ton status

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    Have you thought about an Atlas T/C? I know they are pretty pricy, but they are all gear drive with avaliable 4.3 gear reduction and IMO they are stout enough for a K5 /forums/images/graemlins/thumb.gif /forums/images/graemlins/pimp1.gif

    Eric /forums/images/graemlins/usaflag.gif /forums/images/graemlins/k5.gif
     
  16. K5BLT4FUN

    K5BLT4FUN 1/2 ton status Premium Member

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    Yes, I have a 98 GM NV4500, with a Dodge Tailhousing to an Advanced Adaptor plate to a 78 GM NP205 400 style transfer case. The 205 has the 400 version 32 spline female input gear. Quite a bit of the spline is still usable, only a small amount is removed. I am running a 14B FF with 4.56 gears and 35x12.50x16 SSR's. First gears is great in Low Low. The reason I am changing is merely financial at this time. I am broke and need the money for other things.
     
  17. BorregoK5

    BorregoK5 1/2 ton status

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    Yeah, a little pricey. I don't think I'll need such a low gear reduction. I'm pretty happy with my current setup but tend to climb things a little fast so I've been looking into doublers, gear replacments and other options. My current crawl ratio is as follows:

    TH350/NP203/4.56 rear end
    1st = 23:1
    2nd = 14:1
    3rd = 9:1

    But with the 5 speed, 1st is more than doubled already, and second is still lower than the th350/np203 first gear. I keep the weight down and I'm still freeway friendly on the top end!

    NV4500/NP205/4.56
    1st = 58:1
    2nd = 31:1
    3rd = 15:1
    4th = 9:1
    5th = 6.5:1

    This setup from what I gather will handle up to around 450 hp which barely cuts it, but for the price, is an excellent option.
     
  18. 6.2Blazer

    6.2Blazer 1/2 ton status

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    Just don't forget about factoring in the gear reduction in the torque converter of the auto tranny which is around 2:1. The biggest advantage you would have with the NV4500 is the overdrive which would then let you go to a lower axle ratio.
     
  19. BorregoK5

    BorregoK5 1/2 ton status

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    Thats something I've been trying to locate numbers on with TCI in relation to my lower than stock towing converter. Higher stall converters have a 2:1 reduction but stock converters are slightly less than 2:1, which means the one I'm running is even lower. That will definately factor in.
     
  20. dyeager535

    dyeager535 1 ton status Premium Member

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    Obviously with your use, your situation is a bit different than mine, but assuming true 35" tires on your truck, an SM465 would give you a 60MPH cruising RPM of 2627.

    My dads truck turned almost exactly that RPM on the freeway with his 454 before he got his gear vendors OD unit, and it was fine.

    Those RPM's are a little higher than I'd *like*, yes, but the SM465/205 setup is SOO much easier and cheaper to do. Yes, you'd not want to go with much larger tires, (so as not to lose the benefits of the 4.56's) but the SM465 apparently has a slightly better first (low) gear than either of the 4500 versions anyway.

    As cheap as the acquisition is of the 465/205, you'd perhaps be just as well off TRYING that setup, and going NV4500 if you decided you wanted numerically higher gears and the OD. The price shouldn't go up on the NV4500 setup in the meantime anyways, rather, there should be more of them, and more parts available. You'd always be able to resell the 465/205 setup.

    Just my thoughts. /forums/images/graemlins/smile.gif
     

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