Need some input on a nv4500 swap

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Smkozma69
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Joined: Thu Feb 07, 2019 1:11 pm

Need some input on a nv4500 swap

Post by Smkozma69 » Sun Apr 25, 2021 2:32 pm

Hello, I was wondering if anyone can point me in a direction to go with my jeep I have purchased an NV 4500 with a 23 output spline out of a Dodge ram my transfer case is a 31 spline it will not fit what transfer case should I be looking for to get this accomplished. My Jeep is a 1980 j20. I also noticed upon putting the transmission side-by-side the NV 4500 appears to be about 6 inches shorter than the T 18 what have any of the other Jeep swaps done to make this set up work? Any information would be greatly appreciated I’m hoping to drive my truck again this year thank you.
1980 J20 with Modified 360-60over, comp cam, roller rockers, roller chain, HEI distributor-T18, 4inch lift 37” copper stt pro’s on 20” ballistic wheels

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Stuka
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Re: Need some input on a nv4500 swap

Post by Stuka » Sun Apr 25, 2021 5:46 pm

The T18 has a spacer on the front so that the shifter doesn't end up under the dash. The 80+ T18/NP208 is actually a very rare setup. And that version of the NP208 won't work behind many other transmissions. Its best to keep that T18/NP208 setup together. If you are going to sell them to another FSJ owner, they would need them together as the trans isn't of much use without the t-case.

However, finding a 23 spline input driver drop NP t-case should not be hard. Although as I recall there was two versions of the 23 spline input.

As for the swap itself, plenty of people has swapped in NV4500s. You will need to bend the shifter to clear the dash. But another question is, which NV4500 do you have? The gas V8 version or the V10/Diesel version? If you have the diesel version, I think you need to swap out the input shaft to work behind a gas V8. And you will need a bell housing adapter, and a bellhousing.

The T150 bell housing is what you will need, and then an adapter like this: https://www.northwestfab.com/AMC-V8-Eng ... _3784.html

Most adapters are for GM versions of the NV4500, the one linked above is specific for a dodge V8 version.
2017 JKU Rubicon Lifted and stuff
Pevious Jeeps: 1981 J10, 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ


Topic author
Smkozma69
Posts: 15
Joined: Thu Feb 07, 2019 1:11 pm

Re: Need some input on a nv4500 swap

Post by Smkozma69 » Sun Apr 25, 2021 6:51 pm

I did get the gas v8 version. Actually the shifter looks as though it will be in relatively the same spot as the 18. I am keeping the t18 bell housing and have the spacer from AA. I just need to know what guys have done for the driveshafts. I’m assuming they had new ones made.
1980 J20 with Modified 360-60over, comp cam, roller rockers, roller chain, HEI distributor-T18, 4inch lift 37” copper stt pro’s on 20” ballistic wheels

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Stuka
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Re: Need some input on a nv4500 swap

Post by Stuka » Sun Apr 25, 2021 7:39 pm

Smkozma69 wrote:
Sun Apr 25, 2021 6:51 pm
I did get the gas v8 version. Actually the shifter looks as though it will be in relatively the same spot as the 18. I am keeping the t18 bell housing and have the spacer from AA. I just need to know what guys have done for the driveshafts. I’m assuming they had new ones made.
You will need to shorten the front shaft, and lengthen the rear shaft. But you won't know exact measurements until its all installed and you can measure from yoke to yoke.
2017 JKU Rubicon Lifted and stuff
Pevious Jeeps: 1981 J10, 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ

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