NV4500 in a stovebolt is a fairly simple swap.
1.) Find a 1994-1997 Dodge 2wd NV4500, the lighter gas version is preferable, but the heavy duty diesel and V10 transmission will also work.
2.) Get an Advance Adapter plate to go between the bellhousing and transmission.
3.)Bolt adapter plate to bellhousing and transmission to adapter plate.
4.) Fabricate tailshaft support for transmission and have new driveshaft made.
5.) Smile when shifting through 5 forward syncro gears.
Of course it isn't exactly this simple. Here are the Monkey Wrenches...
It is likely that your bellhousing has a bore of 4.686 inches. The adapter plate that AA sels is indexed to 5.125 inches. Either the adapter plate will have to be turned down, or the bellhousing will need to be bored out by a machinest.
GM uses a 10 spline 1 1/8 inch clutch. The Heavy Duty(diesel and V10) NV4500 has a 10 spline 1 1/4 pilot shaft. The pilot shaft and the bearing retainer can be swapped with the dodge gas NV4500 to come up with the correct spline to match the stock clutch.
The part of the bearing retainer where the throwout bearing rides is a little bit thicker than the stock transmission. I believe it is 1.43 inches and stock is 1.373 inches... Don't quote me on those numbers as it has been a while since I measured. This part of the bearing retainer will have to be turned down to use the stock throwout bearing. AA might have a crossover throwout bearing that will work with the NV4500 and your clutch fork with No machining. I wanted to use as many of the stock clutch components as I could for simplicity of ordering parts, so I had a machinest turn the collar down to match the collar of the transmission that was coming out.
The pilot tip of a standard gm transmission is .590 inches. The pilot tip of the Dodge NV4500 is .750 inches. A new Pilot bearing/bushing will be needed. AA can supply this, but they will need the dimensions of the bearing you have. This was the only nonstock clutch component I used on my 1959 GMC conversion.
Why the 1994-1997 Dodge NV4500? The pilot shaft of the dodge transmission is 1 inch longer than the gm version. This allows you to use a 1 inch adapter plate to bolt it to your bellhousing. This version of the transmission is easily adapted to a mechanical speedometer. GM versions and 4wd versions do not have a speedo pinion on the transmission. There are some speedo callibration charts you can look at to get the correct speedo pinion based on tire size and gear ratio. In general adding a tooth will slow your speedo down by about 3%, and removing a tooth will speed it up about 3%. You may be able to be accurate to +/- 1%. The chart is a good place to start, and not all tooth counts are available. You will need to get a speedo pinion housing to put in place of the pulse generator the transmission will have.
A stock gm 4 speed floor shift transmission has the shifter about 4.5 inches from the bellhousing. The 94-97 dodge NV4500 shifter is about 5 inches further back, will end up being about 6 inches further back when using a 1 inch adapter.
The NV4500 is a big transmission. You might have to fabricate a humped floor cover for the transmission. My truck had a flat floor cover. I found a 4 speed floor cover that already had the hump, and simply made a hole for the shifter tower.
John
