What is the best available NV4500 main shaft? - Dodge Cummins Diesel Forum

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Old 08-20-2013, 01:35 PM   #1 (permalink)
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What is the best available NV4500 main shaft?

I am in the process of rebuilding an NV4500 for my 94 12 valve, and I need to find a new mainshaft for it. I recently bought the tranny used, so I don't really know its history. The splined end of the countershaft sheared off, and the lower fifth gear was damaged. The tranny already has an aftermarket fully splined mainshaft in it, so I thought I was good to go in that department, but upon closer inspection the bearing surface on the nose of the shaft where it fits into the input is badly pitted, and the rear bearing race has been spinning on the shaft.

I have spent several hours reading on here, and on other forums, but have not found any comprehensive answers to my question.

Fully splined main shafts are available from several sources:
Several people have recommended Standard Transmission and Gear which runs about $290. Dodge with Cummins Diesel
quad4x4.com Has one for $216.44 QU10011 FULL SPLINE 4X4 SHAFT in NPG/NVG D5
And I can find them on ebay for as little as $129.78 Dodge NV4500 Transmission Updated Mainshaft 4WD 27173 | eBay

These are all fully splined shafts but I couldn't find any specifics listed on any of the product descriptions. Where they are made, steel quality, etc. I don't want to cheap out, but for all I know the $130 ebay ones could be made in the same factory as the ones being sold for nearly twice as much from Standard Gear or other sellers.

I would love to get some useful info on which is best, or if there is any functional differences between whats available from these sources or any others. Specifically, are there any available that have a press fit splined section for fifth gear.

Also, (and this is probably my biggest question) has anyone been running inexpensive ones from ebay for an extended period of time, with positive or negative results?

Any useful info will be much appreciated. Thanks,

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