Armydillo
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my nv4500 is also cast iron also. it was rebuilt for $1600 w/ american made parts (readily available) and still got a $500 core charge. upgraded input shaft costs a few hundred bucks.
so i'm not sure where you get your parts from, but sounds like you may get ripped off alot.
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quad4x4 dot com people who invented the shaft update, add in a bigger inputshaft its almost $2000
I would not trust your cheap rebuild of a nv4500 with used parts and samll dia input shaft
ATS Standard Transmission Blumethals all are getting $3000 for the nv4500 rebuild and updated with bigger input shafts
I think you got ripped off and dont understand the different types of rebuilds and rebuilts and hate the spicer 3053a
The alum tail shaft on the nv4500 prob also lets it twist and shift around under stress
MY GMC 7000 had a spicer 3053a in it with a 427 cubic inch Holley fuel injection with headers, it regularly pulled out of the hole a 4 axle lowboy with a gross of #120k with the truck trailer d8 cat with ripper on top of it
Gov liq has them all day for $200 to $500, buy toms kit and you have a super transmssion with a huge factory input shaft
There is guy down here who pulls with a 3053a and cummins
He has tons of butt time so he added a Mack truck transmission oil pump inside his spicer 3053a and copper lines routing oil to all of the top gears
The transmssion I quoted was with the parts from quad4x4, I bet if you checked you got stuck with a rebuild of a junkyard core that still has the small input shaft and bad design shaft and 5th gear in it, apples to oranges, but if it works for you thats kewl
I would not waste time or my life with it locking upp personally
Spicer 3053a is a very underrated transmssion, with the update gears and oiling its prob a 200k trans behind a 400 hp 59 or 67 cummins??? We will see, good luck!!