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The NV 4500 had two different shift tops on it, a round one and a square one, correct? Is that the only difference between the two? And are the tops interchangeable? Will either one fit in all the 2nd gen trucks?
 

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The tops will interchange, but not the only difference. I'm not sure of the year, but the older NV4500 had a problem with 5th gear nut coming loose. They tried to fix the issue by changing the output shaft design, but later found that the problem still existed, but on a smaller scale. Just some info that I've found over the years, doesn't effect interchangeability.
 

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There are 2 "tops" one the shifter comes off by unbolting one it doesn't. Get the one where the shifter unbolts so you can install a short shifter. Oh an all 4500s had 5th gear issues, there is an upgraded nut to install to fix the issue.
 
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