I’ve got a 97 Z71 with the 4L60E and a push button NP243 case. I just purchased a 97 C2500 with an NV4500 ( newer style ). I plan on swapping wiring harnesses and the complete dash and column as well as the swing pedals and shifter assembly from the donor truck as well as all related clutch parts. My two main questions are : how hard is it to remove knock outs in the firewall and floor board for the conversion to manual ? My second question is on the NV 4500 2wd to 4x4 conversion. I know I have to change the main shaft and the tail housing over 5th gear and I know I will have to use a 32 spline input on the T-Case ( have already purchased an NP 241 out of a K2500 to get the manual with correct input spline as well as the shifter and interior trim ),. How hard of a conversion is the nv4500 ? I’ve watched videos on you-tube explaining the process and have purchased a few tools ( law jaw puller and bearing separator) to try my first manual transmission disassembly and assembly, or would I be money ahead to buy the parts needed ( approx $250 on eBay ) and have the local tranny shop do the conversion ? Price quoted was $300 plus parts. I’m also buying the cast iron vs aluminum tail housing for this application. Any help or feedback from anyone who has done the nv 4500 2to4wd conversion appreciated.