Will a NV5600 (6spd manual) bolt up (replace) a NV4500
 

I have a 95 3500 4x4, Gen 2 engine (stock), 4:10 gears and a max spd of approx. 70 mph. Will a NV5600 fit where the NV4500 is now? I know this has been asked before but I am just getting started in the Cummins world.

Spline to the tcase is supposed to be the same (29-spline).

I've read about a starter spacer because the 6spd flywheel is different?

I don't know about the overall length, if it changes or not.

Thank you U2 Slow:
 

I apperciate your input. I have done some more home work and found out the NV5600 is only a single overdrive. I am looking for a newer version that has a double overdrive I think it is a Asiah 6 spd?? But thanks for the input. It helps.

The Aisin AS69RC has 0.77 and 0.63 overdrive.... but its automatic.
Aisin AS69RC Transmission Specs & Ratios

Have you looked at a governor spring for your injector pump? (more rpm).

Wht about changing your axle ratio? (Been helping my neighbour swap from 4.10 to 3.54 on his ram 3500.)

Well The Aisin is out of the picture.
 

I wasn't aware the Aisin was an auto. As far as the gear change I do a lot of off roading and like the lower gears. I actually just increased my tires to 235/85r16's added 2 inchs to the height and dropped the rpm approx 200 rpm. I usually run about 65 - 68 and that will have to work. Thanks again for the information.