the NV4500 is one of the strongest manuals trans to use behind a cummins i am curently doing a conversion aswell i am putting a cummins into a 1988 chevy light 3/4 ton and i am going to use a NV4500 they are cheaper then a NV5600 and parts are easyer to come by for them

 

true if u want manual, does anyone know were i can get some info on the diff from the gas allison an diesel allison trans. an if theres no diff i was wondering what should i up grade before i put the cummins in. like whats the weak parts of the trans thanks

 

hi i saw on a thread you posted that your were doing a 12 valve swap in your truck. i am interested in doing the same to my 93 sierra 6.5l. i was wondering how involved it was for you and if you could give me any advice on doing mine? were there any major inconviences/problems you ran into? thanks