cptn60
04-22-2009, 14:00
Hi everyone. Doing a repower on my 83 c35 dually(former 454). Using an 85 j code engine presently hooked to an sm465, then a 4.10 d70. My question is; which would be more efficient to reduce rpms to the 1800-2100 range at highway speed? A 3.54 ratio is available aftermarket(Summit rcg) also have access to a mid 90s Dodge nv4500. Or just do both? Vehicle is mostly daily driven in town with some towing, but girlfriend lives a good hour and a half away and REALLY likes riding in the truck. Thanks, George