Ok so I've got a 85 ranger 4x4 with a 89 mustang HO that had a automatic in it. My truck was origanaly a 5speed now it's a c-6 but I have a options now I have a aode a c-6 currently in the truck and a np435 tranny. So my question is should I keep the c-6 that's in it or change it to one of the other tranny? This truck is not my dd but I do drive on the hwy sometimes. Mainly for 4x4 only. And next ? Is if I use the np435 it's comming out of a full size 83 bronco with a 302 will that fly wheel work blanceing wise with my 5.0 for not? And or will the auto computer currntly in the truck will it like the np435 or will it idle wired or have any other bad affect? Thatnks for anyones input