I'm looking at possibly acquiring a 6.5 turbo engine from an upper 90's dually box truck. From my understanding it's the non egr L65 engine. It would go into my 86 M1008 which I drive quite often. The truck still has the 4:56 gears and I run KM2 255 85 16's. Max speed that I drive is 55mph. Any issues with running a 6.5 turbo at those speeds with the 4:56 gears?