usmc320

iTrader: (3)

Obviously you plan on doing it regardless of what anyone tries to tell you. Maybe you have one of those magic unbreakable 65Es.

Anybody else wonder if he'll post up the results when it fails?

bigmac108

A 4l80e would be a much better choice. Transmission are designed for the application. Low gear in a 4l60 has much smaller clutch suface than that of a 4l80 or heavier duty transmission. When taking off from a stand still torque from a diesel is made at a very low rpm which is obviously when low gear is being used. At this low rpm the pump in the transmission isnt making a ton of pressure. Using the same pressure larger clutches would hold tighter than smaller ones. There is a huge difference between a torque curve in a diesel vs. a gas engine. 500ft-lbs is way different if it is made at a lower rpm because the transmission's pump isnt making as much pressure, therefore making the transmission with larger clutches fit the application better. A diesel engine doesn't make as high rpm as gas engines. The pump in the transmission must account for this. That way the transmission is making max pressure at 3000 rpm instead of 6000 rpm. Trucks use low stall converters which use the transmission harder at a lower rpm. This means the transmission must hold well in low gear. Think about it like this. GM uses the 4l60 or 4l65 transmissions in the V6 camaro and the V6 s10. This may be a little overkill but these transmissions weren't designed for lots of power, especially at the low end. This tranny may work for awhile, but with all that work you should consider something heavier duty!