Info on 2 Speed Rear for C30 ??

[Elephanthead]

For the price of that overdrive I would just buy a new truck, or new tranny. It defiantly would work though. I need bigger tires.

[haysonj]

Originally Posted by Elephanthead

For the price of that overdrive I would just buy a new truck, or new tranny. It defiantly would work though. I need bigger tires.

I have 4.09 gears with 35 inch tires behind a GV OD. this truck will tow my boat up hills at 55 all day plus it cruises at around 1900 rpm. Disconnect the boat and it will snap your neck between every gear. set it on auto and it shifts like a six speed. Like I said earlier if you can afford it IMO there isn't a better setup. Its way stronger than a OD trans.

[4x4longbed]

As mentioned a Gear vendors Overdrive is probably the best way to go, however....I worked for Eaton Corporation for 15 years and several C-30 trucks were fitted with Eaton 2 speed rears, which are electric shifting by the way. The Allentown Region for the truck division did the conversions, the Region Service Manager at that time behind these was a man named Tom Hoy, I know he is retired, I can probably track him down. What I remember is Tom used a Eaton 2 speed center then "re-tubed" it with the correct tubes and wheel end equipment. Now here is what most missed there were a varity of ratio's available one low and one high, I do not remember all of the combinations but the are listed somewere I am sure. It would be a neat conversion, if you want somwthing different. In the late 80's he was getting 25 plus mpg from a dually.

Good luck!