I agree the Gear Vendors overdrive seems pricey, but if you already have a stout 3 speed transmission the cost is comparable to a complete change out.
It will cost you on the order of $2500 for a Tremec setup or about the same for say a Lentech AOD and everything to install it.
I am fairly serious considering one for my 69 Mustang with a C-4. Might actually be a bit cheaper if you forget the original cost of the C-4. Plus six forward gears is pretty cool.
As far as strength goes I talked direct with the guys at Gear Vendor and they claim the overdrive unit is very stout. They claim the unit I would get for a C-4 is the same overdrive used in some 6-second 1/4 mile drag cars without a failure. I think if the overdrive unit can withstand a 6-sec drag car it can stand anything I can throw at it.
Also the install would be very easy for my C-4. Far easier than a switch to a Tremec or even a AOD.
Dale302
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1969 Mustang Fastback and 1970 Mustang 5.0 EFI Coupe
www.geocities.com/70coupe
<font size=-1>[ This Message was edited by: Dale302 on 1/4/02 12:45pm ]</font>