Hey all,

Here is what I have, 68 SS 505 C.I.D Big Block 650 HP 695 LB torque, DSE mini tubs TH400 3500 sthall 4.10 Dana. I am thinking of adding a high end overdrive so I can get a little bit more street out of the car, has anyone used an aftermarket O.D with this much horsepower before?
This is unit I am thinking of using. PLEASE let me know your thoughts.

Thanks,
CM2RAS
http://www.drivetrain.com/new_overdrive/GM3speedautomatic/overdrivegm3spdauto.html

GearVendors

GearVendors
yup

Your selected web page to check out is the Gear Vender OD. A very stout unit and plenty strong enough for your application.

A friend had one of these OD units in a Chevy 454 Dually 1 ton tow truck for years with no problems. He was running back and forth through 3 states pulling a 28 foot loaded enclosed trailer.

GV claims they are good for 1200 hp in stock form. We have one behind a 406 with 4.10s and like it a lot. Not close to your hp or likely torque however.

Thanks everyone, it is good to see I am looking in the right direction.

CM2RAS

Gear vendors is the way to go for big hp and torque. They are very strong and trouble free unlike 700r4s etc.