You more than likely have an Eaton HO52 you won't destroy it time with a TH350. Your biggest problem is the rear axle ratio, it is probably 4.56 or higher. The best gear ratio you might find is 4.10. I would look at putting a 700R4 in it. The 700R4 overdrive would get your highway rpm down to 2200-2400.

Larry


I don't own a vehicle that isn't old enough to drink.