700R in a 65 Bonneville

[ThomasL]

I am seeking articals, reference materials and general advice on swapping in a 700R Transmission into a '65 Bonneville. Right now it has the stock 389/T400, but I am considering a swap to a 455. Any assitance/advice is welcome.

Thanks,
Tom

[Stu Norman]

There are many articles out on the internet on how to do the swap. It isn't hard, technically speaking. You'll have to fabricate the shift mechanism, have a custom driveshaft made and fabricate a transmission mount.

Do keep in mind the transmission isn't designed to live behind a 455 and might not be able to withstand the torque.

[ThomasL]

Thanks. I share the concern about the tranny holding up to the torque of the 455, but I do not want to go to a corporate small block, either. Another alternative I'm considering is an aftermarket OD unit. I am restofying the old bonnie 4 dr back from parts car status to hopefully a reliable and practical daily driver with updated powertrain and disc brakes.

Tom

[Stu Norman]

Something like a Gear vendor OD unit (sits behind the TH-400) is very strong.

But, it's also very expensive.

I would just keep the TH-400 and put in a hugh rear end, like a 2.87. The engine will have enough torque to get you going, but you won't win any drag races.

[ThomasL]

'Preciate the advice!

Tom

[stevep]

Some of those 65's came through with a 2:41 rear and moved the car fine and got decent gas milage. If you are just going to drve the car, it may be OK the way it is.

[Stu Norman]