Tranny swap

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Oct 16, 2018 | 06:41 AM

Kidmister

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Tranny swap

I have a 63 Unibody that now has a 1976 Chrysler/Nissan SD33 deisel engine installed. I think it came from an International Scout. Top speed is about 65 mph and that is at high rpm. The tranny has a super low granny gear that is isles. Any ideas on how to increase the speed by tranny swap or ?.
thanx

Oct 16, 2018 | 08:13 AM

'65Ford

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I'm guessing you have a T19 tranny since that's what the SD33 was mated to in in the Scout. Since the T19 is synchronized in all 4 years you could try changing the rear axle ratio a little. I wouldn't change it too much or the SD33 might not keep the truck moving in 4th at freeway speeds and it's a long step back down to 3rd...especially for the relatively narrow power band of a diesel.

BTW, granny gear is terrific for starting out with a heavy trailer or crawling through a field with a load of firewood. Normally don't use it when running empty.