I spent some time digging on this further last night. Yeah you're going to have a nightmare of a time getting a more modern transmission bolted up to your pre 60 block.
The hydra-matic with it's 4 forward gears and very steep 1st gear is a much better gear spread then the more modern 4 speed transmission with 3 forward gears and an overdrive. I would have your factory transmission rebuilt a look to a rear gear change if you desire a better highway cruising rpm. Do you know what gear ratio is in the rear-end?
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-Jason
1969 Pontiac Firebird
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