The ChevyBaker was sold with a Dana 41 with a 4.55:1 gear ratio. (51/11 gearing)
This was great when combined with the original flat 6 and standard transmission with over drive. The ChevyBaker now has a SB 327 and Turbo 350 automatic without over drive. FYI: 65mph means 3779rpm.
The original idea was to replace the rear axle with a Ford 8.8 that was purchased on ebay. In conversation with Jim (great guy) at Cal Speed & Performance it will makes more sense to replace the Turbo 350 transmission. A 200R4 is roughly the same size but unlike the TH350 has an overdrive gear. This gear is at 0.67:1 which will lower the 65MPH RPM to 2532 and should be a much better engine RPM for highway driving. This will also allow for the ring/pinion gears or a replacement rear end, to be installed at a later date.
Here is the RPMs at different Trans/Diff/Tire combinations
Update 4/11/24:
Picking up rebuild 200R4 transmission with torque converter today.
Confirmed delivery of the ChevyBaker and 200R4 on 4/22/24.
Update 1/19/24:
Delivered the ChevyBaker to the shop because Friday COB is the same as Monday morning. That and I had help getting back to the house and Monday would be a hassle. I did however drop off the new Transmission bright and early on my way to the office. Damn those headlights still look awesome with their driving rings (Headlight and Bezel Project )
Update: 4/22/24:
Delivered transmission with associated part.
Here's hoping the drive shaft does not need modified.