Dr.Jass
Pastor of Muppets
Moving right along...
I tore into and completely disassembled the '65 A-body 4-speed tonight. It's almost a shame I had to do it, it's so nice inside. The front bearing had been replaced previously, as had the 3-4 shift fork from the looks of things, and it was full of ATF rather than gear oil. The synchronizers, rings, and dogs are in great shape, with just a little bit of sharp edges on the brass teeth. The gears are flawless. Everything was clean and rolled with amazing smoothness, but alas, it had to come apart to change the mainshaft and tailshaft housing to a slip-yoke arrangement. I already bought all the new replacement wear items, though, so they'll be installed upon reassembly in the '68 case. I'll save the parts from this one for a lesser trans, should the need arise.
All the markings on the speed and cluster gears reinforced what we'd determined at the swap meet: It's definitely the 3.09:1 first, close-ratio gearset. That first gear had me rethinking the 4.10s for the track, since the overall final-drive ratio in first is 12.669:1. That's the equivalent of a 4.76:1 axle gear with the '70-older 2.66 gear, or a staggering 5.17:1 with an A904/A727, or the '71-up close-ratio 4-speed. Keep in mind, we're talking about a short, sub-26" rear tire on this car. That's gonna require a very quick 1-2 shift, not far from the starting line, even shifting at 7,400RPM.
Then I thought to myself, "Self, if I can make this thing hook, first gear's gonna be an endless fucking laugh riot." So, 4.10s it is. :dance: Besides, it's not like I don't have more-sane gears lying around that can be swapped in what, half an hour?
I took a few pictures of it after it was apart, but I forgot the camera in the garage... so nothing to post at the moment.
I tore into and completely disassembled the '65 A-body 4-speed tonight. It's almost a shame I had to do it, it's so nice inside. The front bearing had been replaced previously, as had the 3-4 shift fork from the looks of things, and it was full of ATF rather than gear oil. The synchronizers, rings, and dogs are in great shape, with just a little bit of sharp edges on the brass teeth. The gears are flawless. Everything was clean and rolled with amazing smoothness, but alas, it had to come apart to change the mainshaft and tailshaft housing to a slip-yoke arrangement. I already bought all the new replacement wear items, though, so they'll be installed upon reassembly in the '68 case. I'll save the parts from this one for a lesser trans, should the need arise.
All the markings on the speed and cluster gears reinforced what we'd determined at the swap meet: It's definitely the 3.09:1 first, close-ratio gearset. That first gear had me rethinking the 4.10s for the track, since the overall final-drive ratio in first is 12.669:1. That's the equivalent of a 4.76:1 axle gear with the '70-older 2.66 gear, or a staggering 5.17:1 with an A904/A727, or the '71-up close-ratio 4-speed. Keep in mind, we're talking about a short, sub-26" rear tire on this car. That's gonna require a very quick 1-2 shift, not far from the starting line, even shifting at 7,400RPM.
Then I thought to myself, "Self, if I can make this thing hook, first gear's gonna be an endless fucking laugh riot." So, 4.10s it is. :dance: Besides, it's not like I don't have more-sane gears lying around that can be swapped in what, half an hour?
I took a few pictures of it after it was apart, but I forgot the camera in the garage... so nothing to post at the moment.
