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| | | | Joined: Aug 2022 Posts: 100 'Bolter | | 'Bolter Joined: Aug 2022 Posts: 100 | I’m planning to replace my original 1946 Chevrolet AK 4spd non-synchro “crash box” transmission, with an original 1946 3spd transmission. If I’ve researched correctly, this is a direct fit R&R. Is that correct? Any changes needed or are they an exact swap?
Care taker of a 1946 1/2 ton. Pretty much period correct original. Danny T, from B’ham, Al
| | | | | Joined: Mar 2004 Posts: 6,212 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,212 | Is the 3-speed trans a truck floor shift trans? If so it should bolt up to your bell housing. I don't know if the floor hole is in the same location, but that would be an easy fix... Mike B  | | | | | Joined: Aug 2022 Posts: 100 'Bolter | | 'Bolter Joined: Aug 2022 Posts: 100 | Is the 3-speed trans a truck floor shift trans? If so it should bolt up to your bell housing. I don't know if the floor hole is in the same location, but that would be an easy fix... Mike B Yes, all the 41-46 AK trucks were floor shifts. Base was the std 3sd with synchronized 2nd and 3rd gear. The optional transmission was the heavy duty 4spd with non-synchro on any gear. Straight cut gears with no synchros, not even on 4th gear.
Last edited by Dltalfa; 02/01/2023 2:33 AM.
Care taker of a 1946 1/2 ton. Pretty much period correct original. Danny T, from B’ham, Al
| | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | The only thing you will need to address is the master cylinder mount.
The four speed is wider than the three speed, so the mount wont quite reach the new transmission.
You can simply put shim washers between the mount and the transmission, or find a three speed mount.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Aug 2022 Posts: 100 'Bolter | | 'Bolter Joined: Aug 2022 Posts: 100 | The only thing you will need to address is the master cylinder mount.
The four speed is wider than the three speed, so the mount wont quite reach the new transmission.
You can simply put shim washers between the mount and the transmission, or find a three speed mount. Thanks Pre ‘68 Dave. No difference in Torque tubes are there?
Care taker of a 1946 1/2 ton. Pretty much period correct original. Danny T, from B’ham, Al
| | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | The front yoke that bolts on the transmission is different between three and four speed, but the rear yoke and torque tube are the same, for 1/2 tons anyway.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Aug 2022 Posts: 100 'Bolter | | 'Bolter Joined: Aug 2022 Posts: 100 | The front yoke that bolts on the transmission is different between three and four speed, but the rear yoke and torque tube are the same, for 1/2 tons anyway. Thanks again, Pre ‘68 Dave. So, I assume the front yokes will interchange, is that correct? Are you talking about the yoke that attaches to the universal joint?
Last edited by Dltalfa; 02/02/2023 2:00 AM.
Care taker of a 1946 1/2 ton. Pretty much period correct original. Danny T, from B’ham, Al
| | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | I assume the front tiles will interchange, is that correct?
Are you talking about the yoke that attaches to the universal joint? Not sure what you mean by tiles? And yes, the universal joint yokes.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Aug 2022 Posts: 100 'Bolter | | 'Bolter Joined: Aug 2022 Posts: 100 | Sorry about that. Fat fingers + autocorrect!
I didn’t mean to type “tiles”. It was supposed to be “yokes”. Sorry about that.
Last edited by Dltalfa; 02/02/2023 2:03 AM.
Care taker of a 1946 1/2 ton. Pretty much period correct original. Danny T, from B’ham, Al
| | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | The front yoke does not interchange. The rear shaft of the two transmissions are different.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Aug 2022 Posts: 100 'Bolter | | 'Bolter Joined: Aug 2022 Posts: 100 | The front yoke does not interchange. The rear shaft of the two transmissions are different. One last question…..is the “bell” that seals the torque tube to the transmission the same for both 3spd and 4spd…..or will I need to replace it too?
Care taker of a 1946 1/2 ton. Pretty much period correct original. Danny T, from B’ham, Al
| | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 |
See the USA in your vintage Chevrolet! My Blog | | |
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