Overdrive trannie
Postmaster
Joined: Apr 2002
Posts: 3,613
Likes: 6
From: Coal country
Brother John: I must respectfully disagree with you. From '65 to '72, the truck overdrive transmission is substationally heavier than the car overdrive.
It is in principle identical, and many of the external parts are identical, but the transmission and the OD unit on the back are not the same.
To tell the difference:
The car transmisison will have a slip joint in the rear, and will have a relatively flat bottom on the transmission casing. The OD case will have a casting number of R-10 or lower.
The truck transmission casing will look like a fat juicy catfish, with a big belly. It will have a bolt-on yoke in the rear, and the OD unit will have a casting number of R-11.
It is in principle identical, and many of the external parts are identical, but the transmission and the OD unit on the back are not the same.
To tell the difference:
The car transmisison will have a slip joint in the rear, and will have a relatively flat bottom on the transmission casing. The OD case will have a casting number of R-10 or lower.
The truck transmission casing will look like a fat juicy catfish, with a big belly. It will have a bolt-on yoke in the rear, and the OD unit will have a casting number of R-11.
Postmaster
Joined: Apr 2002
Posts: 3,613
Likes: 6
From: Coal country
Now to make it really confusing:
1. Some cars in the '60s used the weaker R-10 electrical overdrive.
2. Some short bed trucks with OD transmissions MAY have the weaker car electrical type, with a slip joint.
3. The truck OD transmissions in '65 and '66 were an electrical OD.
4. They were available in trucks up to '72.
5. The cars could have come with a non-electrical OD, where the final gear was an OD gear, rather than having an extra OD unit stuck on the back of the transmission.
6. I do not know of any '65/'66 trucks which came with a non-electrical OD - but that doesn't mean the factory didn't make them, just like the factory F-100 with a 427 we all know about but which it didn't make, either.
7. Which means the '67 - '72 trucks could have come with a non-electric car overdrive.
We need the numbers off the side of your transmission to be accurate in our assistance to you.
1. Some cars in the '60s used the weaker R-10 electrical overdrive.
2. Some short bed trucks with OD transmissions MAY have the weaker car electrical type, with a slip joint.
3. The truck OD transmissions in '65 and '66 were an electrical OD.
4. They were available in trucks up to '72.
5. The cars could have come with a non-electrical OD, where the final gear was an OD gear, rather than having an extra OD unit stuck on the back of the transmission.
6. I do not know of any '65/'66 trucks which came with a non-electrical OD - but that doesn't mean the factory didn't make them, just like the factory F-100 with a 427 we all know about but which it didn't make, either.
7. Which means the '67 - '72 trucks could have come with a non-electric car overdrive.
We need the numbers off the side of your transmission to be accurate in our assistance to you.
