TF 727 Push-button Output Hub Converting to U-Joints
The issue I'm having is the 1964 push-button 727's fixed output flange yoke, which I picture below. I'm converting to a slip-yoke drive shaft that will require a flange yoke to bolt to the output flange. The bolt circle is 3.25", and the inside of the lip around the perimeter that creates a well where the factory ball-and-trunnion flange sat is 3.94" diameter. Since these transmissions never came with a slip-yoke driveshaft, I'm stuck piecing something togeter. I've looked through both Spicer, Neapco, and Moog catalogs and find only one option with close to 3.25" bolt circle and just over 4" outside circle that can be sanded down.
Spicer 2-2-1769
-1310 series
-3.20" bolt circle
-4.016" outside circle
The issue is that this flange appears to have been discontinued a while ago since I cannot find it anywhere online new or used, and I called different suppliers without luck.
I prefer to run a 1350 u-joint, but there is only one with a 3.25" bolt circle that is both way too big in outside circle and also discountinued and out of stock everywhere I checked:
Spicer 3-2-189
-1350 series
-3.25" bolt circle
-4.5" outside circle
With the 4.5" outside circle I'd have to mill off the lip around the 727's flange and rely on the bolts to keep the flange yoke centered/captured, which I think is a bad idea since it could walk around under high torque situations. I might be able to save some of the lip that doesn't interfere on the narrow sides to help lock in the flange, but I doubt there will be much lip left. There isn't a pilot on the 727 flange.
How have others with 450 torque + engines running earlier fixed output flange 727s with a u-joint driveshaft dealt with the output flange to driveshaft front flange configuration? The easiest way and the only way to capture the front driveshaft yoke flange with the 727's flange, but the part appears unobtainable unless I luck out and one pops up on ebay.
I appreciate the feedback.
The issue I'm having is the 1964 push-button 727's fixed output flange yoke, which I picture below. I'm converting to a slip-yoke drive shaft that will require a flange yoke to bolt to the output flange. The bolt circle is 3.25", and the inside of the lip around the perimeter that creates a well where the factory ball-and-trunnion flange sat is 3.94" diameter. Since these transmissions never came with a slip-yoke driveshaft, I'm stuck piecing something togeter. I've looked through both Spicer, Neapco, and Moog catalogs and find only one option with close to 3.25" bolt circle and just over 4" outside circle that can be sanded down.
Spicer 2-2-1769
-1310 series
-3.20" bolt circle
-4.016" outside circle
The issue is that this flange appears to have been discontinued a while ago since I cannot find it anywhere online new or used, and I called different suppliers without luck.
I prefer to run a 1350 u-joint, but there is only one with a 3.25" bolt circle that is both way too big in outside circle and also discountinued and out of stock everywhere I checked:
Spicer 3-2-189
-1350 series
-3.25" bolt circle
-4.5" outside circle
With the 4.5" outside circle I'd have to mill off the lip around the 727's flange and rely on the bolts to keep the flange yoke centered/captured, which I think is a bad idea since it could walk around under high torque situations. I might be able to save some of the lip that doesn't interfere on the narrow sides to help lock in the flange, but I doubt there will be much lip left. There isn't a pilot on the 727 flange.
How have others with 450 torque + engines running earlier fixed output flange 727s with a u-joint driveshaft dealt with the output flange to driveshaft front flange configuration? The easiest way and the only way to capture the front driveshaft yoke flange with the 727's flange, but the part appears unobtainable unless I luck out and one pops up on ebay.
I appreciate the feedback.
