76 140 auto versus 71 140 4 speed

[71GTKammback]

My original 71 140 4 speed burns a lot of oil. Nearby is a good running 76 140 auto. Does an auto trans engine work in a 4 speed car or is the back of the crankshaft different to accomodate the clutch versus torque converter? Thanks

[hammerdown7]

The cranks are the same, just switch the four speed parts over after removing the auto flex plate/torque converter. If you haven't done this before be aware the torque converter is full of trans fluid.

Dick

[67shovel]

You may need to install a pilot bushing in the back of the crank shaft to engage with the 4 speed input shaft.

[rpoz-29]

If your '71 engine is original and a 2bbl, hang on to the camshaft. The '71 2bbl cam was hotter than any other factory cam.

[71GTKammback]

Meaning i woukd have to drill a space for the pulot bushing or just install one in the already open hole? Thanks

[hammerdown7]

You may need to install a pilot bushing in the back of the crank shaft to engage with the 4 speed input shaft.

Thanks for mentioning that, I didn't! The hole will already be in the crankshaft for the pilot bearing.

Dick

[hammerdown7]

If your '71 engine is original and a 2bbl, hang on to the camshaft. The '71 2bbl cam was hotter than any other factory cam.

Bill, good point on the cam, at the least for resale. The '76-'77 140's used hydraulic lifters, I don't know if the early cams will work with them.

Dick

[kgroombr]

Bill, good point on the cam, at the least for resale. The '76-'77 140's used hydraulic lifters, I don't know if the early cams will work with them.
Dick

I am pretty sure you can use a solid lifter cam in a 76/77 head as long as you use the solid lifters, but not the other way around.

Ken