hogman
I have a flex plate from a 290 cu. in. motor with a manual trans. Will that fit a 401 that had an automatic okay?
tufcj
NO.
All Gen2 and Gen3 AMC V-8s are externally balanced. The harmonic balancer and flywheel/flexplate are displacement specific. You will need a 401 flywheel/flexplate.
Also, the crankshaft flanges are different (unless you have a 71 401). The 290 flywheel won't fit over the flange of the 72-up crank.
Bob
tufcj
hogman
Thank you Bob! I have a lot to learn but thankfully there are many forums on AMC motors.
Wrench Man
And manual transmissions don't use flexplate's, they use flywheels.
