Pilot bushing for 4 speed swap
First, I can take no responsibility should you cut your input shaft too short. It is solely up to you to where you cut it should you choose to do so.
So let's go at it a little differently.
I will afford this example of measurements I have taken.
On a 4 speed I have, the UNCUT input shaft checks 8.625" from the case face.
A Mopar bellhousing is 7.380" per the Mopar Performance Chassis Manual.
8.625" - 7.380" = 1.245"
So the input shaft extends past the bell housing 1.245" when the bell and trans is assembled.
The crank flange of a 440 I have extends .875" from the rear block face.
1.245 + .875" = 2.120"
So 2.120" would be the minimum depth the bore in the crank needs to be for THIS trans.
You will need some extra depth for which ever route you decide as to not bottom the input shaft on the crank bore.
Does this make sense to you?
Your image with color representation..........
FWIW........
First, I can take no responsibility should you cut your input shaft too short. It is solely up to you to where you cut it should you choose to do so.
So let's go at it a little differently.
I will afford this example of measurements I have taken.
On a 4 speed I have, the UNCUT input shaft checks 8.625" from the case face.
A Mopar bellhousing is 7.380" per the Mopar Performance Chassis Manual.
8.625" - 7.380" = 1.245"
So the input shaft extends past the bell housing 1.245" when the bell and trans is assembled.
The crank flange of a 440 I have extends .875" from the rear block face.
1.245 + .875" = 2.120"
So 2.120" would be the minimum depth the bore in the crank needs to be for THIS trans.
You will need some extra depth for which ever route you decide as to not bottom the input shaft on the crank bore.
Does this make sense to you?
Your image with color representation..........
