440 auto to 4 speed

[440magnum l2]

I want to mate a 4 speed trans to a 440 auto... 440 is a 68 build date. will a pilot bushing fit in the crank or does the bushing hole have to be honed out? Is there an alternate way..maybe a newer style roller bearing?

[ACUDANUT]

No, you good to go with a 68 Block. Do you have the complete set up ?  It ain't cheap or fun. imo

[John_Kunkel]

All '68 cranks will be drilled for a pilot bushing but not all auto trans cranks will be reamed to final size (.937") for the bushing. It's impractical to try to enlarge the hole on an assembled motor.

If not reamed to final size the newer style bushing/bearing that fits in the converter register is the easiest way to go.

[440magnum l2]

Thanks guys! John Kunkle, what year of bearing would fit in the crank register?

[A383Wing]

the auto crank is not drilled deep enough either...input shaft will bottom out on end of crankshaft

[440magnum l2]

Charger is an R/T 4 speed. 440 is year correct and fully rebuilt but had the auto 727. I have the original 4 speed but original 440 was MIA. Don't want to disassemble if there is an alternate way. If they have a roller bearing that fits in the converter registry...I wouldn't have a problem going that route!

[A383Wing]

roller bearing works, but the input shaft is too long for the automatic crank...it's not drilled deep enough

[John_Kunkel]

My experience with forged cranks is they are drilled plenty deep enough, even the auto trans cranks. The unfinished hole is still larger in diameter and depth for the pilot shaft on the trans. However, the cast cranks are seldom pilot drilled so the register-mounted bearing won't work without bobbing the pilot shaft.

The subject motor is a '68 so it will definitely be drilled so either option is available.

[Ghoste]

What is the depth needed to ensure the input doesn't bottom?  Would 1.700 be sufficient?

[ACUDANUT]

My experience with forged cranks is they are drilled plenty deep enough, even the auto trans cranks. The unfinished hole is still larger in diameter and depth for the pilot shaft on the trans. However, the cast cranks are seldom pilot drilled so the register-mounted bearing won't work without bobbing the pilot shaft.

The subject motor is a '68 so it will definitely be drilled so either option is available.

I agree. 

[440magnum l2]

Thanks guys...you've been a fountain of knowledge! The engine install shall be a piece o cake!

[mopar0166]

great stuff, one day I may do the same

[John_Kunkel]

What is the depth needed to ensure the input doesn't bottom?  Would 1.700 be sufficient?

Measured from where?