crankshaft vs. crankshaft.......

[challenger71]

I have a question in regards to crankshafts. Is there a difference between a crankshaft for an automatic transmission and one for a 4 speed?  I heard that you have to have the crank drilled for a 4 speed.  IS this true? I recently purchased a 440 that was professionally built 4 years ago and I believe the guy said that he was putting an auto in the car whereas I am putting a 4 speed in mine. Also, is a 1973 440 crank cast or forged stock?

[nivvy]

my block is a 73 and had a cast crank in it.........

[AMXguy]

  Probably someone on here can say for sure but I believe an auto crank has a larger hole in it. I've heard you can put a pilot bushing from a newer Dodge pick up in it and you're set.

[Stacked440]

my 73 block has forged crank as well...and bolts up to my 71 flywheel which bolts up to my 71 4-speed.  I don't think you'll have any problems as long as its a forged crank.

[Killer_Mopar]

4-speed cranks are drilled deeper for the input shaft of the transmission. A lot of cranks were drilled, so even if it was originally an auto it could be drilled. Also, if it isnt drilled you can either cut the end of the transmission input shaft or drill the crank....I cut the end of mine off and havnt ever had a problem. I also recommend ditching the bronze pilot bushing and go with the newer dakota roller bearing.

[Chryco Psycho]

73 could be either steel or cast crank , most steel cranks are drilled for the pilot bushing , most cast are not
 rather than cut the input shaft on the 4 spd I would drill a clearance hole in the back of the crank & use the DAkota roller brg
 if you have a cast crank you may not be able to properly balance the flywheel without disassembling the whole short block & balacing the whole rotating assy

[moper]