I just did this exact swap. I thought I was luck since I live in AZ and could just go to DVAP
http://www.dvap.com/. I walked the yard and looked at 15 B Bodies of charger and road runner vintage. Thought I could just grab a driveshaft from a Big block car. Problem is the stupid large and small yokes and what rearend is in the car. I did not exactly find what I wanted. I did however find a 727 yoke with the long shell extension that uses the smaller u-joint. Score for $5. Love that yard!
Made trip to AZ Driveshaft.
http://www.azdriveshaft.com/index.html Talked to them and initially had them shorten my 319/904/9 1/4 rearend driveshaft 3.62 inches (dimensionally difference between the 904 and 727). The wonderful lady said I really needed to measure but that she would do it anyway. 110.00 and was done in a day. Tried to bolt it in and wala to long. Back to shop, was honest and told them I was wrong. Gave them the measurement from the tail shaft seal to the lead edge of the rearend yoke and they cut to that length. Went in next day and they told me 45.00. She told me I was honest that it was my fault and they appreciated that.
Here is where my situation was odd. The 73 RR has a 360 installed . The kid I bought it from installed the fresh 360 and mated the original 904 and torque converter into car. You guessed it amazing vibrations.
I started shopping for torque converters in a reasonable price range. I found DACCO has some options for sub 100.00 and their techs are good. They also sold me the rebuild kit.
http://www.daccoinc.com/. I was able to find a "large ring" aka 10 1/2 high stall converter PN 400 I was told by there techs its 1800.
http://www.daccoinc.com/pdfs/catalogs/40th Anniversary Catalog.pdf. There is also some deal with the large butterfly weight and small dual weights so call them about your selection. Esssentially I got the converter locally for 87.00 new with 12 month warranty. I think my rebuild kit was 110 and is the same kit that autozone and Oreillys sell. They allow you to mix and match too. If you have one in your city they sell to the public and really helped.
Now there are also 4 flywheels. Cool thing is they are like 18.00 a piece and dayco can get either. There is a large and small one and offset and not offset crank. Just and FYI
My first solo rebuild. Installed the tranny was cake! Need new plastic bushings but that is easy to. Used new tranny mount but bolts into same spot. Linkage was all the same.
First test drive no vibration, I have all gears, but still might be low on fluid as my 727 came out of a van and the dipstick was not the same as the 904. Minor. I just wanted to be able to move the car our of the garage at this point. I really like the feel of the converter for a toy street driver. I still need to play with this more and i also did the Transgo TF2 and its not shifting hard but that may be fluid or that I dicked with the line pressure. or band adjustment.
