little help with a driveshaft

[ghoti]

just bought a 78 malibu it has a 8.5 BOP rearend i think? from what i could find on the gear set part number comes back as 8.5 4.10 i dont think it has c-clips. it has a long tail 350 tran and a 50in driveshaft center to center. my guess is i need a 53in shaft for a short tail tran. but that doesnt match up with what ive read here and other places. i thought i would need a 51.5 inch driveshaft any thoughts. thanks

 

[SSedan64]

8.5" is 1" longer at the Yoke compared to a 7.5" rear.
Short TH350 has 6" tail, Long tail is 9".
DS should be 1" shorter than stock with 8.5" & Short TH350..

 

[ghoti]

8.5" is 1" longer at the Yoke compared to a 7.5" rear.
Short TH350 has 6" tail, Long tail is 9".
DS should be 1" shorter than stock with 8.5" & Short TH350..

yes i agree with this and should need a 51 1/2 inch DS. but from what i'm seeing its going to need a 53 inch. that or i have a bad tape lol!!!

 

[SSedan64]

Don't forget the .75" - 1.00" Slip Yoke to Output Shaft clearance, to allow for suspension travel.

 

[ghoti]

yes it was good. guess i will see this weekend when the 406 goes in. headers came today so im ready for the swap

 

[ghoti]

53 inch driveshaft worked fine??? crossmember seems to be in stock location, rearend is a 8.5 maybe ill figure this out one day lol!!