Drive Shaft length

[IamWill80]

I have a 1971 firebird 400block auto TH400 w/12 bolt. Does anyone know off hand how long of a Drive shaft I need to order?

 

[melsg5]

i cannt tell you the length but www.amesperf.com lists 2 of them, you need to know the number of splines on the yoke. Found this for measuring what you need

http://www.dennysdriveshaft.com/app/webroot/img/File/how_to_measure_diagrams/b.html