briane

Would the 1969 Hurst Olds originally have a one- or two-piece driveshaft?

FStanley

one piece for sure.. same as 442 with a TH400 trans

Fred

droldsmorland

All automatics got the "concentric" shafts with the rubber insert. (AKA but not really a two piece). Easily put out of phase with a nasty automatic + dry rot.
All stick cars got the standard single-tube everyone's familiar with.
This statement applies to 68-72 Olds A-bodies

joe_padavano

^^^This. My crewcab dually has a "two piece" driveshaft - there's a center bearing and a third u-joint in the middle. All 68-72 AT cars got the concentric driveshaft with the rubber insulator. It's still considered one piece, since it only has two u-joints.

briane

By 2-piece I was thinking of the concentric shaft design as opposed to two shafts in series. So I gather a concentric shaft is original to the 1968, 69, 72 H/O's. FStanley in your response you were referring to 2 shafts in series?
Thanks.

83hurstguy

The concentric shaft design was original to '68 H/O, can't speak to the others.

joe_padavano

Also my 69 H/O

briane

Thank you Luke. I've been contacting a number of people and it seems at some point, post 1968, there may have been a transition from the 2-piece concentric to 1-piece solid for the 442 TH400 vehicles. More homework to be done here.

briane

Joe, thanks for checking your own '69 H/O. Can you share the build date on your car?

FStanley

don't know what concentric means,etc etc all I know it that it looks like this..

RetroRanger

that looks like a a 2 piece (concentric w 1 shaft inserted into the other and held by a rubber insulator) see the squarer transition near the back of the shaft the 1 piece shaft is all smooth transition like the first diameter change nearer the center of the shaft