Ryan Weaver's 1969 Olds Cutlass S W31 Club Coupe

[83hurstguy]

Olds O-type rears have positively retained axles, which is nice, and aftermarket axles are available. The downside is the limited availability of new gear sets (3.42/3.91 only). Older (some NOS) 4.33 and 4.66 sets are around as not many people use them.

The Chevy 12 bolt is typically C-clip from what I've seen, and the value is higher, so they are more expensive up front once you buy the housing and have new ends welded on for positively-retained axles. But, you have any gear ratio available and plenty of parts availability.

Just remember if you plan to ever switch back and forth you have U-joint differences and a driveshaft length change. I don't see either option being a strength issue for PSMCDR, though I wouldn't recommend being on C-clip axles with a 4 speed car (my opinion, I'm sure 10 people will tell me I'm wrong). There are people that have broken axles on polyglas. I wouldn't worry about it from a purist standpoint, just whatever works better for you. I haven't decided what I'm doing with mine, though I have to decide somewhat soon.