Shock recomendations, 68 Camaro

[BTR69]

A couple weeks ago I pulled the existing shocks off. Even though they look like hell, they seem to extend & compress nicely on the bench withough any issues. I'm beginning to think it's something in the pinion area. The thumping is the same as when I had a bad shock bushing in one many years ago. With shocks on or off, I can bounce the rear up & down without the thumping. The U joint appears good by just looking at it & it doesn't appear to have any play in it, but I hear a similar thump, just not as loud, at the pinion when I rotate it by hand. I haven't had time to spend on it so it's been sitting waiting for me to get back on it. The only time I hear the thumping is when driving over any size bumps in the road. The return road can just about give you a headache with all the high - low spots & noise it creates. It's going to stay parked until I can be sure it's not going to come apart. Going to cross my fingers it's the U joint at this point. Hopefully in the next couple weeks I'll be able to spend some quality time with it again. Thanks for the tip with the 90/10's. I priced some, just haven't bought them yet.