UCA in a 68

[Shovelrick]

I bought a nice used set of rear Dbl adj arms for the rear of my 68 from a member on OCS at a good price, I searched for info and I think the best info I found was from an '23 thread Brian posted so anyway I'd like to get some real world opinions on this type of upper arms, Good?Bad? I have boxed stock lowers and Energy Susp in both upper & lower

 

[cheveslakr]

Mine are UMI and have the urethane cushion vs the roto-joint. I like mine, they give full adjustment of the pinion and stopped the hop completely.
You may not have that issue with the traction bars. IMHO, any solid link just compounds the shock and strain on the next moving joint, so I like to keep all joints a bit cushy.

 

[Shovelrick]

Mine are UMI and have the urethane cushion vs the roto-joint. I like mine, they give full adjustment of the pinion and stopped the hop completely.
You may not have that issue with the traction bars. IMHO, any solid link just compounds the shock and strain on the next moving joint, so I like to keep all joints a bit cushy.

I read a thread Brian made in '23 at OCS how his uppers bolts came loose and woobled or elongated the upper frame holes, I may just buy replacement upper roto "heads"? I'll post a pic and they're also made by UMI

 

[Shovelrick]

The red circle would be what I'd have using the UCA the way they are now or at $70 per side I could change to the UMI roto ends, the blue circle at the 12 bolt has Energy Susp poly mount in it now, guess I could try them as is for now, guy I got them from just said the only reason he removed them was he put a different rearend under his 70 and needed a different type of CA's Good lock washers and loctite should keep bolts from coming lose