2wd 1/2 ton control arms....is there an HD version?

[88Jimmy4x4]

My 1976 is a heavy half and has the 56" rear leafs, bigger brakes etc. I swear I read on here that either the upper or lower has an HD option with bigger shaft but I cant remember for sure. If there is a difference how can I tell what I have?

[lolife99]

Never heard of a HD control arm.

[88Jimmy4x4]

me either, but I swear I read Ken post that. I do know when searching for bushings it specifys 1-1/2" shaft for LCA and why would it specify that if there wasnt something different. I just want to make sure before I buy new parts.

[N2TRUX]

Ken? Which one..

The bushings, shafts, B/Js are different on the larger trucks. As far as I know the control arms are the same, even on the C30.

[88Jimmy4x4]

Originally Posted by N2TRUX

Ken? Which one..

The bushings, shafts, B/Js are different on the larger trucks. As far as I know the control arms are the same, even on the C30.

yes you lol....probably been a year ago, maybe you were recommending someone to upgrade to the bigger brakes while they were adding spindles I dunno, swore it was larger bushings/shaft size......oh well....its heck to get old

[rustyrexiusrodz]

yes there is such a thing as a 1/2 ton hd truck that chevy made in the 73-80 years
don't know about the shaft though the innner and outers are bigger. i will let you know this week as i'm rebuilding the truck suspension. i take pics too

[rustyrexiusrodz]

if you had an hd truck the glove box should tell you it it is that model should say hd option.

[lolife99]

Originally Posted by 88Jimmy4x4

yes you lol....probably been a year ago, maybe you were recommending someone to upgrade to the bigger brakes while they were adding spindles I dunno, swore it was larger bushings/shaft size......oh well....its heck to get old

Could mean 13" diameter rotors or the HD 1-1/4" wide rotors vs. the 1" light duty rotors.

[88Jimmy4x4]

Ok I have the 1.25 rotors
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[74 stepside]

The arms are the same except 1/2 ton use rubber bushings where 3/4 to 1 tons use greasable style bushings same as 63 to 72 1/2 tons. Ball joints are bigger too.

[Tx Firefighter]

And some of the real heavy duty 1 tons used a different control arm shaft. On my R30, the lower shaft bolts to the crossmember, and not with u-bolts either. The shaft itself has jugs on it that bolt straight to the bottom of the crossmember with nary a Ubolt in sight.

[88Jimmy4x4]

Okay thanks guys
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[6 Door King]

Originally Posted by Tx Firefighter

And some of the real heavy duty 1 tons used a different control arm shaft. On my R30, the lower shaft bolts to the crossmember, and not with u-bolts either. The shaft itself has jugs on it that bolt straight to the bottom of the crossmember with nary a Ubolt in sight.

If I am understanding this correctly, the stamped arm itself is the same for 1/2 ton through 1 ton? And just the bushings and ball joints are different from one to the other? I ask because I have a 90 C30 I want to use tubular arms for my drop, and I can not see any difference in the pictures between the 1/2 and 1 ton versions.

[Tx Firefighter]

I haven't personally confirmed this with my own hands, but its commonly reported here on the board that larger trucks used bigger ball joints, not just the stud, but the body being bigger with a correspondingly bigger hole in the control arm.
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