ProComp Sucks.

Hey. Just got done replacing the rear end in my truck, and I had to remove the 4" ProComp lift during the process. My biggest complaint with the lift kit (it came with the truck, so I have no idea what model it is) is that with a good lift, the U-bolts should loop around the bottom of the axle, and attach with nuts and a plate over the top of the leaf springs.

The ProComp lift on my hoe has squared u-bolts that loop over the leaves, and attache with a plate under the axle tube with nuts. There's about 2 full inches of extra bolt (maybe for a 6" lift?) hanging down past the nuts. Naturally, the prior owner hit something, and one of the bolts had bent. I cut it off with a hacksaw, and the bolts are not hardened at all, either. Hacksaw cut it like buttuh.

So steer clear from any lift kit that puts the bolt ends and nuts under the axle tube. That's just poor engineering.

It if you have blocks back there, odds are it's for the 6". I've never heard of u-bolt probs with procomp. Good thing I'm going for cepek.

all chevy's are that way. There is a U bolt flip kit you can buy. it is not just Pro-Comp that does that. That is a GM thing

bowtiefreak said:

all chevy's are that way. There is a U bolt flip kit you can buy. it is not just Pro-Comp that does that. That is a GM thing

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was not aware of that

bowtiefreak said:

all chevy's are that way. There is a U bolt flip kit you can buy. it is not just Pro-Comp that does that. That is a GM thing

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exactly.

bigdaddy4x4 said:

It if you have blocks back there, odds are it's for the 6". I've never heard of u-bolt probs with procomp. Good thing I'm going for cepek.

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Like I said, it is a GM thing. I forget who sells the flip kit. Pirate 4x4 mayhave the info.

yep not procomps problem that is GM's design

there are a few kits out there to get rid of the design flaw. i will be ordering one when i get my 14 bolt to drop in, i dont have a technical problem with the current design, rather i like the cleaner look.

yep same thing on my procomp kit other than i don't have the extra since its a 6"

My '77 blazer has a correctly built one. If I'm buying a lift kit, that requires lengthened u-bolts anyway, why not take the extra 2 seconds, and do it right? Also, since we're bashing on procomp, the front IFS kit is shit too. The upper control arm bashes my front shocks every time the suspension goes fully unsprung, even after modivying the bump stops to get some extra height out of them. My brand new RS5000's now each have a dent in them where the control arm has tried to have it's way with them. Boo.

I also beieve that this is a GM problem. Sucks huh? smaller diameter shock bodies. I have read a few posts over at FSC about this. I do not remember the exact cause. Doesn't happen to mine though. BUT my tires just rub the shock when I am turning and hit a big dip. That is also how I noticed I needed to "trim" the back side of my fender. The tire caught and crushed it a little. Got a saw and took out an inch or so, problem solved.

ravingmadman said:

My '77 blazer has a correctly built one. If I'm buying a lift kit, that requires lengthened u-bolts anyway, why not take the extra 2 seconds, and do it right? Also, since we're bashing on procomp, the front IFS kit is shit too. The upper control arm bashes my front shocks every time the suspension goes fully unsprung, even after modivying the bump stops to get some extra height out of them. My brand new RS5000's now each have a dent in them where the control arm has tried to have it's way with them. Boo.

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yep, yet again GM issue. mine do the same thing as well, and i also did it to my rs 9000 xl shocks the day i put them in, which considering the price it was extremly annoying. get some shock hoops, or different shock positioning to take care of it. they also make shock relocation brackets which slides the shock in about 1.5 inches or somthin close to that

bowtiefreak said:

Like I said, it is a GM thing. I forget who sells the flip kit. Pirate 4x4 mayhave the info.

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Cool thx for info. Haven't logged on pirate in awhile so this will be a good excuse.