Frame Sag

[Jtrux]

Did you put something like these on it??

[mseymour]

yep, they are the polyurethane red mounts, cant remember the name of them, but they also make the stops and bushings for leaf springs etc., yep that was the first thing i checked to make sure they were the right height etc., any ideas to stiffen up the frame/body?

[mseymour]

yep, thats them the energy ones.

[BLUE THUNDER]

If you used the new mounts at the time of your build shimming is the way to go. I wld suggest loosen your body mounts in the area that you are trying to fix and start jacking up the body from the middle of the truck with a 4x4 spanning th rocker boxes til your lines are where you like them and then fill the gaps on the body mounts with shims and you're good to go. Hope that helps. Mario

[AJs72K5]

If you're going to add more shims, or adjust some, I'd recommend loosening all the body mounts on the tub. Otherwise you can cause some binding. It's a very tedious process.

[vtblazer]

Originally Posted by mseymour

put it this way, there is @ a 1.5inch (the amount of spacer) dip in the frame right below the doors, if i put it on the lift or put a jack under the frame, it goes away. the door area is the weak point of the body, as there is no lateral support there

Torsion box & Lower 'A' pillar

Originally Posted by mseymour

I see that they run forward past the doors, but they are in good (solid) shape. what is allowing the sag? again I have to use 1-1.5 inches of spacers in the middle mounts to get the doors to close, other wise the body buckles in the middle

Possibly to much space under the firewall mount

Originally Posted by mseymour

dont have a top, if it was a little more rigid it would be ok, but the flex causes the doors to rub against the bed, rattles and has chipped the paint, I may end up doing some bracing underneath, if i can ever engineer it. I will probably try and find a roll bar for it first and see if I can connect everything

Big project but it does work, it's a band aid though



Everything your describing suggests your body mounts are not correctly adjusted, either not torqued enough, not shimmed enough or could even be torqued to much or shimmed to much.

Also, the torsion boxes ARE what's meant to keep the tub rigid in the door area, that's exactly what their there for, pull the rear cover off and check em out.
How are the lower 'A' pillars looking?
Is there any noticeable rust on the tub?

Keep in mind that these frames are designed to flex, have you compared it to another one to see if there's any differences?

Pics of a "good looking" lower 'A' pillar for ya.
#1 - looks pretty solid
#2 - ...guess not after all.
#3 - Here's the internal support system, it isn't your door openings sagging, it's your firewall moving/flexing here.

[Jtrux]

Originally Posted by AJs72K5

It's a very tedious process.

You're not kidding. No fun at all.

[RED69K5]

I have this same problem with my '72, but I haven't taken it apart yet to investigate the issue. I've read several threads about this issue, and everyone always says shims will fix it. They are probably right, but I don't know for sure. This link to a similar thread might help.

http://coloradok5.com/forums/showthr...Y+MOUNT&page=2

[vtblazer]

Same only different...

[LUV2XCLR8]

Originally Posted by jaros44sr

Hinges are in good shape right?

If they are aftermarket this could be some of the issue, I had this problem.

[mseymour]

anybody know where to get those little striker plates (chrome blocks) at the top of the doors

[bouncytruck]

Repops aren't made. You'll have to start searching for used ones. If you become a subscribing member, you can post a "wanted-to-buy."