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Chassis Sag/flex fix??

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Old 06-11-2012, 04:35 AM   #1
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Chassis Sag/flex fix??

It isn't that bad but it bothers me. When I air up the chassis flex seems a little extreme when looking at the gap between the cab and bed.

I want to know, or get some opinions on, if it would be worth it to box in the c (channel) sections of the frame rails in the rear? Will the frame flex be reduced enough to make the work.. worth it?

I have a feeling it will greatly reduce the chassis sag/flex?



I'm hoping for a Civil Engineer to post some easy to understand formulas or a chart or rule of thumb?
Old 06-11-2012, 04:39 AM   #2
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Re: Chassis Sag/flex fix??

What kind of bag set up do you have
Old 06-11-2012, 05:01 AM   #3
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Re: Chassis Sag/flex fix??

I have the bags on rear bars so the lift is at the far rear of the chassis, that probably is why I have so much flex.

Pics of the setup in my project thread.
Old 06-11-2012, 05:13 AM   #4
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Re: Chassis Sag/flex fix??

Ah I see. Which way is it flexing? When you air up the bed tilts forward?
Old 06-11-2012, 05:51 AM   #5
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Re: Chassis Sag/flex fix??

Ya, the bed tilts forward. When the truck is sitting on the ground or up the tilt isn't bad enough to destroy body lines but when I air up it bounces flexing. I don't notice but would assume that if it will tilt toward the cab that it also twists/rolls the frame when turning.
Old 06-11-2012, 03:05 PM   #6
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Re: Chassis Sag/flex fix??

The s10 frame is quite flexible, and youre right, boxing it in will help quite a bit. In fact, as generations progressed, you see a lot more frame is boxed in the later trucks, but just under the cab. They cant box it past there because of the gas tank mounting.
Old 06-11-2012, 03:12 PM   #7
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Re: Chassis Sag/flex fix??

I boxed mine in aNd it helped a lot also. At the gas tank mounting bracket I boxed in front and behind it
Old 06-11-2012, 03:37 PM   #8
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Re: Chassis Sag/flex fix??

all the trucks i have seen sag/flex while airing up are very poorly done setups(notches not fully welded in and what not).i must have got lucky when i done mine because its got perfect gaps aired up or down.
Old 06-11-2012, 03:45 PM   #9
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Re: Chassis Sag/flex fix??

i saw a thread on here before but i cant find it now. heres a chart i found in another thread it might help
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