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Re: Frame straight enough? 1950 3100 [Re: 49shep] #1303113
Fri Mar 15 2019 04:03 AM
Fri Mar 15 2019 04:03 AM
F
FootStomper  Offline
Shop Shark
Joined: Oct 2015
Posts: 317
Alberta, Canada
The front and rear springs can affect the way the frame sits at rest. My 59 had a high rear passenger side, until the spring shop re-arced the front driver's side spring... then the entire truck sat perfectly level! Turns out that that spring set was pulling down...enough to lift the opposite corner. Hopefully my experience can help yours.


~~ Darcy

1959 GMC 9310 Canadian- built Shortbox Fleetside Deluxe
FootStomper
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Re: Frame straight enough? 1950 3100 [Re: 49shep] #1303114
Fri Mar 15 2019 04:06 AM
Fri Mar 15 2019 04:06 AM
MNSmith  Offline
"Hey! I sound like Darth Vader!!
Joined: Oct 2005
Posts: 2,535
So Cal
For the most part, the frame is flat from the radiator cross member to the rear end kick up. Especially on top of the rails. If there is any way you can site down the rail, you'll be able to see if there are any bows or twists in your rails.

Similar to sighting lumber. If you have never done that, this guy explains it a little better than me. https://youtu.be/PRRa86DlYBc

Re: Frame straight enough? 1950 3100 [Re: 49shep] #1303118
Fri Mar 15 2019 04:57 AM
Fri Mar 15 2019 04:57 AM
4
49shep  Offline OP
Wrench Fetcher
Joined: Feb 2018
Posts: 52
Camarillo, California, califor...
The cab is still on the truck so it may be hard to sight the rail but I’ll give it a shot. I wonder what cause such a thing. Maybe to heavy a load in the bed at some point. I understand what frontstomper is saying, I plan on replacing the springs or going with IFS so I guess I’ll see if anything changes when I remove them. Thanks all

Re: Frame straight enough? 1950 3100 [Re: 49shep] #1303174
Fri Mar 15 2019 06:54 PM
Fri Mar 15 2019 06:54 PM
B
bartamos  Offline
Master Gabster
Joined: May 2005
Posts: 5,791
State48 Ranch
Eye sighting may be very hard to do, and see, in the 1/8-1/4 range. There may be humps, rivets, metal overlap and all manor of features to interrupt sight, unlike a board. Getting your eye down there (with a level head wink ) is harder than standing and holding a board.

This point has been made by other posters already but here are my thoughts. 1/8 is in the area of level, on a truck that old. You may be thinking there is a "problem" that does not exists. The frame build tolerances, together with metal and rivet fatigue/stretch, would give 1/8 across 34" easily. How are you arriving at the 1/8-1/4 dimension? How are you measuring that? There could be some error with how you do it.

By the time you add the thickness tolerance stack, the fatigue and shrinkage of the hardware/pads that make up cab mounting, you could even be 1/8-1/4 in the opposite direction, regarding your results in checking cab for level. Your numbers, 1/8-1/4 are not abnormal even if you are exact. So my answer is no, you do not have a problem to worry about.

I have a laser level on a tripod that puts out a horizontal and vertical red line after the tripod is bubble leveled. I use that for all kinds of things around the house. This would be a good thing to use in your case if you want to be sure. The sagging springs is a good point. That has to be checked and/or taken out of the equation. (this is the point Mark made about putting frame on leveled jack stands)
A 20% coupon available in many fliers and magazines, makes this $44.
https://www.harborfreight.com/self-leveling-laser-level-kit-69243.html


1960 GMC K1001 (The Oreo SpeedWagon)
To each his own or the Highway.
All I know is what the voices in my head tell me and a little from watching TV.



Re: Frame straight enough? 1950 3100 [Re: 49shep] #1303184
Fri Mar 15 2019 08:15 PM
Fri Mar 15 2019 08:15 PM
4
49shep  Offline OP
Wrench Fetcher
Joined: Feb 2018
Posts: 52
Camarillo, California, califor...
Thank you. That’s what I was hoping to hear. It sounds like most people on here wouldn’t worry about that small of a difference. After I get it back from the sandblaster I will take a real close look at that rail and just make sure there are no cracks or weird things. Other than that I won’t spend much more time on it. Thanks for all the input.

Re: Frame straight enough? 1950 3100 [Re: 49shep] #1303222
Sat Mar 16 2019 12:30 AM
Sat Mar 16 2019 12:30 AM
5
52Carl  Offline
Master Gabster
Joined: Mar 2010
Posts: 7,783
Virginia
I would say that 1/8th to 1/4" would fall under the category of margin of error for manufacture and/or measuring method.

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