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 > Compensating for GM crowned bed

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dhull

Some Lake Some where

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Posted: 04/07/21 05:53pm Link  |  Quote  |  Print  |  Notify Moderator

I didn't discover this anomaly until about a year in when I noticed denting occurring in the front of the bed and on the camper where it meets the end of the bed. A result from the rocking motion from the built in see saw. Also noticed the distance from the bed rails to the camper was not uniform from front to back. Gap was less at rear.

[image]


[image]


So I made a wedge using 3 pieces of 3/16" wood sheets glued together. So its 9/16" on thick end and 3/16" at the thin end. Its 50" wide and 21" long. Then I slip that under the rear of my Dee Zee bed mat.

[image]

As you can see the mat leaves rubber on the wedge but little on the thin end leading me to think its too thick at 9/16" or too long.

So I wanna make another using 24" x 30" trucker mud flaps which will need trimmed.
MY QUESTIONS....
About how much drop is there on a 2016 Chevy short bed from the crown to the end of the bed?
Can I ignore putting anything on the other side of the crown?

Grit dog

Black Diamond, WA

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Posted: 04/07/21 06:57pm Link  |  Quote  |  Print  |  Notify Moderator

Why wouldn't you just use a straight edge and measure it?


2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29

Geo*Boy

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Posted: 04/08/21 06:21am Link  |  Quote  |  Print  |  Notify Moderator

I first placed a 1&13/16” thick x 6” high piece of lumber across the front of the bed with a a 3/4” thick piece of HDPE attach to the lumber to keep the TC off of the front of the truck bed. I have a rubber bed mat in the bed, then I placed a piece 1/2” thick horse stall mat on the rear of the truck bed to compensate for the crown. I placed a straight edge, front to back, to find where the crown started to tapered to determine where to place the shim.

* This post was edited 04/08/21 02:15pm by Geo*Boy *

MORSNOW

Mountain Home, ID

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Posted: 04/08/21 09:09am Link  |  Quote  |  Print  |  Notify Moderator

There is a center crown in the box around the axle area to allow water drainage front and rear, it is obvious when I ran a 4' level lengthwise in the box. I put two rubber semi mud flaps side by side in the back half under my rubber camper mat, problem solved.


2014 Wolf Creek 850SB
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dhull

Some Lake Some where

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Posted: 04/08/21 10:27am Link  |  Quote  |  Print  |  Notify Moderator

MORSNOW wrote:

There is a center crown in the box around the axle area to allow water drainage front and rear, it is obvious when I ran a 4' level lengthwise in the box. I put two rubber semi mud flaps side by side in the back half under my rubber camper mat, problem solved.


Didn't you trim some off the length of your mats?

Z-Peller

Oceanside BC

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Posted: 04/09/21 01:22am Link  |  Quote  |  Print  |  Notify Moderator

My 2016 GMC long box is 7/16" drop at tailgate when straight edge is run from front of the box.
I need lift for my camper and use two 4'x8' 3/4" sheets of plywood. I shim those with a 1/2" x12" plywood piece across width of box at tailgate.
[image]


Bill..
2017 Bigfoot 10.4 camper...2016 GMC 3500 4x4 Xcab Duramax Dually...

Bert the Welder

Van. Island

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Posted: 04/09/21 08:19am Link  |  Quote  |  Print  |  Notify Moderator

Z-Peller wrote:

when straight edge is run from front of the box.


....Shows pic of a Canadian 2x4...... a Newfie Straight edge [emoticon]


"> 1998 GMC 2500, 10.5 Okanagan, My better/smarter half, George and Finnegan(APBT), all I need.


MORSNOW

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Posted: 04/09/21 09:13am Link  |  Quote  |  Print  |  Notify Moderator

dhull wrote:

Didn't you trim some off the length of your mats?


No, you can buy semi mud flaps in different lengths, I think mine are 24".

Z-Peller

Oceanside BC

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Posted: 04/09/21 02:33pm Link  |  Quote  |  Print  |  Notify Moderator

Quote:

....Shows pic of a Canadian 2x4...... a Newfie Straight edge




Nope, not a H depot airplane propeller...this one eyeballed carefully before using and was straight...my 4 foot level was 4 feet too short for this job.[emoticon]

dhull

Some Lake Some where

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Posted: 04/09/21 07:50pm Link  |  Quote  |  Print  |  Notify Moderator

Z-Peller wrote:

Quote:

....Shows pic of a Canadian 2x4...... a Newfie Straight edge




Nope, not a H depot airplane propeller...this one eyeballed carefully before using and was straight...my 4 foot level was 4 feet too short for this job.[emoticon]


Thats funny! I couldn't use my 4 foot level either even on my short bed truck.

I haven't seen a 2x4 that straight for 30 years!

I got plan now, will post pics...

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