Body lines cab to bed - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sammywells · 09-27-2020, 06:57 PM

Working on a swb 68 c10 and have a new aftermarket bed which looks nice but. The body line from the door and cab to the bed do not line up. The bed line is 1 inch high and needs to come down to match the other lines. Anyone else run into this on a new bed. Thinking the only way to fix is to notch the cross sill so it will sit at the proper height. Frame is straight and frame mounts to floor measure the same on both sides and truck is level.

The top line needs to be where the bottom is

**truckster** · 09-27-2020, 07:50 PM

How are your cab mount bushings?

sammywells · 09-27-2020, 07:58 PM

Quote:

Originally Posted by truckster

How are your cab mount bushings?

All new
Posted via Mobile Device

**Richard** · 09-28-2020, 12:19 AM

If your mounts are from LMC. That may be part of your problem. Getting good rubber from Classic Heartbeat, GMC Paul's would be recommended. Proper mounts then cab can be shimmed a bit.

sammywells · 09-28-2020, 05:14 AM

I was just wondering if anyone had run into this before and what they did.

**LockDoc** · 09-28-2020, 09:18 AM

-
If your frame is 3/4 ton (C20) and your bushing kit was for a 1/2 ton (C10) it will cause that. The rear bushings on a C20 are taller.

LockDoc

**Richard** · 09-28-2020, 12:36 PM

Quote:

Originally Posted by LockDoc

-
If your frame is 3/4 ton (C20) and your bushing kit was for a 1/2 ton (C10) it will cause that. The rear bushings on a C20 are taller.

LockDoc

Did not even think about that. That being said, while not likely. If the frame was converted to 2wd from a 4x4 frame K10 or K20. Same condition as LockDoc said.

sammywells · 09-28-2020, 02:22 PM

When you say rear bushing do you mean cab bushing.

weq92f · 09-28-2020, 05:04 PM

.
My cab was low like that with the bed sitting directly on the mounts. Wasn't an inch though, maybe a half.

I shimmed the cab up at all four points as well as the core support.

Hth,

-klb

sammywells · 09-28-2020, 06:36 PM

Bushings are for c10. Shimming the cab 1 inch seems like a lot. Only needs 1/2 inch on the other side. There has to be something i'm not seeing yet but i'll figure it out.

**LockDoc** · 09-28-2020, 08:06 PM

Quote:

Originally Posted by sammywells

When you say rear bushing do you mean cab bushing.

Yes, the rear cab bushings.

LockDoc

**Richard** · 09-28-2020, 08:10 PM

I was not just bashing LMC. I have heard of several people having problems with their cab mounts/bushings. If you look at my thread you can see how my cab was sitting at the start of the thread. Were like that since installed new. Almost an inch low. After installing the ones from Classic Heartbeat I had to use the 1/4" rubber isolators on the bed and suck the cab down. You did not say were your rubber was purchased. Just know you cannot go wrong using one of the forum vendors for parts as most of them use the parts they sell.

**LockDoc** · 09-28-2020, 08:12 PM

Quote:

Originally Posted by sammywells

Bushings are for c10. Shimming the cab 1 inch seems like a lot. Only needs 1/2 inch on the other side. There has to be something i'm not seeing yet but i'll figure it out.

Can you take a picture of the rear cab mount brackets and bushings?

It would be a big job to drop the bed down that much. I think your only option is to raise the cab to match the bed.

Just my 2¢ worth....

LockDoc

sammywells · 09-28-2020, 08:25 PM

Quote:

Originally Posted by LockDoc

Can you take a picture of the rear cab mount brackets and bushings?

It would be a big job to drop the bed down that much. I think your only option is to raise the cab to match the bed.

Just my 2¢ worth....

LockDoc

Posted via Mobile Device

sammywells · 09-28-2020, 08:45 PM

Seems like i got the bushing from truckhaven in Tenn. I don't think i'll end up lowering the bed. I think the cab will have to go up. My brother and I are going to take a closer look at the problem tomorrow and i'll let u guys know what we find out.

**LockDoc** · 09-28-2020, 10:17 PM

Quote:

Originally Posted by sammywells

Seems like i got the bushing from truckhaven in Tenn. I don't think i'll end up lowering the bed. I think the cab will have to go up. My brother and I are going to take a closer look at the problem tomorrow and i'll let u guys know what we find out.

OK, sounds good.

LockDoc

gmc684x4 · 09-28-2020, 10:42 PM

Here is a Diagram showing the difference between C10 and C20 and k series mounts

you can see the C20 up and k Series rear Cab mount sits lower on the frame then the C10

**Richard** · 09-29-2020, 01:15 AM

Quote:

Originally Posted by gmc684x4

Here is a Diagram showing the difference between C10 and C20 and k series mounts

you can see the C20 up and k Series rear Cab mount sits lower on the frame then the C10

Where is that image from? It is incorrect in illustrating that the C10 and K10 are the same.

gmc684x4 · 09-29-2020, 02:06 AM

Lol i did not catch that
It is from another cab mount post on this site
Yes c10 mount is different
C20 k10 k20 are same mounts

**special-K** · 09-29-2020, 08:07 AM

Just from the one picture I'm not seeing 1". Looks less to me. Looks like the door is about 1/4" high. I'd say just a bit of tweaking is required, as is normal when assembling a truck. I know of no issues with the reproduction beds lining up as they should

sammywells · 09-29-2020, 07:11 PM

Ok, figured it out. I bought the cab in Tenn. It had already had a new floor put in and other parts. The thought came to me today that maybe when they put the floor in they didn't get it just right. Actually i had to do a lot of re work to the cab but anyway. There was just no way the bed was out that much. So i started to shim the cab. 1 inch on the drivers side and 1/2 on the pass side. When i crawled out from under it the lines where where they needed to be. Still need to do some leveling and squaring but it will be fine.

09-27-2020, 06:57 PM	#1
sammywells Registered User Join Date: Jun 2018 Location: Lucasville,oh Posts: 61	Body lines cab to bed Working on a swb 68 c10 and have a new aftermarket bed which looks nice but. The body line from the door and cab to the bed do not line up. The bed line is 1 inch high and needs to come down to match the other lines. Anyone else run into this on a new bed. Thinking the only way to fix is to notch the cross sill so it will sit at the proper height. Frame is straight and frame mounts to floor measure the same on both sides and truck is level. The top line needs to be where the bottom is Attached Images Last edited by LockDoc; 09-28-2020 at 09:15 AM. Reason: rotated picture

09-27-2020, 07:50 PM	#2
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,976	Re: Body lines cab to bed How are your cab mount bushings? __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson

09-28-2020, 12:19 AM	#4
Richard Senior Member Join Date: Dec 1999 Location: Southern California Posts: 2,881	Re: Body lines cab to bed If your mounts are from LMC. That may be part of your problem. Getting good rubber from Classic Heartbeat, GMC Paul's would be recommended. Proper mounts then cab can be shimmed a bit. __________________ Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746

09-28-2020, 05:14 AM	#5
sammywells Registered User Join Date: Jun 2018 Location: Lucasville,oh Posts: 61	Re: Body lines cab to bed I was just wondering if anyone had run into this before and what they did.

09-28-2020, 09:18 AM	#6
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,771	Re: Body lines cab to bed - If your frame is 3/4 ton (C20) and your bushing kit was for a 1/2 ton (C10) it will cause that. The rear bushings on a C20 are taller. LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

09-28-2020, 02:22 PM	#8
sammywells Registered User Join Date: Jun 2018 Location: Lucasville,oh Posts: 61	Re: Body lines cab to bed When you say rear bushing do you mean cab bushing.

09-28-2020, 05:04 PM	#9
weq92f Registered User Join Date: Oct 2016 Location: Dallas Texas Posts: 3,218	Re: Body lines cab to bed . My cab was low like that with the bed sitting directly on the mounts. Wasn't an inch though, maybe a half. I shimmed the cab up at all four points as well as the core support. Hth, -klb __________________ 67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold

09-28-2020, 06:36 PM	#10
sammywells Registered User Join Date: Jun 2018 Location: Lucasville,oh Posts: 61	Re: Body lines cab to bed Bushings are for c10. Shimming the cab 1 inch seems like a lot. Only needs 1/2 inch on the other side. There has to be something i'm not seeing yet but i'll figure it out.

09-28-2020, 08:10 PM	#12
Richard Senior Member Join Date: Dec 1999 Location: Southern California Posts: 2,881	Re: Body lines cab to bed I was not just bashing LMC. I have heard of several people having problems with their cab mounts/bushings. If you look at my thread you can see how my cab was sitting at the start of the thread. Were like that since installed new. Almost an inch low. After installing the ones from Classic Heartbeat I had to use the 1/4" rubber isolators on the bed and suck the cab down. You did not say were your rubber was purchased. Just know you cannot go wrong using one of the forum vendors for parts as most of them use the parts they sell. __________________ Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746

09-28-2020, 08:45 PM	#15
sammywells Registered User Join Date: Jun 2018 Location: Lucasville,oh Posts: 61	Re: Body lines cab to bed Seems like i got the bushing from truckhaven in Tenn. I don't think i'll end up lowering the bed. I think the cab will have to go up. My brother and I are going to take a closer look at the problem tomorrow and i'll let u guys know what we find out.

09-28-2020, 10:42 PM	#17
gmc684x4 Registered User Join Date: Jul 2012 Location: Whitehorse yukon Posts: 1,218	Re: Body lines cab to bed Here is a Diagram showing the difference between C10 and C20 and k series mounts you can see the C20 up and k Series rear Cab mount sits lower on the frame then the C10 Attached Images

09-29-2020, 02:06 AM	#19
gmc684x4 Registered User Join Date: Jul 2012 Location: Whitehorse yukon Posts: 1,218	Re: Body lines cab to bed Lol i did not catch that It is from another cab mount post on this site Yes c10 mount is different C20 k10 k20 are same mounts

09-29-2020, 08:07 AM	#20
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Body lines cab to bed Just from the one picture I'm not seeing 1". Looks less to me. Looks like the door is about 1/4" high. I'd say just a bit of tweaking is required, as is normal when assembling a truck. I know of no issues with the reproduction beds lining up as they should __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

09-29-2020, 07:11 PM	#21
sammywells Registered User Join Date: Jun 2018 Location: Lucasville,oh Posts: 61	Re: Body lines cab to bed Ok, figured it out. I bought the cab in Tenn. It had already had a new floor put in and other parts. The thought came to me today that maybe when they put the floor in they didn't get it just right. Actually i had to do a lot of re work to the cab but anyway. There was just no way the bed was out that much. So i started to shim the cab. 1 inch on the drivers side and 1/2 on the pass side. When i crawled out from under it the lines where where they needed to be. Still need to do some leveling and squaring but it will be fine. Attached Images



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