what is this? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crossfire84 · 04-26-2013, 04:14 PM

I could use some help here, what is this box on the last support of the AD box? One on each side and what are they for? Thanks.

S10Fan · 04-26-2013, 04:49 PM

Frame mount.

crossfire84 · 04-26-2013, 05:18 PM

Quote:

Originally Posted by S10Fan

Frame mount.

My frame is nowhere there that thing.

Bubba54 · 04-26-2013, 05:22 PM

Yep, it mounts the bed to the frame. When installing the bed wood, there will be a board thats right over each one of the boxes and a bolt go through to the frame. Good luck with the install.

crossfire84 · 04-26-2013, 06:27 PM

Quote:

Originally Posted by Bubba54

Yep, it mounts the bed to the frame. When installing the bed wood, there will be a board thats right over each one of the boxes and a bolt go through to the frame. Good luck with the install.

The frame does not go under these. there about 6" away.

Bubba54 · 04-26-2013, 06:47 PM

I know there are different rear sills for different years. There is also a difference between 1/2 and 3/4 ton sills. Is your truck a 3/4 ton ?

S10Fan · 04-26-2013, 07:05 PM

In this picture from LMC you can see the sill boxes and pads as they mount to the bed. Contact the seller and let them know the issue. I have 2 stepsides, both mount to the frame via the boxes on the cross sill.

crossfire84 · 04-26-2013, 07:25 PM

Quote:

Originally Posted by S10Fan

In this picture from LMC you can see the sill boxes and pads as they mount to the bed. Contact the seller and let them know the issue. I have 2 stepsides, both mount to the frame via the boxes on the cross sill.

so i could cut these off and weld them on just above the frame, sounds do-able.

Quote:

Originally Posted by Bubba54

I know there are different rear sills for different years. There is also a difference between 1/2 and 3/4 ton sills. Is your truck a 3/4 ton ?

the frame is a 3600, the box is for a 3100

thanks for the info everyone.

**G&R's57GMC** · 04-26-2013, 07:28 PM

What year is your AD ?

The '47-'53 AD's have a splayed (wider at the rear) Chassis.

The '54-'59 AD & TF use a parallel Chassis.

If you bed is centered over the Chassis then I'd say you have a Parallel Chassis.

crossfire84 · 04-26-2013, 07:31 PM

Quote:

Originally Posted by G&R's57GMC

What year is your AD ?

The '47-'53 AD's have a splayed (wider at the rear) Chassis.

The '54-'59 AD & TF use a parallel Chassis.

If you bed is centered over the Chassis then I'd say you have a Parallel Chassis.

the title says 50 but the frame is parallel.

**G&R's57GMC** · 04-26-2013, 07:40 PM

AS I was posting You posted that its a 3600. That would make it parallel and a early Chassis.

My Post was assuming a 1/2 ton chassis.

Bubba54 · 04-26-2013, 07:41 PM

If the bed fits otherwise, i dont think there would be a problem relocating the mounts.

**G&R's57GMC** · 04-26-2013, 07:47 PM

Just for grins decode your chassis number in the LMC catalog VIN ID section.

That will help you with IDing just what you have. A lot can happen in 60 years to these old trucks.

crossfire84 · 04-26-2013, 07:51 PM

Quote:

Originally Posted by G&R's57GMC

Just for grins decode your chassis number in the LMC catalog VIN ID section.

That will help you with IDing just what you have. A lot can happen in 60 years to these old trucks.

good idea, thanks.

mknittle · 04-26-2013, 10:48 PM

I just looked at a 1/2 and3/4 ton sills your frame looks to be 3/4 ton and your sill is 1/2ton 47-53. I would just move the mounts like you said. the sills are the same other than that.

crossfire84 · 04-27-2013, 09:34 AM

Quote:

Originally Posted by mknittle

I just looked at a 1/2 and3/4 ton sills your frame looks to be 3/4 ton and your sill is 1/2ton 47-53. I would just move the mounts like you said. the sills are the same other than that.

thanks, will do.

crossfire84 · 05-11-2013, 01:59 PM

Problem solved, made new mounts.

Bubba54 · 05-12-2013, 08:54 AM

Looks good. Nice way to hide the mounting bolts.

crossfire84 · 05-12-2013, 09:29 AM

Quote:

Originally Posted by Bubba54

Looks good. Nice way to hide the mounting bolts.

thanks.

S10Fan · 05-12-2013, 10:47 AM

Quote:

Originally Posted by crossfire84

Problem solved, made new mounts.

Looks Great!

crossfire84 · 05-13-2013, 07:31 PM

Quote:

Originally Posted by S10Fan

Looks Great!

thanks.

04-26-2013, 04:14 PM	#1
crossfire84 Registered User Join Date: Jun 2012 Location: wind lake WI Posts: 1,747	what is this? I could use some help here, what is this box on the last support of the AD box? One on each side and what are they for? Thanks. Attached Images __________________ LIL ERV the 50-3600 396 BBC stroked to 415 cid Richmond 6spd over drive C4 rear Porter built a arms Never give the Devil a ride,because he'll want to Drive!

04-26-2013, 04:49 PM	#2
S10Fan Old Heap Driver Join Date: Mar 2008 Location: Newport News, Va Posts: 2,640	Re: what is this? Frame mount. __________________ _____________________________ Bryan '99 Silverado 1500, 4.3, 5-speed, reg cab, short bed '50 Chevy 2DR Hard Top, 350/350, M2 Front End, 3:08 gear, cruiser. '40 F**d Sedan, all Chevy power, Heidt's front end, TCI rear, nice driver.

04-26-2013, 05:22 PM	#4
Bubba54 Registered User Join Date: Apr 2013 Location: St. Peters, Missouri Posts: 155	Re: what is this? Yep, it mounts the bed to the frame. When installing the bed wood, there will be a board thats right over each one of the boxes and a bolt go through to the frame. Good luck with the install.

04-26-2013, 06:47 PM	#6
Bubba54 Registered User Join Date: Apr 2013 Location: St. Peters, Missouri Posts: 155	Re: what is this? I know there are different rear sills for different years. There is also a difference between 1/2 and 3/4 ton sills. Is your truck a 3/4 ton ?

04-26-2013, 07:05 PM	#7
S10Fan Old Heap Driver Join Date: Mar 2008 Location: Newport News, Va Posts: 2,640	Re: what is this? In this picture from LMC you can see the sill boxes and pads as they mount to the bed. Contact the seller and let them know the issue. I have 2 stepsides, both mount to the frame via the boxes on the cross sill. Attached Images __________________ _____________________________ Bryan '99 Silverado 1500, 4.3, 5-speed, reg cab, short bed '50 Chevy 2DR Hard Top, 350/350, M2 Front End, 3:08 gear, cruiser. '40 F**d Sedan, all Chevy power, Heidt's front end, TCI rear, nice driver.

04-26-2013, 07:28 PM	#9
G&R's57GMC Senior Member Join Date: Aug 2010 Location: Shasta Lake, CA. Posts: 1,619	Re: what is this? What year is your AD ? The '47-'53 AD's have a splayed (wider at the rear) Chassis. The '54-'59 AD & TF use a parallel Chassis. If you bed is centered over the Chassis then I'd say you have a Parallel Chassis. __________________ Glen & Jane's Rides ‘57 GMC NAPCO Long Bed V8 4 speed Bought 2008 7 other cars & trucks , 5 trailers '56 Chevy Long Bed I6, 4 speed Bought 1990 Sold 8.22.2020 ’56 GMC Suburban Pickup V8, 4 speed Hydramatic Bought 1996 Sold 10.11.2020 My Other Tinkerings http://67-72chevytrucks.com/vboard/s...75#post8967275

04-26-2013, 07:40 PM	#11
G&R's57GMC Senior Member Join Date: Aug 2010 Location: Shasta Lake, CA. Posts: 1,619	Re: what is this? AS I was posting You posted that its a 3600. That would make it parallel and a early Chassis. My Post was assuming a 1/2 ton chassis. __________________ Glen & Jane's Rides ‘57 GMC NAPCO Long Bed V8 4 speed Bought 2008 7 other cars & trucks , 5 trailers '56 Chevy Long Bed I6, 4 speed Bought 1990 Sold 8.22.2020 ’56 GMC Suburban Pickup V8, 4 speed Hydramatic Bought 1996 Sold 10.11.2020 My Other Tinkerings http://67-72chevytrucks.com/vboard/s...75#post8967275

04-26-2013, 07:41 PM	#12
Bubba54 Registered User Join Date: Apr 2013 Location: St. Peters, Missouri Posts: 155	Re: what is this? If the bed fits otherwise, i dont think there would be a problem relocating the mounts.

04-26-2013, 07:47 PM	#13
G&R's57GMC Senior Member Join Date: Aug 2010 Location: Shasta Lake, CA. Posts: 1,619	Re: what is this? Just for grins decode your chassis number in the LMC catalog VIN ID section. That will help you with IDing just what you have. A lot can happen in 60 years to these old trucks. __________________ Glen & Jane's Rides ‘57 GMC NAPCO Long Bed V8 4 speed Bought 2008 7 other cars & trucks , 5 trailers '56 Chevy Long Bed I6, 4 speed Bought 1990 Sold 8.22.2020 ’56 GMC Suburban Pickup V8, 4 speed Hydramatic Bought 1996 Sold 10.11.2020 My Other Tinkerings http://67-72chevytrucks.com/vboard/s...75#post8967275

04-26-2013, 10:48 PM	#15
mknittle Registered User Join Date: Jul 2011 Location: Auburn ca. Posts: 2,886	Re: what is this? I just looked at a 1/2 and3/4 ton sills your frame looks to be 3/4 ton and your sill is 1/2ton 47-53. I would just move the mounts like you said. the sills are the same other than that. __________________ Mark My GMC build. http://67-72chevytrucks.com/vboard/s...d.php?t=536602

05-11-2013, 01:59 PM	#17
crossfire84 Registered User Join Date: Jun 2012 Location: wind lake WI Posts: 1,747	Re: what is this? Problem solved, made new mounts. Attached Images __________________ LIL ERV the 50-3600 396 BBC stroked to 415 cid Richmond 6spd over drive C4 rear Porter built a arms Never give the Devil a ride,because he'll want to Drive!

05-12-2013, 08:54 AM	#18
Bubba54 Registered User Join Date: Apr 2013 Location: St. Peters, Missouri Posts: 155	Re: what is this? Looks good. Nice way to hide the mounting bolts.



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