I need help mounting bed cross sills... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Dark Knight · 03-22-2010, 10:48 PM

I've tried the search, but couldn't find what I was looking for. As usual. I need help installing the cross sills on a fleetside LWB truck with a wood bed floor. I have 5 cross sills, 4 of them are mounted, but I can't remember where the 5th one goes. I have 3 in the front, and 1 directly under the rear of the wheelhouses. A picture would be really helpful. Thanks.

OhioDan · 03-23-2010, 01:50 AM

There should be mounting pads /brackets on the frame where the cross sills are supposed to go? Here's how and where mine are mounted.
The first three behind the cab.

OhioDan · 03-23-2010, 01:52 AM

And the last 2 go here. Sorry, no dimensions. Hope this helps?

OhioDan · 03-23-2010, 01:55 AM

I have 2 small cross sills also. One goes all the way across just before the wheel tubs, and the other, shorter, goes across between the tubs.

Dark Knight · 03-23-2010, 11:13 PM

Your second picture answered my question. The one closest to the tailgate was the one that left me scratching my head. It's been so long since it was together that I forgot how it all went back. Thanks a million!

03-22-2010, 10:48 PM	#1
Dark Knight Registered User Join Date: Dec 2008 Location: Pleak, Texas Posts: 420	I need help mounting bed cross sills... I've tried the search, but couldn't find what I was looking for. As usual. I need help installing the cross sills on a fleetside LWB truck with a wood bed floor. I have 5 cross sills, 4 of them are mounted, but I can't remember where the 5th one goes. I have 3 in the front, and 1 directly under the rear of the wheelhouses. A picture would be really helpful. Thanks. __________________ -1967 Chevrolet Fleetside LWB- 350 V8 w/thumpr cam, NV3500, 3.08 gears, A/C, PS -1983 Chevy Silverado C1500- 383 stroker, TH400 -1989 Chevy Silverado K1500 SWB- 5.3L swap, 700R4, 3.42 gears -And a '66 Ford Mustang- 200 I6, C4 trans, rust bucket "The only thing we have to fear is fear itself." -FDR (and maybe rust too) You've gotta be able to stop and steer before you can go fast!

03-23-2010, 01:50 AM	#2
OhioDan Registered User Join Date: Apr 2002 Location: New Carlisle, Ohio,USA Posts: 1,404	Re: I need help mounting bed cross sills... There should be mounting pads /brackets on the frame where the cross sills are supposed to go? Here's how and where mine are mounted. The first three behind the cab. Attached Images __________________ LIFE AIN'T EASY WHEN YER FAT AND GREASY! GMC= Got More Class! 1970 GMC LWB, Fleetside, 350/4spd, Flowmaster "40's", 2002 GMC 16" Rallies, cowl hood,and added a bunch of options that weren't there when I started.

03-23-2010, 01:52 AM	#3
OhioDan Registered User Join Date: Apr 2002 Location: New Carlisle, Ohio,USA Posts: 1,404	Re: I need help mounting bed cross sills... And the last 2 go here. Sorry, no dimensions. Hope this helps? Attached Images __________________ LIFE AIN'T EASY WHEN YER FAT AND GREASY! GMC= Got More Class! 1970 GMC LWB, Fleetside, 350/4spd, Flowmaster "40's", 2002 GMC 16" Rallies, cowl hood,and added a bunch of options that weren't there when I started.

03-23-2010, 01:55 AM	#4
OhioDan Registered User Join Date: Apr 2002 Location: New Carlisle, Ohio,USA Posts: 1,404	Re: I need help mounting bed cross sills... I have 2 small cross sills also. One goes all the way across just before the wheel tubs, and the other, shorter, goes across between the tubs. __________________ LIFE AIN'T EASY WHEN YER FAT AND GREASY! GMC= Got More Class! 1970 GMC LWB, Fleetside, 350/4spd, Flowmaster "40's", 2002 GMC 16" Rallies, cowl hood,and added a bunch of options that weren't there when I started. Last edited by OhioDan; 03-23-2010 at 01:56 AM.

03-23-2010, 11:13 PM	#5
Dark Knight Registered User Join Date: Dec 2008 Location: Pleak, Texas Posts: 420	Re: I need help mounting bed cross sills... Your second picture answered my question. The one closest to the tailgate was the one that left me scratching my head. It's been so long since it was together that I forgot how it all went back. Thanks a million! __________________ -1967 Chevrolet Fleetside LWB- 350 V8 w/thumpr cam, NV3500, 3.08 gears, A/C, PS -1983 Chevy Silverado C1500- 383 stroker, TH400 -1989 Chevy Silverado K1500 SWB- 5.3L swap, 700R4, 3.42 gears -And a '66 Ford Mustang- 200 I6, C4 trans, rust bucket "The only thing we have to fear is fear itself." -FDR (and maybe rust too) You've gotta be able to stop and steer before you can go fast!

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