How many cross sills for a fleetside wood floor? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

glock35ipsc · 04-20-2007, 06:20 PM

There is the obvious one in the far rear of the bed, but how many other cross sills are required for a short fleet wood floor? And since there are two different heigths, how many of each of those? Anyone have a pic of their floor showing all of the cross sills?

TIA!
Bob

72chevy327 · 04-20-2007, 07:26 PM

I am pretty sure its 3 of the long ones (2 fount and 1 rear + rear sill) and 1 short one, pleas correct me if i am wrong.

19673ontree · 04-20-2007, 07:36 PM

starting at the rear you have the main cross brace , then you have a large cross sill then the shorter cross sill the two more large ones , a total of 4 sill's 3 large 1 small and the main rear crossmember , from memory but I think thats correct

glock35ipsc · 04-21-2007, 01:32 AM

Cool, thanks guys!

stevess11 · 04-21-2007, 03:06 AM

You need four. The big one in the rear and the three that support the wood. There is a opional reinforcing strip that is recomended if your going to haul heavy items.

RustyParts · 04-21-2007, 08:42 AM

If your going from steel to wood isn't the front header also required? Aren't the sills also turned upside down?

If youv'e already got a wood bed you already know this so don't pay any attention to me.LOL

**special-K** · 04-21-2007, 08:50 AM

Quote:

Originally Posted by RustyParts

If your going from steel to wood isn't the front header also required? Aren't the sills also turned upside down?

If youv'e already got a wood bed you already know this so don't pay any attention to me.LOL

Yes,Yes,and I`m not

.

RustyParts · 04-21-2007, 08:51 AM

Thank you, I hate makin' an arse of myself.

msgross · 04-21-2007, 09:06 AM

I have already cut my rear sill out in this pic (large one) My reinforcement strip in front of wheel wells is rotted and the PO added that large steel plate over the axle for extra reinforcement...

1,2,3 same cross sill bolt to frame
RS - reinforcement strip -long and doesn't bolt to frame
rear main cross sill - holds back of bed and wiring harnass

I called MAR-K because their examples are a little confusing. I think that you could add the short reinforcement strip just behind the wheel wells? Since mine has a 1/4" piece of steel added then I only purchased the long stip from them. The front panel is different than a steel floor as well.

Hope this works...
Mike

glock35ipsc · 04-21-2007, 10:45 AM

RustyParts, I'll just ignore ya then!

Thanks for that picture Mike! It's an all new bed, meant for a wood floor. I've never seen a good pic or had a good description of where they go. Since I doubt I will ever haul anything heavier than a cooler, so I don't guess I will need all the extra strips. I will need to notch the rear sill (not the main one) to clear the Blazer tank.

Thanks agagin guys!

powell72 · 04-21-2007, 03:36 PM

BTW Bob, along as we're talking beds, the bed on the wife's truck is 3/4'' from the cab now that it's secured. I forgot you asked awhile back.

msgross · 04-21-2007, 05:48 PM

I have to notch #3 as well due to a Blazer tank install. Hope that it helped, I can search for more if need be. I would guess that mine was all original since nothing was salvageable!

Luckily I found a complete set of all 4 sills and strips at Carlisle last year for $120.

**special-K** · 04-21-2007, 08:28 PM

This is good info.The almighty LMC reference bible just lists A/R(as required).Real helpful.I guess your s`posed to ask their operators...yeah right.They must want you to over order to move move volumn or under order so they can make more off shipping

.

glock35ipsc · 04-23-2007, 10:05 AM

Thanks Chris!

OK, sounds like I am good to go then. I think I will look into using one of the thinner ones over the gas tank, then make some mounts to fill the gap between the thinner sill and the frame. I have the thinner one over the gas tank right now, tied together between the back side of the wheel tubs, and it clears the tank.

msgross · 04-23-2007, 10:48 AM

good idea on the thinner one, I might look into that...

**GMCPaul** · 04-23-2007, 05:01 PM

Short wheelbase trucks need the following to replace all original stock pieces
3- Cross Sills
1- 49.5" reinforcement Strip 1"high
1- 72" reinforcement Strip 1"high
1- Rear Cross Sill
Long wheelbase trucks need the following to replace all original stock pieces
5- Cross Sills
1- 49.5" reinforcement Strip 1"high
1- 72" reinforcement Strip 1"high
1- Rear Cross Sill
GMCPaul

glock35ipsc · 04-23-2007, 05:21 PM

Thanks, GMCPaul. Do you know the location of the two reinforcing strips?

**GMCPaul** · 04-23-2007, 06:25 PM

72" at leading edge of wheel tubs and the 49.5"is about 1/2way maybe 2/3rds the way from back of rear wheel tubs.
GMCPauls

glock35ipsc · 04-23-2007, 07:34 PM

Thank you very much!

msgross · 04-23-2007, 11:19 PM

looks like mine was missing the short strip but it had the steel plate installed by the PO to help...

04-20-2007, 06:20 PM	#1
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,685	How many cross sills for a fleetside wood floor? There is the obvious one in the far rear of the bed, but how many other cross sills are required for a short fleet wood floor? And since there are two different heigths, how many of each of those? Anyone have a pic of their floor showing all of the cross sills? TIA! Bob __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

04-20-2007, 07:26 PM	#2
72chevy327 Registered User Join Date: Apr 2006 Location: edmonton ab ca Posts: 88	Re: How many cross sills for a fleetside wood floor? I am pretty sure its 3 of the long ones (2 fount and 1 rear + rear sill) and 1 short one, pleas correct me if i am wrong.

04-21-2007, 01:32 AM	#4
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,685	Re: How many cross sills for a fleetside wood floor? Cool, thanks guys! __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

04-21-2007, 03:06 AM	#5
stevess11 Registered User Join Date: Aug 2004 Location: sedalia mo Posts: 77	Re: How many cross sills for a fleetside wood floor? You need four. The big one in the rear and the three that support the wood. There is a opional reinforcing strip that is recomended if your going to haul heavy items.

04-21-2007, 08:42 AM	#6
RustyParts Registered User Join Date: May 2006 Location: Wyman, Kentucky Posts: 403	Re: How many cross sills for a fleetside wood floor? If your going from steel to wood isn't the front header also required? Aren't the sills also turned upside down? If youv'e already got a wood bed you already know this so don't pay any attention to me.LOL __________________ 1972 GMC Jimmy, 4WD, 454 CI, 350 Turbo, 4" lift, 35" tires The math teacher said my son "Bubba" could be a mathmatical genius. cause he's got 13 fingers!

04-20-2007, 07:36 PM	#3
19673ontree CAN'T FIX NOTHIN Join Date: Sep 2006 Location: SOUTHRUST VIRGINIA !!! Posts: 2,112	Re: How many cross sills for a fleetside wood floor? starting at the rear you have the main cross brace , then you have a large cross sill then the shorter cross sill the two more large ones , a total of 4 sill's 3 large 1 small and the main rear crossmember , from memory but I think thats correct __________________ 1967 C10 Shortbed Fleetside Small back glass 6 cyl 3spd on the tree 3.08 gears underdash AC

04-21-2007, 08:51 AM	#8
RustyParts Registered User Join Date: May 2006 Location: Wyman, Kentucky Posts: 403	Re: How many cross sills for a fleetside wood floor? Thank you, I hate makin' an arse of myself. __________________ 1972 GMC Jimmy, 4WD, 454 CI, 350 Turbo, 4" lift, 35" tires The math teacher said my son "Bubba" could be a mathmatical genius. cause he's got 13 fingers!

04-21-2007, 09:06 AM	#9
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: How many cross sills for a fleetside wood floor? I have already cut my rear sill out in this pic (large one) My reinforcement strip in front of wheel wells is rotted and the PO added that large steel plate over the axle for extra reinforcement... 1,2,3 same cross sill bolt to frame RS - reinforcement strip -long and doesn't bolt to frame rear main cross sill - holds back of bed and wiring harnass I called MAR-K because their examples are a little confusing. I think that you could add the short reinforcement strip just behind the wheel wells? Since mine has a 1/4" piece of steel added then I only purchased the long stip from them. The front panel is different than a steel floor as well. Hope this works... Mike Attached Images __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer" Last edited by msgross; 04-21-2007 at 10:08 PM. Reason: TYPO

04-21-2007, 10:45 AM	#10
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,685	Re: How many cross sills for a fleetside wood floor? RustyParts, I'll just ignore ya then! Thanks for that picture Mike! It's an all new bed, meant for a wood floor. I've never seen a good pic or had a good description of where they go. Since I doubt I will ever haul anything heavier than a cooler, so I don't guess I will need all the extra strips. I will need to notch the rear sill (not the main one) to clear the Blazer tank. Thanks agagin guys! __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

04-21-2007, 03:36 PM	#11
powell72 Senior Member Join Date: Jan 2005 Location: Loveland Co. Posts: 3,098	Re: How many cross sills for a fleetside wood floor? BTW Bob, along as we're talking beds, the bed on the wife's truck is 3/4'' from the cab now that it's secured. I forgot you asked awhile back. __________________ Chris 74 Custom Deluxe SWB 350/350/3.73’s 99 2wd Silverado RCSB 5.3/4L60/3.90’s http://www.classictrucks.com/feature...short_bed.html

04-21-2007, 05:48 PM	#12
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: How many cross sills for a fleetside wood floor? I have to notch #3 as well due to a Blazer tank install. Hope that it helped, I can search for more if need be. I would guess that mine was all original since nothing was salvageable! Luckily I found a complete set of all 4 sills and strips at Carlisle last year for $120. __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

04-21-2007, 08:28 PM	#13
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: How many cross sills for a fleetside wood floor? This is good info.The almighty LMC reference bible just lists A/R(as required).Real helpful.I guess your s`posed to ask their operators...yeah right.They must want you to over order to move move volumn or under order so they can make more off shipping. __________________ "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 ~

04-23-2007, 10:05 AM	#14
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,685	Re: How many cross sills for a fleetside wood floor? Thanks Chris! OK, sounds like I am good to go then. I think I will look into using one of the thinner ones over the gas tank, then make some mounts to fill the gap between the thinner sill and the frame. I have the thinner one over the gas tank right now, tied together between the back side of the wheel tubs, and it clears the tank. __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

04-23-2007, 10:48 AM	#15
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: How many cross sills for a fleetside wood floor? good idea on the thinner one, I might look into that... __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

04-23-2007, 05:01 PM	#16
GMCPaul Senior Member Join Date: Mar 2000 Location: Rockville,In. USA Posts: 3,721	Re: How many cross sills for a fleetside wood floor? Short wheelbase trucks need the following to replace all original stock pieces 3- Cross Sills 1- 49.5" reinforcement Strip 1"high 1- 72" reinforcement Strip 1"high 1- Rear Cross Sill Long wheelbase trucks need the following to replace all original stock pieces 5- Cross Sills 1- 49.5" reinforcement Strip 1"high 1- 72" reinforcement Strip 1"high 1- Rear Cross Sill GMCPaul __________________ Secure Online Catalog for-GMCPauls Truck Parts Email- GMCPAULS@GMAIL.COM



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04-23-2007, 05:21 PM	#17
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,685	Re: How many cross sills for a fleetside wood floor? Thanks, GMCPaul. Do you know the location of the two reinforcing strips? __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

04-23-2007, 06:25 PM	#18
GMCPaul Senior Member Join Date: Mar 2000 Location: Rockville,In. USA Posts: 3,721	Re: How many cross sills for a fleetside wood floor? 72" at leading edge of wheel tubs and the 49.5"is about 1/2way maybe 2/3rds the way from back of rear wheel tubs. GMCPauls __________________ Secure Online Catalog for-GMCPauls Truck Parts Email- GMCPAULS@GMAIL.COM

04-23-2007, 07:34 PM	#19
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,685	Re: How many cross sills for a fleetside wood floor? Thank you very much! __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

04-23-2007, 11:19 PM	#20
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: How many cross sills for a fleetside wood floor? looks like mine was missing the short strip but it had the steel plate installed by the PO to help... __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

Register or Log In To remove these advertisements.