Bed Roll issues - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Big69C20 Toy · 07-27-2002, 12:40 PM

Well here's the thing fellas. When i go over any sorta real big angled driveways at an angle or anything that causes the truck to kinda twist like that my bed seems to rub those couple bolts up near the top/front of the bed on the back of my cab. It's taken off a layer of paint from both sides and i had the thing not painted not too long ago. Any thoughts as to why it's doing this?
Frame flex? umm i dunno whats up with it. new wood bed and all new bed stuff back there so i cant quite figure it out.
thanks for the help.

Denny · 07-27-2002, 12:52 PM

Sounds like it might be weak cab mounts. Might be the cab moving and not the bed.

Big69C20 Toy · 07-27-2002, 12:54 PM

possible but i replaced them with poly ones about a year ago when i bought the truck, it was my first new toy

Paul Clark · 07-27-2002, 01:02 PM

Can you move the bed back farther away from the cab? I asked how far back the bed should be mounted awhile ago, and all the replies said at least an inch back from the middle of the cab.

Big69C20 Toy · 07-27-2002, 01:05 PM

It's at least an inch back, i thought that too at first, but it's all the way back, i set it up that way when i redid the bed.

Paul Clark · 07-27-2002, 01:09 PM

Are the nuts tight on the bed mount bolts?

Big69C20 Toy · 07-27-2002, 01:13 PM

yep, like i said we did it lately. the bed got done in march when i got home, tightened it all with pneumatic and the thing is solid as all heck.

Big69C20 Toy · 07-28-2002, 01:07 AM

ttt

**Classic Heartbeat** · 07-28-2002, 11:14 AM

Well I will throw this out for a thought... I believe it is your poly mounts. Why? Because they don't have any give and your frame is made to flex....... Therefor when your frame flexes in two different directions the mounts don't give to minimize the movement of the cab and front clip. I also think that they tear up bodies for the same reason... I know there is a bunch of guys out there with the poly bushings that havn't had any problems, but I have seen at least 3 trucks with the bolts pulled right through the floor with them. GM designed these trucks to flex and if you don't want your cab to move as much when you are on uneven surfaces, go back to the rubber mounts.... WES www.ClassicHeartbeat.com

Big69C20 Toy · 07-28-2002, 11:36 AM

well thanks for that one Wes, didnt quite think of it like that. The cab on mine is in great shape as it's a cali truck with no rust. might switch to rubber i suppose later. hope for now it dont mess my cab up. its all stricktly street drivin so i can hope!

ebfabman · 07-28-2002, 11:56 AM

I think WES hit the nail right on the top of the head. Poly mounts don't have as much cushion in them, they are more ridged. The truck frame has some flex, thats why I don't quite understand "boxing" the frame some people talk about, but maybe its a racing thing...........

Denny · 07-28-2002, 07:36 PM

I have the poly cab mounts on my cab also.

07-27-2002, 12:40 PM	#1
Big69C20 Toy Livin' it up. Join Date: Nov 2001 Location: Richland, MI Posts: 2,212	Bed Roll issues Well here's the thing fellas. When i go over any sorta real big angled driveways at an angle or anything that causes the truck to kinda twist like that my bed seems to rub those couple bolts up near the top/front of the bed on the back of my cab. It's taken off a layer of paint from both sides and i had the thing not painted not too long ago. Any thoughts as to why it's doing this? Frame flex? umm i dunno whats up with it. new wood bed and all new bed stuff back there so i cant quite figure it out. thanks for the help. __________________ -Greg; Sold the 69 C20. It's off to a better home with more love! Now onto the 86 CUCV M1009; K5 blazer with 6.2L diesel, corp 10 bolt axles, Detroit locker in the rear, trutrac front, 3.73 gears, 35" tires.

07-27-2002, 12:52 PM	#2
Denny Registered User Join Date: Jul 2002 Location: Cedar Hill, MO Posts: 426	Sounds like it might be weak cab mounts. Might be the cab moving and not the bed. __________________ 1969 Chevy C10. Dakota Digital Gauges, 383 Votex Engine, MSD 8361 Distributor, MSD 6A Unit, Demon Carb, Phoenix Transmission 4L80E trans, 3:73 Posi Rear End Early Classics 6 Lug Disc Brakes and Spindles All Stainless Lines

07-27-2002, 12:54 PM	#3
Big69C20 Toy Livin' it up. Join Date: Nov 2001 Location: Richland, MI Posts: 2,212	possible but i replaced them with poly ones about a year ago when i bought the truck, it was my first new toy __________________ -Greg; Sold the 69 C20. It's off to a better home with more love! Now onto the 86 CUCV M1009; K5 blazer with 6.2L diesel, corp 10 bolt axles, Detroit locker in the rear, trutrac front, 3.73 gears, 35" tires.

07-27-2002, 01:05 PM	#5
Big69C20 Toy Livin' it up. Join Date: Nov 2001 Location: Richland, MI Posts: 2,212	It's at least an inch back, i thought that too at first, but it's all the way back, i set it up that way when i redid the bed. __________________ -Greg; Sold the 69 C20. It's off to a better home with more love! Now onto the 86 CUCV M1009; K5 blazer with 6.2L diesel, corp 10 bolt axles, Detroit locker in the rear, trutrac front, 3.73 gears, 35" tires.

07-27-2002, 01:13 PM	#7
Big69C20 Toy Livin' it up. Join Date: Nov 2001 Location: Richland, MI Posts: 2,212	yep, like i said we did it lately. the bed got done in march when i got home, tightened it all with pneumatic and the thing is solid as all heck. __________________ -Greg; Sold the 69 C20. It's off to a better home with more love! Now onto the 86 CUCV M1009; K5 blazer with 6.2L diesel, corp 10 bolt axles, Detroit locker in the rear, trutrac front, 3.73 gears, 35" tires.

07-27-2002, 01:02 PM	#4
Paul Clark Registered User Join Date: Apr 2002 Location: Center Point, IA Posts: 502	Can you move the bed back farther away from the cab? I asked how far back the bed should be mounted awhile ago, and all the replies said at least an inch back from the middle of the cab.

07-27-2002, 01:09 PM	#6
Paul Clark Registered User Join Date: Apr 2002 Location: Center Point, IA Posts: 502	Are the nuts tight on the bed mount bolts?

07-28-2002, 01:07 AM	#8
Big69C20 Toy Livin' it up. Join Date: Nov 2001 Location: Richland, MI Posts: 2,212	ttt __________________ -Greg; Sold the 69 C20. It's off to a better home with more love! Now onto the 86 CUCV M1009; K5 blazer with 6.2L diesel, corp 10 bolt axles, Detroit locker in the rear, trutrac front, 3.73 gears, 35" tires.

07-28-2002, 11:14 AM	#9
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	Well I will throw this out for a thought... I believe it is your poly mounts. Why? Because they don't have any give and your frame is made to flex....... Therefor when your frame flexes in two different directions the mounts don't give to minimize the movement of the cab and front clip. I also think that they tear up bodies for the same reason... I know there is a bunch of guys out there with the poly bushings that havn't had any problems, but I have seen at least 3 trucks with the bolts pulled right through the floor with them. GM designed these trucks to flex and if you don't want your cab to move as much when you are on uneven surfaces, go back to the rubber mounts.... WES www.ClassicHeartbeat.com __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

07-28-2002, 11:36 AM	#10
Big69C20 Toy Livin' it up. Join Date: Nov 2001 Location: Richland, MI Posts: 2,212	well thanks for that one Wes, didnt quite think of it like that. The cab on mine is in great shape as it's a cali truck with no rust. might switch to rubber i suppose later. hope for now it dont mess my cab up. its all stricktly street drivin so i can hope! __________________ -Greg; Sold the 69 C20. It's off to a better home with more love! Now onto the 86 CUCV M1009; K5 blazer with 6.2L diesel, corp 10 bolt axles, Detroit locker in the rear, trutrac front, 3.73 gears, 35" tires.

07-28-2002, 11:56 AM	#11
ebfabman Registered User Join Date: Nov 2001 Location: Concord, NC Posts: 2,488	I think WES hit the nail right on the top of the head. Poly mounts don't have as much cushion in them, they are more ridged. The truck frame has some flex, thats why I don't quite understand "boxing" the frame some people talk about, but maybe its a racing thing...........

07-28-2002, 07:36 PM	#12
Denny Registered User Join Date: Jul 2002 Location: Cedar Hill, MO Posts: 426	I have the poly cab mounts on my cab also. __________________ 1969 Chevy C10. Dakota Digital Gauges, 383 Votex Engine, MSD 8361 Distributor, MSD 6A Unit, Demon Carb, Phoenix Transmission 4L80E trans, 3:73 Posi Rear End Early Classics 6 Lug Disc Brakes and Spindles All Stainless Lines



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