Are the boxes on our truck adjustable? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ts71281 · 05-05-2004, 10:50 AM

Just wanted to know if it's possible to loosen up the box mounts on the frame and pull it back about 1/2" or so. My box is too close to my cab and around a sharp corner or turning into a hill where the frame flexes a bit, the box bolts that hold the side and front of my box will tap on my cap. I got a few chips on the cab and the box

Perhaps my mounts are bad? I don't know! I don't want to drive it anymore until I get this fixed. Thanks!

Joe

**JIMs70GMC** · 05-05-2004, 11:22 AM

I don't know if you'll get 1/2" but it could move a little. You could also move the cab forward.

ts71281 · 05-05-2004, 12:59 PM

How many bolts is it to take the box off? Maybe then I'd just elongate the holes and make the box adjustable

I don't want to loosen up the cab and try sliding that.

Joe

ts71281 · 05-05-2004, 03:27 PM

ttt, no one else wants to chime in?

Bowtie67 · 05-05-2004, 04:08 PM

There are eight bolts that hold the bed on the frame, they are 3/8 bolts, There is a little room to possible slide it back but not much. You may be able to get a 1/4 of an inch, but that will all depend on where every thing is at now. I would check all you bushing mounts and make sure there are none missing or totally squashed which could also appear to put the bed and cab close together.

Longhorn Man · 05-06-2004, 04:22 PM

Ypu may want to look at your cab mounts, this is a good sign that they are falling apart.

J.Lance · 05-06-2004, 04:51 PM

Another thing to consider would be swapping out those header bolts. Chevy used both a hex head bolt and a #3 phillips. If you have the hex head, swap it for a phillips and you'll get a little more room plus no corners to knick the paint. This problem seems to be more prevalent on short beds.

05-05-2004, 10:50 AM	#1
ts71281 Registered User Join Date: Apr 2003 Location: Maple Grove, MN Posts: 497	Are the boxes on our truck adjustable? Just wanted to know if it's possible to loosen up the box mounts on the frame and pull it back about 1/2" or so. My box is too close to my cab and around a sharp corner or turning into a hill where the frame flexes a bit, the box bolts that hold the side and front of my box will tap on my cap. I got a few chips on the cab and the box Perhaps my mounts are bad? I don't know! I don't want to drive it anymore until I get this fixed. Thanks! Joe

05-05-2004, 11:22 AM	#2
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	I don't know if you'll get 1/2" but it could move a little. You could also move the cab forward. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

05-05-2004, 04:08 PM	#5
Bowtie67 Registered User Join Date: Jan 2004 Location: NH Posts: 2,266	There are eight bolts that hold the bed on the frame, they are 3/8 bolts, There is a little room to possible slide it back but not much. You may be able to get a 1/4 of an inch, but that will all depend on where every thing is at now. I would check all you bushing mounts and make sure there are none missing or totally squashed which could also appear to put the bed and cab close together. __________________ 1967 C10 - SWBSS Pro Street 427sbc, 700R4 & 4.10 Gears 1948 Chevy FleetMaster Coupe, LS1, (almost done) 1950 Chevy StyleLine Coupe 250/6 3x2 Dueces 2009 Toyota Tundra 1996 Harley RoadKing "I maybe getting old, but I can still burn rubber with the best of them"

05-06-2004, 04:51 PM	#7
J.Lance Too many is never enough! Join Date: May 2003 Location: Idaho Falls, ID Posts: 455	bed header bolts Another thing to consider would be swapping out those header bolts. Chevy used both a hex head bolt and a #3 phillips. If you have the hex head, swap it for a phillips and you'll get a little more room plus no corners to knick the paint. This problem seems to be more prevalent on short beds. __________________ Jason 1968 K10 SWB Fleetside 1971 K2500 GMC LWB 1968 K20 (later frame, donor body) 1972 C20 LWB parts truck 1993 K2500 Suburban, tow rig, 454, 4L80E NEW!! 18' Siem's car hauler 2004 Honda Odyssey (family man!)

05-05-2004, 12:59 PM	#3
ts71281 Registered User Join Date: Apr 2003 Location: Maple Grove, MN Posts: 497	How many bolts is it to take the box off? Maybe then I'd just elongate the holes and make the box adjustable I don't want to loosen up the cab and try sliding that. Joe

05-05-2004, 03:27 PM	#4
ts71281 Registered User Join Date: Apr 2003 Location: Maple Grove, MN Posts: 497	ttt, no one else wants to chime in?

05-06-2004, 04:22 PM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Ypu may want to look at your cab mounts, this is a good sign that they are falling apart.



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