truck cab - The 1947 - Present Chevrolet & GMC Truck Message Board Network

us111 · 03-19-2005, 01:29 PM

hi all,,i'm rebuilding a 1976 K-10 stepside. MY question is i bought a 1978 cab that was only a 2 wheel drive so it has the small hump,underneath the truck in the hump is what appears to be like a cut out all the way around,it appears as though it would be the correct cut out for a 4 wheel drive,kinda like when the cabs were made they could be used for either 4 or 2 wheel. DOES anyone know anything about this or may have done it before..thank you all for any help..

Hemikiller · 03-21-2005, 11:17 AM

I swapped a '78 2X auto cab onto my '73. The '73 is a stick, so I had to cut out the floor on the '78, and used the hump from the '73. The hump on your 4X should unbolt from the floor. I used 1/4" sheetmetal screws to attach the hump to the '78, with a little seam sealer. Been like that for 10 years with no problems....

ElGracho · 03-21-2005, 09:15 PM

There are at least three different cab floors used on these trucks. 2wd autos have a short hump that doesn't unbolt. 4x4 autos have a tall hump that doesn't unbolt. Manual trans trucks have a hump that unbolts. I've heard others say that they had a factory auto truck with a trans hump that unbolted.

You can use the 2wd cab by modifying it in the trans hump area or using a 2" body lift.

us111 · 03-21-2005, 09:19 PM

the cover on the 4x4 floor hump unbolts but on the 2 wheel drive,78 cab there is no cover to unbolt,it is just a "short hump" but stamped into the hump of the 78 2 wheel drive cab is a cut out ,or what looks like a cut out i thought may be for a 4x4 ? thanks to all

i will try to take some pic's tommorrow of what i am talking about.

us111 · 03-22-2005, 09:30 PM

here are the pics of the 2 wheel drive cab hump i am talking about,it appears if you follow these lines it would be correct for 4 wheel drive?? thank you

Hemikiller · 03-23-2005, 10:13 AM

Yup, IIRC all you have to do is cut on the line.

I remember that I actually used the hump as a template to drill holes, then I used "U" nuts and the factory bolts to secure the hump to the floor as the original tunnel had welded in nuts.

us111 · 03-23-2005, 01:13 PM

thank you hemikiller,thought it was,wanted to make sure,my old cab (the 4x4) has the nut's welded underneath also,,so sounds like the same deal,,again thanks for the help.....

03-19-2005, 01:29 PM	#1
us111 Registered User Join Date: Jul 2004 Location: ashland oh Posts: 660	truck cab hi all,,i'm rebuilding a 1976 K-10 stepside. MY question is i bought a 1978 cab that was only a 2 wheel drive so it has the small hump,underneath the truck in the hump is what appears to be like a cut out all the way around,it appears as though it would be the correct cut out for a 4 wheel drive,kinda like when the cabs were made they could be used for either 4 or 2 wheel. DOES anyone know anything about this or may have done it before..thank you all for any help..

03-21-2005, 11:17 AM	#2
Hemikiller Registered User Join Date: Feb 2005 Location: Killingworth, CT Posts: 30	I swapped a '78 2X auto cab onto my '73. The '73 is a stick, so I had to cut out the floor on the '78, and used the hump from the '73. The hump on your 4X should unbolt from the floor. I used 1/4" sheetmetal screws to attach the hump to the '78, with a little seam sealer. Been like that for 10 years with no problems.... __________________ Wise man once told me; "Don't show me what you know, show me what you don't know" Nothing worthwhile is ever easy Present Stable: 73 C-30 CrewCab Dually 4X2 91 4X2 'burban 89 4X4 'burban 84 4x2 'burban (R.I.P.)

03-21-2005, 09:15 PM	#3
ElGracho Gentleman Jim Driver Join Date: Nov 2002 Location: Poulsbo, WA Posts: 1,553	There are at least three different cab floors used on these trucks. 2wd autos have a short hump that doesn't unbolt. 4x4 autos have a tall hump that doesn't unbolt. Manual trans trucks have a hump that unbolts. I've heard others say that they had a factory auto truck with a trans hump that unbolted. You can use the 2wd cab by modifying it in the trans hump area or using a 2" body lift. __________________ Joe '75 GMC Gentleman Jim '84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter) '85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '89 R3500 Flatbed

03-21-2005, 09:19 PM	#4
us111 Registered User Join Date: Jul 2004 Location: ashland oh Posts: 660	cover the cover on the 4x4 floor hump unbolts but on the 2 wheel drive,78 cab there is no cover to unbolt,it is just a "short hump" but stamped into the hump of the 78 2 wheel drive cab is a cut out ,or what looks like a cut out i thought may be for a 4x4 ? thanks to all i will try to take some pic's tommorrow of what i am talking about. Last edited by us111; 03-21-2005 at 09:24 PM. Reason: needed to add something

03-22-2005, 09:30 PM	#5
us111 Registered User Join Date: Jul 2004 Location: ashland oh Posts: 660	cut out here are the pics of the 2 wheel drive cab hump i am talking about,it appears if you follow these lines it would be correct for 4 wheel drive?? thank you Attached Images

03-23-2005, 10:13 AM	#6
Hemikiller Registered User Join Date: Feb 2005 Location: Killingworth, CT Posts: 30	Yup, IIRC all you have to do is cut on the line. I remember that I actually used the hump as a template to drill holes, then I used "U" nuts and the factory bolts to secure the hump to the floor as the original tunnel had welded in nuts. __________________ Wise man once told me; "Don't show me what you know, show me what you don't know" Nothing worthwhile is ever easy Present Stable: 73 C-30 CrewCab Dually 4X2 91 4X2 'burban 89 4X4 'burban 84 4x2 'burban (R.I.P.)

03-23-2005, 01:13 PM	#7
us111 Registered User Join Date: Jul 2004 Location: ashland oh Posts: 660	floor thank you hemikiller,thought it was,wanted to make sure,my old cab (the 4x4) has the nut's welded underneath also,,so sounds like the same deal,,again thanks for the help.....

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