Measurements: Back of cab to axle centerline - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*FormerMember* · 03-17-2008, 08:06 PM

Trying to determine how long I should make my frame.

I really want to go with a long bed on my dually project, but the C40/C50 frame is giving me fits and starts.

Can someone measure from the back of their cab to the axle centerline, please?

Longhorn

Long Bed

Short Bed.

I have a measurement of 63" which leaves me scratching my head. I can flip the springs, which would give me 3" offset.

**special-K** · 03-17-2008, 09:05 PM

The standard measurements used by truck body companies is the Cab to Axle dimension (CA).A 3/4t(127"WB) is a 56" CA(8' body),short 1t(133"WB) cab`n`chassis is 60" CA(9' body/10' flatbed),and the long 1t(157"WB) cab`n`chassis is 84" CA(11' body/12' flatbed).The body I refer to is the utility bed/service body.
I know these numbers aren`t taken directly from one of these trucks.But,that was the standard until trucks became anything but standard many years later.

Longhorn Man · 03-17-2008, 09:10 PM

to add to tims response, those are inside bed dimentions

jeffspower · 03-17-2008, 09:22 PM

We don't build many 60" CA's at work. A 19K or heavier chassis looks pretty short with a utility body on them- like a shortbox pickup. 84" CA's look more proportionally correct to me.

Tim- is your math off somewhere? If 133 is 60, woudn't 127 be 54?

jeffspower · 03-17-2008, 09:31 PM

Quote:

Originally Posted by grendel

I have a measurement of 63" which leaves me scratching my head.

It would be considered a 60" CA. Some manufacturers figure in 3" body clearance automatically. Some let you specify down to a fraction exactly what you want when ordering. Even today, GM & Ford offer only basic configurations. We have to work around their dimensions all the time.

*FormerMember* · 03-17-2008, 10:11 PM

Thanks guys. This makes more sense to me now.

I can flip my springs and fit a 8' bed on it.

*FormerMember* · 06-05-2008, 04:53 PM

Does anyone have the LongHorn Cab to Axle measurement?

jeffspower · 06-05-2008, 07:14 PM

Here's my '72 8 foot bed actual measurements.

Also, FYI... might make it easier to figure what to cut out if needed... from the center of the rear spring "forward" eye to the center of the rear cab mount vertical bolt measures 30- 1/2".

*FormerMember* · 06-05-2008, 08:12 PM

Thanks. I can flip my springs and get it to fit, with a bit of creativity.

03-17-2008, 08:06 PM	#1
FormerMember Account Suspended Join Date: Feb 2004 Posts: 3,051	Measurements: Back of cab to axle centerline Trying to determine how long I should make my frame. I really want to go with a long bed on my dually project, but the C40/C50 frame is giving me fits and starts. Can someone measure from the back of their cab to the axle centerline, please? Longhorn Long Bed Short Bed. I have a measurement of 63" which leaves me scratching my head. I can flip the springs, which would give me 3" offset. Last edited by FormerMember; 03-17-2008 at 08:06 PM.

03-17-2008, 09:05 PM	#2
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Measurements: Back of cab to axle centerline The standard measurements used by truck body companies is the Cab to Axle dimension (CA).A 3/4t(127"WB) is a 56" CA(8' body),short 1t(133"WB) cab`n`chassis is 60" CA(9' body/10' flatbed),and the long 1t(157"WB) cab`n`chassis is 84" CA(11' body/12' flatbed).The body I refer to is the utility bed/service body. I know these numbers aren`t taken directly from one of these trucks.But,that was the standard until trucks became anything but standard many years later. __________________ "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 ~ Last edited by special-K; 03-17-2008 at 09:07 PM.

03-17-2008, 09:10 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Measurements: Back of cab to axle centerline to add to tims response, those are inside bed dimentions

03-17-2008, 09:22 PM	#4
jeffspower Well, Whoop-dee-do! Join Date: Mar 2003 Location: Easton, Mo. pop.- me & scarcely a few others Posts: 2,302	Re: Measurements: Back of cab to axle centerline We don't build many 60" CA's at work. A 19K or heavier chassis looks pretty short with a utility body on them- like a shortbox pickup. 84" CA's look more proportionally correct to me. Tim- is your math off somewhere? If 133 is 60, woudn't 127 be 54? __________________ '68 GMC shortbox 4x4 350/SM465/T221- bought it in '83 SOLD '72 K20 500 Cad/TH400/NP205 SOLD '92 Chevy 2500 6.5 mech TD 4L80E crusty daily driver '72 Monte Carlo... sweet low mile toy '11 Dodge Challenger IE 392 6spd... midlife car

03-17-2008, 10:11 PM	#6
FormerMember Account Suspended Join Date: Feb 2004 Posts: 3,051	Re: Measurements: Back of cab to axle centerline Thanks guys. This makes more sense to me now. I can flip my springs and fit a 8' bed on it.

06-05-2008, 04:53 PM	#7
FormerMember Account Suspended Join Date: Feb 2004 Posts: 3,051	Re: Measurements: Back of cab to axle centerline Does anyone have the LongHorn Cab to Axle measurement?

06-05-2008, 07:14 PM	#8
jeffspower Well, Whoop-dee-do! Join Date: Mar 2003 Location: Easton, Mo. pop.- me & scarcely a few others Posts: 2,302	Re: Measurements: Back of cab to axle centerline Here's my '72 8 foot bed actual measurements. Also, FYI... might make it easier to figure what to cut out if needed... from the center of the rear spring "forward" eye to the center of the rear cab mount vertical bolt measures 30- 1/2". Attached Images __________________ '68 GMC shortbox 4x4 350/SM465/T221- bought it in '83 SOLD '72 K20 500 Cad/TH400/NP205 SOLD '92 Chevy 2500 6.5 mech TD 4L80E crusty daily driver '72 Monte Carlo... sweet low mile toy '11 Dodge Challenger IE 392 6spd... midlife car

06-05-2008, 08:12 PM	#9
FormerMember Account Suspended Join Date: Feb 2004 Posts: 3,051	Re: Measurements: Back of cab to axle centerline Thanks. I can flip my springs and get it to fit, with a bit of creativity.



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