Help AXLE Codes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BBGMC · 07-06-2008, 04:44 PM

I have a 1968 GMC Custom 3/4 ton I have a DANA 60 rear axle and was wondering if anyone had the codes for these axles? The number on mine is BG anyone know what the stock ratio is supposed to be? and if its a Posi or not?

**john** · 07-06-2008, 06:14 PM

If you will tell us what eng/trans you have someone will tell you what it would have came with new. Hard to tell after 40 yrs without pulling the cover. Could probably use an oil change anyhow. Welcome to the board.

**uncle** · 07-06-2008, 08:22 PM

There might be some tags at the rear under the cover bolts that tell the ratio. They are small,so you might need GLASSES and or a flash light.

BBGMC · 07-07-2008, 02:20 AM

Thank you and it is a 1968 3/4 ton GMC factory 396 th400 with a Dana 60 rear axle. this is actually my second truck sadly I had to part with my 70 GMC in an unconventional manner I blacked out while driving and rolled her 3 times and hit a telephone pole I wasn't ready to let go of that truck and it was hard but an S shaped frame was not going to be a feesable fix so my family got together and bought me this one though I did pick it out also i do have lots of usable parts from the 70 I need to get rid of so if you know anyone that needs them just ask about them I will get a list together any way thank you guys for the help

**john** · 07-07-2008, 01:44 PM

The ratio for your truck is 3.54:1 for BB 402 th400.

OrangeCrush1970 · 07-07-2008, 02:29 PM

Check this out:
http://www.americanclassic.com/paint.htm

BBGMC · 07-07-2008, 11:22 PM

Would that be the same as a factory 396 from 1968 cause I do know for a fact that it is a 1972 402 engine and trans. also here are some other codes from my build sheet maybe it can be narrowed down further for the Axle

the axle number is supposed to be a SP60 354 but after reading it and really looking at it it basically tells me that its a SP for Spicer 60 and the 354 for the gear ratio oh man thats a relief now can anyone tell me why the site that orange crush has posted says that 68 only had either a 4.10:1 or 4.26:1 but thank you guys so much for the help

**john** · 07-08-2008, 05:05 PM

I dont know why that site doesn't show the 3.54:1 ratio. All 3/4 ton big blocktrucks 68-72 that had a/t had the ratio. Dont know about std trans trucks. 1/2 ton BB trucks w/auto came with 3.07:1. I have a redbook which lists all of the options doesn't show this ratio either.

N2GMTrux · 07-08-2008, 08:59 PM

Question: Where on the axle is the code located at... Other than on a little tage bolted on the cover,,,,, is the code stamped on the axle tubes or do I have to remove the cover.

BBGMC · 07-08-2008, 09:15 PM

I was wondering where I could possibly get a hold of the red book so I can just look them up as i go

**john** · 07-09-2008, 06:33 PM

BBGMC the redbook is out of print, but you can usually find good used ones on amazon books.

http://www.amazon.com/gp/offer-listi...5643048&sr=1-6

Longhorn Man · 07-09-2008, 08:56 PM

never head of the 4.26... 3.54, 4.10 and 4.56 was the 2 common gears on the 3/4 tons. there was a 5.13 or so also, but far and few between.

07-06-2008, 04:44 PM	#1
BBGMC Registered User Join Date: Oct 2007 Location: Portland, OR Posts: 49	Help AXLE Codes I have a 1968 GMC Custom 3/4 ton I have a DANA 60 rear axle and was wondering if anyone had the codes for these axles? The number on mine is BG anyone know what the stock ratio is supposed to be? and if its a Posi or not?

07-06-2008, 06:14 PM	#2
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Help AXLE Codes If you will tell us what eng/trans you have someone will tell you what it would have came with new. Hard to tell after 40 yrs without pulling the cover. Could probably use an oil change anyhow. Welcome to the board. __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/ Last edited by john; 07-06-2008 at 06:15 PM.

07-06-2008, 08:22 PM	#3
uncle Senior Member Join Date: Aug 2003 Location: Conyers,Ga. Posts: 7,288	Re: Help AXLE Codes There might be some tags at the rear under the cover bolts that tell the ratio. They are small,so you might need GLASSES and or a flash light.

07-07-2008, 02:20 AM	#4
BBGMC Registered User Join Date: Oct 2007 Location: Portland, OR Posts: 49	Re: Help AXLE Codes Thank you and it is a 1968 3/4 ton GMC factory 396 th400 with a Dana 60 rear axle. this is actually my second truck sadly I had to part with my 70 GMC in an unconventional manner I blacked out while driving and rolled her 3 times and hit a telephone pole I wasn't ready to let go of that truck and it was hard but an S shaped frame was not going to be a feesable fix so my family got together and bought me this one though I did pick it out also i do have lots of usable parts from the 70 I need to get rid of so if you know anyone that needs them just ask about them I will get a list together any way thank you guys for the help

07-07-2008, 01:44 PM	#5
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Help AXLE Codes The ratio for your truck is 3.54:1 for BB 402 th400. __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

07-07-2008, 02:29 PM	#6
OrangeCrush1970 Registered User Join Date: Jun 2007 Location: Smyrna, GA Posts: 709	Re: Help AXLE Codes Check this out: http://www.americanclassic.com/paint.htm __________________ *Rottenwood Garage* 1970...71...72 C1500 aka Orange aka Sideshow Bob 540 BB Straub Roller Cam, AFR Magnums, XP 950, TKO 600 2 Tons of Fun

07-07-2008, 11:22 PM	#7
BBGMC Registered User Join Date: Oct 2007 Location: Portland, OR Posts: 49	Re: Help AXLE Codes Would that be the same as a factory 396 from 1968 cause I do know for a fact that it is a 1972 402 engine and trans. also here are some other codes from my build sheet maybe it can be narrowed down further for the Axle the axle number is supposed to be a SP60 354 but after reading it and really looking at it it basically tells me that its a SP for Spicer 60 and the 354 for the gear ratio oh man thats a relief now can anyone tell me why the site that orange crush has posted says that 68 only had either a 4.10:1 or 4.26:1 but thank you guys so much for the help

07-08-2008, 05:05 PM	#8
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Help AXLE Codes I dont know why that site doesn't show the 3.54:1 ratio. All 3/4 ton big blocktrucks 68-72 that had a/t had the ratio. Dont know about std trans trucks. 1/2 ton BB trucks w/auto came with 3.07:1. I have a redbook which lists all of the options doesn't show this ratio either. __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

07-08-2008, 08:59 PM	#9
N2GMTrux Registered User Join Date: Jan 2007 Location: Fort Worth, TX 76133 Posts: 406	Re: Help AXLE Codes Question: Where on the axle is the code located at... Other than on a little tage bolted on the cover,,,,, is the code stamped on the axle tubes or do I have to remove the cover. __________________ ...try'n to be a little! This is a great site. http://67-72chevytrucks.com/vboard/s...d.php?t=157669 http://www.67-72chevytrucks.com/vboa...d.php?t=375640 Last edited by N2GMTrux; 07-08-2008 at 09:03 PM. Reason: Completed my question

07-08-2008, 09:15 PM	#10
BBGMC Registered User Join Date: Oct 2007 Location: Portland, OR Posts: 49	Re: Help AXLE Codes I was wondering where I could possibly get a hold of the red book so I can just look them up as i go

07-09-2008, 06:33 PM	#11
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Help AXLE Codes BBGMC the redbook is out of print, but you can usually find good used ones on amazon books. http://www.amazon.com/gp/offer-listi...5643048&sr=1-6 __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

07-09-2008, 08:56 PM	#12
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Help AXLE Codes never head of the 4.26... 3.54, 4.10 and 4.56 was the 2 common gears on the 3/4 tons. there was a 5.13 or so also, but far and few between.



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