Rear Axel Casting Numbers - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bluec10 · 01-15-2004, 07:27 PM

I was just reading in an exchange manual that rear axels from our trucks have a casting number that includes codes for the gear ratio. Does anybody know where I can get a chart that lists the casting numbers and their specs?

Another question - which 67-87 trucks came with a 3.73 rear end?

skokie · 01-15-2004, 07:31 PM

I do not know were you can get a book to see what the numbers mean but they should be located on the passenger side axle at the top. You may have to clean the area to see them. Once you have them post them up here someone around here has to have the book to decode them.

bluec10 · 01-15-2004, 08:18 PM

I've found all kinds of engine casting number charts on-line. I guess I was hoping that someone knew about a similar on-line source for rear axel data.

If I'm going to the wrecker in winter, I'd just as soon know which truck models/years to look at rather than digging in the snow.

Thanks for the suggestion.

teamroper! · 01-15-2004, 09:10 PM

Here is prefixes for 72 models

JHickson6 · 01-15-2004, 09:27 PM

here's one i've always used http://www.americanclassic.com/paint_test.asp

Hey Blue, you from Winnipeg?

Blue Beard · 01-15-2004, 10:46 PM

where is the code on the rearend.........

bluec10 · 01-16-2004, 12:34 AM

JHickson6 - I'm from Gretna which is about an hour south on the US border.

According to the Chevrolet Trucks Parts Interchange Manual by Paul Herd...on C-10 trucks the code islocated 3-5 inches outboard of the carrier on the front of the right-hand axle tube. I've spent too much time under that truck, but I've never bothered looking for the casting#. And with the temperature being minus flipping ridiculous...I'm not about to check until spring!

01-15-2004, 07:27 PM	#1
bluec10 Registered User Join Date: Apr 2002 Location: Manitoba, Canada Posts: 663	Rear Axel Casting Numbers I was just reading in an exchange manual that rear axels from our trucks have a casting number that includes codes for the gear ratio. Does anybody know where I can get a chart that lists the casting numbers and their specs? Another question - which 67-87 trucks came with a 3.73 rear end? __________________ Present: 2015 Tacoma. Yeah, not a GM, but I love it. 1969 GMC 32,000 - fix, drive, relax, fix... 2019 BMW R1250 GSA - Yahoooooooo 1979 Honda GL 1000 - retro touring at its best. Past: '05 Sierra 4x4 - Had 270,000 KM and running well when it was written-off by a stop sign runner. '94 F-150 from the "F word" company. I'll admit it...good truck. Sold what was left of it for $800 to a guy who came to pick it up at 11:00 PM with cash in hand. Hmm. '79 Sierra Grande (Black) organ donor - perfect rebuildable 4-bolt 350 and a good TH350. '76 Sierra Grande (Orange) - hate isn't too strong a word. Kid who bought it turned it into a hot rod. '68 C-10 R.I.P. - Dad's old truck...too far gone to resurrect. '59 C-50 - with hoist. Truck is gone, wife isn't. Nuff said.

01-15-2004, 07:31 PM	#2
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	I do not know were you can get a book to see what the numbers mean but they should be located on the passenger side axle at the top. You may have to clean the area to see them. Once you have them post them up here someone around here has to have the book to decode them. __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

01-15-2004, 08:18 PM	#3
bluec10 Registered User Join Date: Apr 2002 Location: Manitoba, Canada Posts: 663	I've found all kinds of engine casting number charts on-line. I guess I was hoping that someone knew about a similar on-line source for rear axel data. If I'm going to the wrecker in winter, I'd just as soon know which truck models/years to look at rather than digging in the snow. Thanks for the suggestion. __________________ Present: 2015 Tacoma. Yeah, not a GM, but I love it. 1969 GMC 32,000 - fix, drive, relax, fix... 2019 BMW R1250 GSA - Yahoooooooo 1979 Honda GL 1000 - retro touring at its best. Past: '05 Sierra 4x4 - Had 270,000 KM and running well when it was written-off by a stop sign runner. '94 F-150 from the "F word" company. I'll admit it...good truck. Sold what was left of it for $800 to a guy who came to pick it up at 11:00 PM with cash in hand. Hmm. '79 Sierra Grande (Black) organ donor - perfect rebuildable 4-bolt 350 and a good TH350. '76 Sierra Grande (Orange) - hate isn't too strong a word. Kid who bought it turned it into a hot rod. '68 C-10 R.I.P. - Dad's old truck...too far gone to resurrect. '59 C-50 - with hoist. Truck is gone, wife isn't. Nuff said.

01-15-2004, 09:10 PM	#4
teamroper! Registered User Join Date: Nov 2003 Location: northeast alabama Posts: 258	Here is prefixes for 72 models Attached Images

01-15-2004, 09:27 PM	#5
JHickson6 I Love This Stuff! Join Date: May 2002 Location: Winnipeg, Manitoba, Canada Posts: 739	here's one i've always used http://www.americanclassic.com/paint_test.asp Hey Blue, you from Winnipeg? __________________ My Rides 1967 C10 In Pieces for now 1985 Ford B700 SourPuss Bus - BIG BLUE 2003 Silverado CITY WORKER YELLOW!!

01-15-2004, 10:46 PM	#6
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,831	where is the code on the rearend......... __________________ 1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo

01-16-2004, 12:34 AM	#7
bluec10 Registered User Join Date: Apr 2002 Location: Manitoba, Canada Posts: 663	JHickson6 - I'm from Gretna which is about an hour south on the US border. According to the Chevrolet Trucks Parts Interchange Manual by Paul Herd...on C-10 trucks the code islocated 3-5 inches outboard of the carrier on the front of the right-hand axle tube. I've spent too much time under that truck, but I've never bothered looking for the casting#. And with the temperature being minus flipping ridiculous...I'm not about to check until spring! __________________ Present: 2015 Tacoma. Yeah, not a GM, but I love it. 1969 GMC 32,000 - fix, drive, relax, fix... 2019 BMW R1250 GSA - Yahoooooooo 1979 Honda GL 1000 - retro touring at its best. Past: '05 Sierra 4x4 - Had 270,000 KM and running well when it was written-off by a stop sign runner. '94 F-150 from the "F word" company. I'll admit it...good truck. Sold what was left of it for $800 to a guy who came to pick it up at 11:00 PM with cash in hand. Hmm. '79 Sierra Grande (Black) organ donor - perfect rebuildable 4-bolt 350 and a good TH350. '76 Sierra Grande (Orange) - hate isn't too strong a word. Kid who bought it turned it into a hot rod. '68 C-10 R.I.P. - Dad's old truck...too far gone to resurrect. '59 C-50 - with hoist. Truck is gone, wife isn't. Nuff said.



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