Hate to ask but need to identify my rear axle - The 1947 - Present Chevrolet & GMC Truck Message Board Network

69andHalf · 02-02-2016, 09:05 PM

I'm looking to purchase some new axles to convert my 6 lug to a 5. My truck is a bit of a Frankenstein as the previous owner used several donner trucks. This is my problem. The rolling chassis is a 69 and the cab etc is a 70. The numbers I can make out are:

NF38.....

And I can't find that combo on this website.

http://www.348-409.com/differential.html

Help!

69andHalf · 02-02-2016, 09:13 PM

Found somebody else looking for a stamp code:

nf3896838

Pretty sure that's mine also. Says it's from a 70. Can anyone confirm that?

Sklptrljay · 02-03-2016, 02:52 AM

http://67-72chevytrucks.com/vboard/s...d.php?t=578793

Try this link, it has all the charts. I don't see your code and it doesn't sound like a 67-72 code. Are you looking on the top of the passenger side tube?

Jrainman · 02-03-2016, 09:28 AM

axle code you are looking for is on passenger side of axle ,I have found stampings on these rears vary a little , they are in line so to speak with your stock shock mount , sometimes behind the shock mount sometimes 2-3 inches closer to the diff housing ,but in that general area

**LockDoc** · 02-03-2016, 09:37 AM

Quote:

Originally Posted by Sklptrljay

http://67-72chevytrucks.com/vboard/s...d.php?t=578793

Try this link, it has all the charts. I don't see your code and it doesn't sound like a 67-72 code. Are you looking on the top of the passenger side tube?

Posts #8 & #19 in the above thread show a couple of the code locations.

LockDoc

69andHalf · 02-03-2016, 11:22 AM

Quote:

Originally Posted by LockDoc

Posts #8 & #19 in the above thread show a couple of the code locations.

LockDoc

Thank you so much! I located the code in question TDA 0615 2

Looks like it indeed is a 70' so I think

El Dorado Jim · 02-03-2016, 05:08 PM

love this forum, everybody is so helpful

**CC69Rat** · 02-03-2016, 05:54 PM

Being a 70 axle it could be a different length. 67-late 69 and early build 70 trucks had a narrow axle housing. Late 70 on up had a wider housing. Measure between the inside edges of the brake backing plates. The early housing will be 55.5" long. The later housing is 57"

If you're ordering axles and have 67-70 55.5" housing you want the 30.5" long 5 lug axles. If it's the 57" housing you need 31 5/16" axles.

69andHalf · 02-03-2016, 06:42 PM

Quote:

Originally Posted by CC69Rat

Being a 70 axle it could be a different length. 67-late 69 and early build 70 trucks had a narrow axle housing. Late 70 on up had a wider housing. Measure between the inside edges of the brake backing plates. The early housing will be 55.5" long. The later housing is 57"

If you're ordering axles and have 67-70 55.5" housing you want the 30.5" long 5 lug axles. If it's the 57" housing you need 31 5/16" axles.

Thank you so much again! Y'all have been very helpful!

02-02-2016, 09:13 PM	#2
69andHalf Registered User Join Date: Aug 2012 Location: Pasco, WA Posts: 9	Re: Hate to ask but need to identify my rear axle Found somebody else looking for a stamp code: nf3896838 Pretty sure that's mine also. Says it's from a 70. Can anyone confirm that?

02-03-2016, 02:52 AM	#3
Sklptrljay Registered User Join Date: Apr 2012 Location: Stillwater, Oklahoma Posts: 874	Re: Hate to ask but need to identify my rear axle http://67-72chevytrucks.com/vboard/s...d.php?t=578793 Try this link, it has all the charts. I don't see your code and it doesn't sound like a 67-72 code. Are you looking on the top of the passenger side tube? __________________ 1971 C/10 SWB, 15x8 Rallys, 4.5" X 7" static drop, C-notched, 350/350, 3.73 Posi. .........A 383 and Gear Vendors are on my bucket list. 1972 GMC 4X4 K1500 Survivor - Sold No matter what problems life throws at you, your time on Earth can be incredibly fulfilling and rewarding.....if you just lower your expectations. -Phil Dunphy

02-03-2016, 09:28 AM	#4
Jrainman Registered User Join Date: Jul 2015 Location: North East PA Posts: 682	Re: Hate to ask but need to identify my rear axle axle code you are looking for is on passenger side of axle ,I have found stampings on these rears vary a little , they are in line so to speak with your stock shock mount , sometimes behind the shock mount sometimes 2-3 inches closer to the diff housing ,but in that general area

02-03-2016, 05:08 PM	#7
El Dorado Jim Registered User Join Date: Dec 2009 Location: El Dorado Ca Posts: 3,374	Re: Hate to ask but need to identify my rear axle love this forum, everybody is so helpful

02-02-2016, 09:05 PM	#1
69andHalf Registered User Join Date: Aug 2012 Location: Pasco, WA Posts: 9	Hate to ask but need to identify my rear axle I'm looking to purchase some new axles to convert my 6 lug to a 5. My truck is a bit of a Frankenstein as the previous owner used several donner trucks. This is my problem. The rolling chassis is a 69 and the cab etc is a 70. The numbers I can make out are: NF38..... And I can't find that combo on this website. http://www.348-409.com/differential.html Help!

02-03-2016, 05:54 PM	#8
CC69Rat Senior Member Join Date: Jan 2011 Location: Chattanooga TN Posts: 6,205	Re: Hate to ask but need to identify my rear axle Being a 70 axle it could be a different length. 67-late 69 and early build 70 trucks had a narrow axle housing. Late 70 on up had a wider housing. Measure between the inside edges of the brake backing plates. The early housing will be 55.5" long. The later housing is 57" If you're ordering axles and have 67-70 55.5" housing you want the 30.5" long 5 lug axles. If it's the 57" housing you need 31 5/16" axles. __________________ Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 Currently underway 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet Sold 1985 Silverado Short Fleet Sold 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride)



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