More Axle #s Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Palf70Step** · 11-26-2006, 09:16 PM

I pulled the number off my axle tube and got thise

THA W137

According to my charts 69 only used 2 letter axle codes (HA for 69 I show 3.73) and 70 on used 3 letters (71 shows THA for 3.07). Mine are 6 lug axles and I haven't measured it yet to see if it is a narrow axle or the 70 & later axles. Did they have the extra letter on the earlier axles? Since so many other parts from the 69 came from a 71 I am not sure if they swapped rear ends and stuck in 70 6 lug axles on it.

Also, does anyone know what the W137 part of the number means. I don't have any reference for that portion of the number.

Thanks

Ram-Man · 11-26-2006, 10:49 PM

Where did you find the axle code chart?? Are the housings shorter or are the axle shafts shorter? I have an axle from a 70 and one from a 72 and the housings measure the same.

**Palf70Step** · 11-26-2006, 11:05 PM

I use this for a lot of my decoding
http://www.americanclassic.com/paint_test.asp

In early 70 the rear end tubes and axles were made wider by about 3/4 inch. Your 70 (as long as it is a late year run) and the 72 should interchange fine

11-26-2006, 09:16 PM	#1
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 46,842	More Axle #s Question I pulled the number off my axle tube and got thise THA W137 According to my charts 69 only used 2 letter axle codes (HA for 69 I show 3.73) and 70 on used 3 letters (71 shows THA for 3.07). Mine are 6 lug axles and I haven't measured it yet to see if it is a narrow axle or the 70 & later axles. Did they have the extra letter on the earlier axles? Since so many other parts from the 69 came from a 71 I am not sure if they swapped rear ends and stuck in 70 6 lug axles on it. Also, does anyone know what the W137 part of the number means. I don't have any reference for that portion of the number. Thanks __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! Last edited by Palf70Step; 11-26-2006 at 09:17 PM.

11-26-2006, 10:49 PM	#2
Ram-Man Senior Member Join Date: Aug 2006 Location: Minnesota Posts: 943	Re: Mpre Axle #s Question Where did you find the axle code chart?? Are the housings shorter or are the axle shafts shorter? I have an axle from a 70 and one from a 72 and the housings measure the same.

11-26-2006, 11:05 PM	#3
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 46,842	Re: Mpre Axle #s Question I use this for a lot of my decoding http://www.americanclassic.com/paint_test.asp In early 70 the rear end tubes and axles were made wider by about 3/4 inch. Your 70 (as long as it is a late year run) and the 72 should interchange fine __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! Last edited by Palf70Step; 11-26-2006 at 11:06 PM.



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