71 or 72 rear end code? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sgtjed · 06-06-2003, 08:22 PM

i just bought me a 5 lug 71 or 72 rear today for 125.00

just want to make sure it is a 3.08 gear ratio. i have a 3.73 6 lug in it now and i wanted to get better milage down the interstate.

here is the numbers i got off the axle tube.

TRR W047 1

i dunno if it is a 71 or 72 rear. the truck i got it out of was a 402 auto truck,according to the glovebox. it was hugger orange and white with parchment interior. all the interior was gone but the front fenders and bed looked pretty good and was an air cab.

the guy pulled the cover and let me take a peek inside before i bought it and it shows no signs of wear and the gasket looked to have been changed at one point in its life. well any way the guy at the salvage said that it was a 3.08 i just wanna make sure.

also he let me have all the drums and brakes off of it,which were brand spanking new,complete with new wheel cylinders

another good thing is my speedo will be correct again

Steven Sellers · 06-06-2003, 08:45 PM

http://www.americanclassic.com/paint.htm?p1=axles

According to this site looks like 307

71-longbed · 06-07-2003, 09:37 AM

where on the axle do you find that code ??

Steven Sellers · 06-07-2003, 10:54 AM

Mine is on the passenger side axle tube, mine is on top side

Steven Sellers · 06-07-2003, 11:24 AM

Im sorry mine is actually facing toward the cab

**Joesjunk** · 06-07-2003, 03:09 PM

TRR is a 1971, 3:07 ratio, non-posi.

sgtjed · 06-07-2003, 03:40 PM

cool,that what i wanted thanks guys

71-longbed · 06-08-2003, 02:46 PM

ok .... need some more help on where those letters are located...is it between the u bolt and the drum or between the u bolt and the differential ?? i looked on the driver side ....30 years of dirt makes it hard to locate.... i want a good idea on loaction before i start cleaning to find these letters

thanks a million

sgtjed · 06-08-2003, 02:51 PM

i found mine to the left of the u-bolt on the pass tube,kinda almost to the top.

71-longbed · 06-08-2003, 03:13 PM

is that while looking toward the back or front of the truck ???

sgtjed · 06-08-2003, 04:02 PM

from underneath looking toward the rear of the truck.

the numbers are on the cab side of the rear end.

the numbers are gonna be almost hard to see with out taking a wire prush to that area,as they were just stamped in with a hammer and stamp set.

71-longbed · 06-08-2003, 05:40 PM

yet .... i did find this NF3896838 on the passenger side differential housing.... i've cleaned that axle housing completely off with a brush and carb cleaner and no sight of any stamped T letters.... aarrrrgghhhh... i wanna know what gear ratio i have ... for sure ... its either 3.07 or 3.73 .... during light acceration in in 3rd by 30 mph with my turbo 350 trans .... but when i step on it hard on usuallybegin 3rd at 40 or 45 ..depending the quanity of foot applied

help...i wish i had a tach so i could give you 60mph rpm figures

peace

Steven Sellers · 06-08-2003, 09:14 PM

Its on the passenger side of the truck between the diff and the ubolt on the tube. Mine faces toward you if you are laying in front of the rear pass tire looking back. These letters arenet much bigger than the letters that we are writing here. I had to take a wire brush to mine to find them

06-06-2003, 08:22 PM	#1
sgtjed What if? Join Date: Oct 2002 Location: Choctaw,Oklahoma Posts: 649	71 or 72 rear end code? i just bought me a 5 lug 71 or 72 rear today for 125.00 just want to make sure it is a 3.08 gear ratio. i have a 3.73 6 lug in it now and i wanted to get better milage down the interstate. here is the numbers i got off the axle tube. TRR W047 1 i dunno if it is a 71 or 72 rear. the truck i got it out of was a 402 auto truck,according to the glovebox. it was hugger orange and white with parchment interior. all the interior was gone but the front fenders and bed looked pretty good and was an air cab. the guy pulled the cover and let me take a peek inside before i bought it and it shows no signs of wear and the gasket looked to have been changed at one point in its life. well any way the guy at the salvage said that it was a 3.08 i just wanna make sure. also he let me have all the drums and brakes off of it,which were brand spanking new,complete with new wheel cylinders another good thing is my speedo will be correct again __________________ 2002 red extended cab Silverado 2002 Wheatland yellow Suburban Last edited by sgtjed; 06-06-2003 at 08:28 PM.

06-06-2003, 08:45 PM	#2
Steven Sellers Registered User Join Date: Jan 2002 Location: North Carolina Posts: 692	http://www.americanclassic.com/paint.htm?p1=axles According to this site looks like 307 __________________ 2008 Buick Enclave(wifes new non wrecked) 1996 Jeep Cherokee 2002 2500HD 6.0L (traded) 1998 Jeep Grand Cherokee(wifes/wrecked) 1977 DJ5 postal jeep(mmm lots of fun) 1988 Toyota 2wd p/u(DD, blewup 199,000) 1991 Toyota 2ed p/u (sry just cant break these things) 1997 XR70 Honda 1991 Z50(FOR SALE) 1972 Z50 Honda 1970 SWB 350/knucklebuster "The adventure begins and I am confident that there will be no end".

06-07-2003, 09:37 AM	#3
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	where on the axle do you find that code ?? __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.

06-07-2003, 10:54 AM	#4
Steven Sellers Registered User Join Date: Jan 2002 Location: North Carolina Posts: 692	Mine is on the passenger side axle tube, mine is on top side __________________ 2008 Buick Enclave(wifes new non wrecked) 1996 Jeep Cherokee 2002 2500HD 6.0L (traded) 1998 Jeep Grand Cherokee(wifes/wrecked) 1977 DJ5 postal jeep(mmm lots of fun) 1988 Toyota 2wd p/u(DD, blewup 199,000) 1991 Toyota 2ed p/u (sry just cant break these things) 1997 XR70 Honda 1991 Z50(FOR SALE) 1972 Z50 Honda 1970 SWB 350/knucklebuster "The adventure begins and I am confident that there will be no end".

06-07-2003, 11:24 AM	#5
Steven Sellers Registered User Join Date: Jan 2002 Location: North Carolina Posts: 692	Im sorry mine is actually facing toward the cab __________________ 2008 Buick Enclave(wifes new non wrecked) 1996 Jeep Cherokee 2002 2500HD 6.0L (traded) 1998 Jeep Grand Cherokee(wifes/wrecked) 1977 DJ5 postal jeep(mmm lots of fun) 1988 Toyota 2wd p/u(DD, blewup 199,000) 1991 Toyota 2ed p/u (sry just cant break these things) 1997 XR70 Honda 1991 Z50(FOR SALE) 1972 Z50 Honda 1970 SWB 350/knucklebuster "The adventure begins and I am confident that there will be no end".

06-07-2003, 03:09 PM	#6
Joesjunk Senior Member Join Date: May 2001 Location: Independence MO. Posts: 7,689	TRR is a 1971, 3:07 ratio, non-posi. __________________ 72 3/4t Custom Deluxe 402/auto 66k Original paint 71 3/4t 4x4 Custom Deluxe 10k original miles Original paint 71 3/4t Cheyenne 402 70k original paint 72 3/4t 4x4 Custom deluxe 72 3/4t 4x4 Custom deluxe 91k original paint 72 Cheyenne/30 Dually 69 Camaro SS396 4-speed 13 GMC 2500HD Duramax I bought new 05 Jeep Wrangler "Willys Edition" 12k miles (I bought new) 85 3/4 ton 4x4 Scottsdale 33k miles original paint 86 1 ton 4x4 SRW Silverado 454 restored 80 1 ton 4x4 SRW Silverado 9,434 original miles!! original paint 95 GMC 1 ton dually 4x4 my dad bought new 95 GMC 3/4 ton 4x4, regular cab 454, 31k original miles 2002 2500HD 4x4 regular cab 6.0L 67k miles 2002 2500HD 4x4 regular cab 8.1L 28k miles 2003 GMC 2500HD 4x4 regular cab Diesel 93k miles 67-72 Parts for sale

06-07-2003, 03:40 PM	#7
sgtjed What if? Join Date: Oct 2002 Location: Choctaw,Oklahoma Posts: 649	cool,that what i wanted thanks guys __________________ 2002 red extended cab Silverado 2002 Wheatland yellow Suburban

06-08-2003, 02:46 PM	#8
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	location location location ok .... need some more help on where those letters are located...is it between the u bolt and the drum or between the u bolt and the differential ?? i looked on the driver side ....30 years of dirt makes it hard to locate.... i want a good idea on loaction before i start cleaning to find these letters thanks a million __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.

06-08-2003, 02:51 PM	#9
sgtjed What if? Join Date: Oct 2002 Location: Choctaw,Oklahoma Posts: 649	i found mine to the left of the u-bolt on the pass tube,kinda almost to the top. __________________ 2002 red extended cab Silverado 2002 Wheatland yellow Suburban

06-08-2003, 03:13 PM	#10
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	is that while looking toward the back or front of the truck ??? __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.

06-08-2003, 04:02 PM	#11
sgtjed What if? Join Date: Oct 2002 Location: Choctaw,Oklahoma Posts: 649	from underneath looking toward the rear of the truck. the numbers are on the cab side of the rear end. the numbers are gonna be almost hard to see with out taking a wire prush to that area,as they were just stamped in with a hammer and stamp set. __________________ 2002 red extended cab Silverado 2002 Wheatland yellow Suburban

06-08-2003, 05:40 PM	#12
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	no luck yet .... i did find this NF3896838 on the passenger side differential housing.... i've cleaned that axle housing completely off with a brush and carb cleaner and no sight of any stamped T letters.... aarrrrgghhhh... i wanna know what gear ratio i have ... for sure ... its either 3.07 or 3.73 .... during light acceration in in 3rd by 30 mph with my turbo 350 trans .... but when i step on it hard on usuallybegin 3rd at 40 or 45 ..depending the quanity of foot applied help...i wish i had a tach so i could give you 60mph rpm figures peace __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.

06-08-2003, 09:14 PM	#13
Steven Sellers Registered User Join Date: Jan 2002 Location: North Carolina Posts: 692	Its on the passenger side of the truck between the diff and the ubolt on the tube. Mine faces toward you if you are laying in front of the rear pass tire looking back. These letters arenet much bigger than the letters that we are writing here. I had to take a wire brush to mine to find them __________________ 2008 Buick Enclave(wifes new non wrecked) 1996 Jeep Cherokee 2002 2500HD 6.0L (traded) 1998 Jeep Grand Cherokee(wifes/wrecked) 1977 DJ5 postal jeep(mmm lots of fun) 1988 Toyota 2wd p/u(DD, blewup 199,000) 1991 Toyota 2ed p/u (sry just cant break these things) 1997 XR70 Honda 1991 Z50(FOR SALE) 1972 Z50 Honda 1970 SWB 350/knucklebuster "The adventure begins and I am confident that there will be no end".



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