Rear end ID please. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**too much stuff** · 08-06-2011, 07:44 PM

Pretty sure i know the scoop, but would like a second or third opinion. Thanks.

**john** · 08-06-2011, 07:50 PM

4.11:1

71swb4x4 · 08-06-2011, 07:51 PM

Isn't that a 12 bolt with 4:11 gears?

37/9=4.11

Mike C · 08-06-2011, 07:53 PM

Coil spring 12 bolt from a '66 2 wheel drive 1/2 ton with 4.11 gears. With an open diff.

**too much stuff** · 08-06-2011, 07:56 PM

And non-posi, correct? Also, is this a bolt in for the 67-72 trucks with trailing arms?

71swb4x4 · 08-06-2011, 08:05 PM

As Mike C says not a posi. You would see springs of some type in the center, some styles use springs, some use flat metal bent into an "S" type shape.

**too much stuff** · 08-06-2011, 08:14 PM

Thanks for the fast replies. You all confirmed what i was afraid of... 4:11 open diff. This was in a 66 swb forestry truck with a nice list of options... Including posi... I rolled the dice and lost this time. The spid is on the 66 message board.
Eric

**leddzepp** · 08-06-2011, 09:54 PM

Every time I have come across a truck with posi listed on the spid, the rear end is either gone, or the carrier has been pulled and the rest of the guts are laying on the ground. Strange that it was pulled and the diff. cover bolted back on...must have been removed before it got to the yard.

**too much stuff** · 08-06-2011, 09:58 PM

Scott, the posi must have been removed ALONG time ago. The last plate was 88 and when i looked under the truck i could not tell that anything had been touched. The spid had posi on it and being a forestry truck, some one wrote on the dash to use posi additive... I just hoped it was still there.

**leddzepp** · 08-06-2011, 10:05 PM

Dang Eric, I would have rolled the dice too. Did you try to rotate the tires before you pulled it? I always do that, unless the drums are frozen or driveline prevents it (that happens a lot)

**too much stuff** · 08-06-2011, 10:12 PM

Quote:

Originally Posted by leddzepp

Dang Eric, I would have rolled the dice too. Did you try to rotate the tires before you pulled it? I always do that, unless the drums are frozen or driveline prevents it (that happens a lot)

No, the truck was sitting on the ground, it was 11:30, they close at noon. I barely had enough time to say cut it out for me. If i had more time i would have done that. While they were cutting it out, i was busy pulling 2 rims off another truck. (8.25x16.5 6 lug with the spring clips) plus my bonus was an NOS 66 pass rocker panel lying on the seat!

**leddzepp** · 08-06-2011, 10:30 PM

That rocker was the icing on the cake!

teeitup · 08-06-2011, 11:11 PM

I hate that when it happens Eric, I see on spid its a posi then get it home and it isn't, real frustrating, its happened a couple times to me I probably said the samething you did when you opened it up

**too much stuff** · 08-07-2011, 10:53 AM

Randy, there is only so much you can say...
Does anyone know if this is the same as 67-72? (bolt in)
Any ideas on a value? Without a posi, i am going to sell it probably. $150????

mcbassin · 08-07-2011, 12:30 PM

Sorry for my ignorance, but how do you guys know that its a 4:11 by the numbers on the ring gear? Is there a chart to refer to? Chevy manual?

harleyhouser · 08-07-2011, 12:59 PM

see the 9-37 on the ring gear, take 37 and divide by 9 = 4.11

**too much stuff** · 08-07-2011, 01:44 PM

Quote:

Originally Posted by harleyhouser

see the 9-37 on the ring gear, take 37 and divide by 9 = 4.11

That is correct. I believe that is the number of teeth on the ring gear and on the pinion.

08-06-2011, 07:44 PM	#1
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,712	Rear end ID please. Pretty sure i know the scoop, but would like a second or third opinion. Thanks. Attached Images __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

08-06-2011, 07:50 PM	#2
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Rear end ID please. 4.11:1 __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

08-06-2011, 07:51 PM	#3
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	Re: Rear end ID please. Isn't that a 12 bolt with 4:11 gears? 37/9=4.11 __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

08-06-2011, 07:53 PM	#4
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,715	Re: Rear end ID please. Coil spring 12 bolt from a '66 2 wheel drive 1/2 ton with 4.11 gears. With an open diff. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

08-06-2011, 07:56 PM	#5
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,712	Re: Rear end ID please. And non-posi, correct? Also, is this a bolt in for the 67-72 trucks with trailing arms? __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

08-06-2011, 08:05 PM	#6
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	Re: Rear end ID please. As Mike C says not a posi. You would see springs of some type in the center, some styles use springs, some use flat metal bent into an "S" type shape. __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

08-06-2011, 08:14 PM	#7
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,712	Re: Rear end ID please. Thanks for the fast replies. You all confirmed what i was afraid of... 4:11 open diff. This was in a 66 swb forestry truck with a nice list of options... Including posi... I rolled the dice and lost this time. The spid is on the 66 message board. Eric __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

08-06-2011, 09:54 PM	#8
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 19,995	Re: Rear end ID please. Every time I have come across a truck with posi listed on the spid, the rear end is either gone, or the carrier has been pulled and the rest of the guts are laying on the ground. Strange that it was pulled and the diff. cover bolted back on...must have been removed before it got to the yard. __________________ 1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man

08-06-2011, 09:58 PM	#9
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,712	Re: Rear end ID please. Scott, the posi must have been removed ALONG time ago. The last plate was 88 and when i looked under the truck i could not tell that anything had been touched. The spid had posi on it and being a forestry truck, some one wrote on the dash to use posi additive... I just hoped it was still there. __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

08-06-2011, 10:05 PM	#10
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 19,995	Re: Rear end ID please. Dang Eric, I would have rolled the dice too. Did you try to rotate the tires before you pulled it? I always do that, unless the drums are frozen or driveline prevents it (that happens a lot) __________________ 1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man

08-06-2011, 10:30 PM	#12
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 19,995	Re: Rear end ID please. That rocker was the icing on the cake! __________________ 1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man

08-06-2011, 11:11 PM	#13
teeitup Just like to part out trucks!! Join Date: Nov 2001 Location: Meriden, Ks-North of Topeka 10 miles Posts: 27,396	Re: Rear end ID please. I hate that when it happens Eric, I see on spid its a posi then get it home and it isn't, real frustrating, its happened a couple times to me I probably said the samething you did when you opened it up __________________ 67 Chev swb stepside 4x4 283 4 speed SOLD 72 blazer 4x4 4 speed Cheyenne 72 GMC swb 4x4 fleet 4 speed, original paint 1958 Cameo (one of 1405 built, it was my dads) 2020 chevy Apex 4x4 crew cab 1969 Z28 with the 302 1980 chevy swb 4x4 1964 chevell Malibu SS 1976 K20, sold new originally out of my dads chevy dealership Members that I've met, over 200 probably closer to 300 in the 12 years I've been on this site, everyone I met "It was a pleasure"

08-07-2011, 10:53 AM	#14
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,712	Re: Rear end ID please. Randy, there is only so much you can say... Does anyone know if this is the same as 67-72? (bolt in) Any ideas on a value? Without a posi, i am going to sell it probably. $150???? __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

08-07-2011, 12:30 PM	#15
mcbassin Still Learning Join Date: Jul 2009 Location: Central Oklahoma Posts: 10,108	Re: Rear end ID please. Sorry for my ignorance, but how do you guys know that its a 4:11 by the numbers on the ring gear? Is there a chart to refer to? Chevy manual? __________________ Mike "69 Short Wide" My Project 86 Silverado Landen's Project Instagram: @mcbassin My Website C/10 Club Oklahoma Facebook Group

08-07-2011, 12:59 PM	#16
harleyhouser Registered User Join Date: Jul 2011 Location: valliant oklahoma Posts: 97	Re: Rear end ID please. see the 9-37 on the ring gear, take 37 and divide by 9 = 4.11



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