2wd 14 bolt rear axle fit on 4wd? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ReeseBobby · 05-06-2013, 09:04 PM

Hi guys,

I'm trying to get my stuff together for my axle swap on my 1970 C20. I've got a line on a 14 bolt rear axle. It came from a 73' 3/4 ton, but the perches were adjusted and put onto a 72' 2WD 3/4 ton.

My questions are: Is there any difference in a 2WD rear vs a 4WD? And if the perches have been adjusted to fit on a 72' 2WD, will I need to do anything besides bolt it in on my 70' 4WD? I have a leaf spring truck and that's what it came from. Anything else I'm missing? Thanks!

b454rat · 05-06-2013, 09:07 PM

For the most part they are the same. I did one to a truck years ago, only thing I remember were the shock mounts were a little shorter, therefor the shocks would hit the axle tube. Not a big deal really, I just put a small dent on the shock tube. Other than that, I can't think of a difference.

Chevy1TonFun · 05-06-2013, 11:00 PM

my axle came out of a 2wd truck. Bolted right up.

**special-K** · 05-08-2013, 06:22 AM

So,a 67-72 C/20 rear will bolt directly into a same year K/20?

b454rat · 05-08-2013, 06:00 PM

Didn't the 2 wheelers have coil springs??

**special-K** · 05-08-2013, 07:17 PM

They had either coils or leafs. A Dana 60 from a '72 C/20 will not bolt up to a '72 K/20 frame to the best of my knowledge.

b454rat · 05-08-2013, 07:45 PM

I've never owned a 67-72, but when I had my '62 4wd burb I was looking for axles for it, I looked at those styles and thought that the rear was 40.5" spring perch, which is the same as 73-up 1 tons.

Mike C · 05-08-2013, 09:02 PM

67-72 2x4 trucks have a 42.5" spring center. The 4x4 has a 40.5". The 73-87 2 and 4 wheel trucks have 42.5" spring centers in half and 3/4 ton variants. K30 trucks have 40.5" spring centers. Shock mounts are different between all.

**special-K** · 05-09-2013, 09:01 AM

Thanks Mike for the thorough info. I'm sure this helps the OP better than my "...to the best of my knowledge". I'm sure this helps us all. Gotta start writing this stuff down!

ReeseBobby · 05-09-2013, 08:33 PM

Quote:

Originally Posted by Mike C

67-72 2x4 trucks have a 42.5" spring center. The 4x4 has a 40.5". The 73-87 2 and 4 wheel trucks have 42.5" spring centers in half and 3/4 ton variants. K30 trucks have 40.5" spring centers. Shock mounts are different between all.

This is exactly what I was looking for. Thanks a lot!

Mike C · 05-10-2013, 08:21 PM

I'm glad I have found a place where what most people consider "useless" information is actually useful!

**special-K** · 05-11-2013, 09:44 AM

No,the info is very useful...no doubt! It's the person giving it I'm not so sure about. Huh? Oh damn!! Gotta go!!

Mike C · 05-11-2013, 08:22 PM

LOL. We need a like button. I'd like that.

05-06-2013, 09:04 PM	#1
ReeseBobby Registered User Join Date: Apr 2013 Location: Portland, OR Posts: 38	2wd 14 bolt rear axle fit on 4wd? Hi guys, I'm trying to get my stuff together for my axle swap on my 1970 C20. I've got a line on a 14 bolt rear axle. It came from a 73' 3/4 ton, but the perches were adjusted and put onto a 72' 2WD 3/4 ton. My questions are: Is there any difference in a 2WD rear vs a 4WD? And if the perches have been adjusted to fit on a 72' 2WD, will I need to do anything besides bolt it in on my 70' 4WD? I have a leaf spring truck and that's what it came from. Anything else I'm missing? Thanks!

05-06-2013, 09:07 PM	#2
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,469	Re: 2wd 14 bolt rear axle fit on 4wd? For the most part they are the same. I did one to a truck years ago, only thing I remember were the shock mounts were a little shorter, therefor the shocks would hit the axle tube. Not a big deal really, I just put a small dent on the shock tube. Other than that, I can't think of a difference. __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon 350/4L60 6" SAS

05-06-2013, 11:00 PM	#3
Chevy1TonFun Grease Monkey Join Date: Oct 2007 Location: Fresno CA Posts: 750	Re: 2wd 14 bolt rear axle fit on 4wd? my axle came out of a 2wd truck. Bolted right up. __________________ Tow Rig: 2012 Chevy 2500HD CCSB LTZ Z71 4x4 Duramax Ultimate Offroad Build: 1978 Chevy Silverado K30 Crewcab Build Link http://67-72chevytrucks.com/vboard/s...d.php?t=654053 Mud Truck: 1972 Chevy Cheyenne K30 4x4, 468/400/205, D60/D70HD, 18" Custom Lift, 17x39" IROKs FOR SALE http://67-72chevytrucks.com/vboard/c...ton-4x4&cat=12

05-08-2013, 06:22 AM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 2wd 14 bolt rear axle fit on 4wd? So,a 67-72 C/20 rear will bolt directly into a same year K/20? __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

05-08-2013, 06:00 PM	#5
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,469	Re: 2wd 14 bolt rear axle fit on 4wd? Didn't the 2 wheelers have coil springs?? __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon 350/4L60 6" SAS

05-08-2013, 07:17 PM	#6
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 2wd 14 bolt rear axle fit on 4wd? They had either coils or leafs. A Dana 60 from a '72 C/20 will not bolt up to a '72 K/20 frame to the best of my knowledge. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

05-08-2013, 07:45 PM	#7
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,469	Re: 2wd 14 bolt rear axle fit on 4wd? I've never owned a 67-72, but when I had my '62 4wd burb I was looking for axles for it, I looked at those styles and thought that the rear was 40.5" spring perch, which is the same as 73-up 1 tons. __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon 350/4L60 6" SAS

05-08-2013, 09:02 PM	#8
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,728	Re: 2wd 14 bolt rear axle fit on 4wd? 67-72 2x4 trucks have a 42.5" spring center. The 4x4 has a 40.5". The 73-87 2 and 4 wheel trucks have 42.5" spring centers in half and 3/4 ton variants. K30 trucks have 40.5" spring centers. Shock mounts are different between all. __________________ 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

05-09-2013, 09:01 AM	#9
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 2wd 14 bolt rear axle fit on 4wd? Thanks Mike for the thorough info. I'm sure this helps the OP better than my "...to the best of my knowledge". I'm sure this helps us all. Gotta start writing this stuff down! __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

05-10-2013, 08:21 PM	#11
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,728	Re: 2wd 14 bolt rear axle fit on 4wd? I'm glad I have found a place where what most people consider "useless" information is actually useful! __________________ 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

05-11-2013, 09:44 AM	#12
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 2wd 14 bolt rear axle fit on 4wd? No,the info is very useful...no doubt! It's the person giving it I'm not so sure about. Huh? Oh damn!! Gotta go!! __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

05-11-2013, 08:22 PM	#13
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,728	Re: 2wd 14 bolt rear axle fit on 4wd? LOL. We need a like button. I'd like that. __________________ 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

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