The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1960 - 1966 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 07-05-2019, 09:31 AM   #1
pheengurs
Registered User
 
pheengurs's Avatar
 
Join Date: Jul 2006
Location: Calgary, Alberta, Canada
Posts: 127
corp 12 bolt axle shaft length needed to purchase new axles

I need the stock length of the 6 lug 30 spline corp 12 bolt axle shaft length in order to purchase new axles...

I'm having trouble sourcing such specific info... and it's needed in order to purchase shafts...

any source that sells 6 lug axles seems to have around 3 different lengths of axle shafts ranging from 30-33 inches ...

anyone with a corp 12 bolt, 6 lug, 30 spline out there replace your axles? what lengths and company and strength type did you end up with?

thanks!
__________________
1964 K10 shortbox Stepside
383 sbc stroker under vortec heads
sm420 trans / t221 tcase / corp 10 front axle / corp 12 rear axle / 3.73 gears
rolling on 33x12x15 tires on 6 lug rims.
pheengurs is offline   Reply With Quote
Old 07-05-2019, 12:46 PM   #2
Clyde65
1965 Chevy C10, 2005 4.8L/4l60
 
Clyde65's Avatar
 
Join Date: Aug 2004
Location: DFW Texas
Posts: 8,209
Re: corp 12 bolt axle shaft length needed to purchase new axles

Call Summit Racing

https://www.summitracing.com/parts/c...CABEgJ69_D_BwE
__________________
Clyde65

Rebuild of Clyde
http://67-72chevytrucks.com/vboard/s...84#post8338184

69 Aristocrat Lo Liner build
http://67-72chevytrucks.com/vboard/s...84#post7561684



support our troops!
Clyde65 is offline   Reply With Quote
Old 07-05-2019, 03:10 PM   #3
61K10
Registered User
 
61K10's Avatar
 
Join Date: Feb 2012
Location: pleasant valley--placerville ca
Posts: 2,950
Re: corp 12 bolt axle shaft length needed to purchase new axles

stock k10 12bolt? staying with 6 lug?
__________________
1961 chevy K10

my build is------------61K10 build
61K10 is offline   Reply With Quote
Old 07-05-2019, 08:13 PM   #4
pheengurs
Registered User
 
pheengurs's Avatar
 
Join Date: Jul 2006
Location: Calgary, Alberta, Canada
Posts: 127
Re: corp 12 bolt axle shaft length needed to purchase new axles

thanks Clyde, the one you listed is for a C10, and is 5 bolt, but you are wise sir!

summit is listing the axle lengths on those and 'more' correct versions I'm looking for...

seems according to summit, the magic number is 30-3/4" ... I'm just not certain I believe it, and I don't feel like wasting gear oil trying to find out for sure, but perhaps that will end up being the case...


mine is a version 4 chev 12 bolt, and pretty darn sure its stock to my truck. I don't have all the data and numbers with me, but its a stock 3.73 geared truck, and I'm sure I matched the stamping on the axle... have it all written down somewhere...


and yeah 61K10, I'm sticking with the 6 bolt. For me I get no benefit from a 5 lug conversion. My other truck is an 07 canyon, runs the same 6 bolt pattern... I can swap rims and tires between my 64 and 07... how cool is that?

when I do get the new axles, I'll upgrade the lug size to the big fat ARP long studs (1/2"???) and she's also getting the old lift blocks removed and springs sized large enuf to compensate for that.


mainly I'm asking the community is because I am not trusting what I'm finding online... I've seen ranges of 30-1/2" to over 33" and when I dig further I see websites mixing sizes between a year range of 60-87, and 4 different carrier types for the chev 12 bolt...

currently, only yukon seems to list YA G3893605 as being the 'correct' length at 30-3/4" ... I'd like to somehow confirm that...

I've searched the site and the sticky's and haven't found what I need thus far... hoping y'all can knock it out of the park for me...
__________________
1964 K10 shortbox Stepside
383 sbc stroker under vortec heads
sm420 trans / t221 tcase / corp 10 front axle / corp 12 rear axle / 3.73 gears
rolling on 33x12x15 tires on 6 lug rims.

Last edited by pheengurs; 07-05-2019 at 08:40 PM.
pheengurs is offline   Reply With Quote
Old 07-05-2019, 11:23 PM   #5
mongocanfly
Senior Member
 
Join Date: May 2015
Location: Alabama
Posts: 8,819
Re: corp 12 bolt axle shaft length needed to purchase new axles

I'm thinking the best thing would be pull your axle and measure....then there wont be any question
You can catch your dope in a clean container and reuse it if it's still fresh...
__________________
Mongo...aka Greg

1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598
Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334
Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563
2013 GMC Z71..daily driver
mongocanfly is offline   Reply With Quote
Old 07-06-2019, 12:07 AM   #6
Captainfab
60-66 Nut

 
Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 22,081
Re: corp 12 bolt axle shaft length needed to purchase new axles

Starting with the axle flange to axle flange width of 62" for the '60 to early '70 differentials, subtracting the 1" diameter center pin and dividing by 2, I come up with 30.5" for a axle length. Without the correct length axles, your rear disc conversion will not line up.
__________________
Power Steering Box Adapter Plates For Sale HERE
Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE
Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE
Hydroboost Mounting Plates HERE
Captainfab is offline   Reply With Quote
Old 07-06-2019, 09:41 AM   #7
VictoriaHardware
Senior Member
 
VictoriaHardware's Avatar
 
Join Date: Nov 2012
Location: Southeast Michigan
Posts: 518
Re: corp 12 bolt axle shaft length needed to purchase new axles

30.5" is correct. I purchased new axles from Moser for my '66 C10 and they did fit together as planned.

https://www.moserengineering.com/196...spline-30.item

They can also custom build them with different wheel studs, bolt centers, or 5-lug
VictoriaHardware is offline   Reply With Quote
Old 07-07-2019, 05:26 PM   #8
pheengurs
Registered User
 
pheengurs's Avatar
 
Join Date: Jul 2006
Location: Calgary, Alberta, Canada
Posts: 127
Re: corp 12 bolt axle shaft length needed to purchase new axles

well thanks for all the help identifying this folks!

axle length of 30-1/2 inches seems to be the consensus. Though it seems 30-3/4 inches are the only ones I can get my hands on, up here in Canada. Very frustrating...


I'm broke out the tape measure and trouble light and used CaptainFab's specs there... a rough 62" length was eyeballed from measuring under the truck with wheels still on, from outer brake drum to drum... ish... best I can do right now.

the reason I don't want to simply drop the fluid and pull the axles for an accurate measurement as I've just recently put a detroit tru-trac in, and am still during the new ring & pinion breakin 500 mile term... got 400 miles more to go, which for me is difficult as the specs say avoid highway miles. driving in town here in Calgary, with this old girl's currently sketchy brake setup, is stressful, the idiot factor on the roads is rather high here...

(thanks again CaptainFab for making those rear disc and brake booster bracketry, I'm eagerly awaiting their arrival so that brake upgrade project can get underway!)

and thanks everyone for the speedy and useful and informative responses that I always see here on the forum!
__________________
1964 K10 shortbox Stepside
383 sbc stroker under vortec heads
sm420 trans / t221 tcase / corp 10 front axle / corp 12 rear axle / 3.73 gears
rolling on 33x12x15 tires on 6 lug rims.
pheengurs is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 11:12 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com