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 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 02-20-2018, 11:28 PM   #1
Baker72chevy
Registered User
 
Join Date: Apr 2013
Location: North pickens SC
Posts: 294
67-72 posi and gears

What do you have to do to change out a posi an gear set out of a 68 model to a 72 rear end do it have to be reset up
Baker72chevy is offline   Reply With Quote
Old 02-21-2018, 01:26 PM   #2
Zone47
Registered User
 
Zone47's Avatar
 
Join Date: Sep 2014
Location: Richfield, Oh
Posts: 112
Re: 67-72 posi and gears

Quote:
Originally Posted by Baker72chevy View Post
What do you have to do to change out a posi an gear set out of a 68 model to a 72 rear end do it have to be reset up
I'm not sure but I think the series of carrier and housing has to match? (3 series, 4 series) ?? Somebody chime in if I'm wrong.

And yeah, you have to have the lash set right and I have no idea how to do that.

Sorry I wasn't much help.
Zone47 is offline   Reply With Quote
Old 02-21-2018, 01:44 PM   #3
Bigdav160
Registered User
 
Bigdav160's Avatar
 
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
Re: 67-72 posi and gears

As a general rule the shim under the pinion bearing stays with the housing. It determines the pinion depth. You need a press and a bearing separator.

You'll need a new crush sleeve, an impact and a small dial or beam torque wrench to set the turning torque on the pinion.

You going to need a dial indicator with a selection of shims to set the backlash.
__________________
My Classics:
'72 K20 Suburban + '65 Dodge Town Wagon
'72 Corvette Roadster +'67 Corvette Roadster
'73 Z-28 Camaro
'63 Ford SWB Uni Pickup
'50 Ford Coupe
Bigdav160 is offline   Reply With Quote
Old 02-21-2018, 04:54 PM   #4
applebmw
Registered User
 
Join Date: Jul 2017
Location: greenville
Posts: 88
Re: 67-72 posi and gears

3 series is up to 3.42, 4 series on up, I installed ($400)eaton posi off amazon with my 307 rear end, the 4 series are little cheaper I think. They sent great instructions on how to shim carrier correct, and youtube videos, was pretty simple. take your time.
applebmw is offline   Reply With Quote
Old 02-21-2018, 04:57 PM   #5
applebmw
Registered User
 
Join Date: Jul 2017
Location: greenville
Posts: 88
Re: 67-72 posi and gears

Correct if your changing ring and pinion, if only installing posi track you only need heat to swell carrier bears for install. Or run them down to machine shop have pressed on. I heated mine in oven couple hrs, drove on easy.
applebmw is offline   Reply With Quote
Old 02-21-2018, 05:31 PM   #6
Keystone_Hate
Registered User
 
Join Date: Apr 2017
Location: Colorado Springs
Posts: 129
Re: 67-72 posi and gears

I try to do everything myself, but there are certain things like driveshafts, transmissions and rearends that I leave to the professionals. I'm not saying it can't be done in your garage, but it requires some special tools and some taking apart and putting together to get things perfect. And if it's not perfect, it comes apart and usually takes a lot of surrounding parts with it. I firmly believe that paying the money to have certain things done at a shop is worth the peace of mind in the long run. Not to mention any good shop will have a warranty with their work. Again, if you do it wrong, it's all on your dime.

Just my .02
Keystone_Hate is offline   Reply With Quote
Old 02-21-2018, 07:43 PM   #7
Baker72chevy
Registered User
 
Join Date: Apr 2013
Location: North pickens SC
Posts: 294
Re: 67-72 posi and gears

Thanks for all the input
Baker72chevy is offline   Reply With Quote
Old 02-21-2018, 11:00 PM   #8
Baker72chevy
Registered User
 
Join Date: Apr 2013
Location: North pickens SC
Posts: 294
Re: 67-72 posi and gears

Is this a 3 are 4 series
Attached Images
 
Baker72chevy is offline   Reply With Quote
Old 02-23-2018, 01:17 PM   #9
Baker72chevy
Registered User
 
Join Date: Apr 2013
Location: North pickens SC
Posts: 294
Re: 67-72 posi and gears

Getting rear end changed over this week end
Baker72chevy is offline   Reply With Quote
Reply

Bookmarks


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 09:07 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com