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 05-15-2018, 12:59 AM   #26
leddzepp
Moderator

 
leddzepp's Avatar
 
Join Date: May 2007
Location: Southern Cal
Posts: 17,927
Re: What differential rear end do I have???

You have a 3.07 open diff. Non-posi.

43/14 = 3.07

I zoomed in on the numbers.
__________________
1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed.

1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck.


RIP ElJay
leddzepp is offline   Reply With Quote
Old 05-15-2018, 09:16 AM   #27
hotwls13
Registered User
 
Join Date: Mar 2018
Location: Bakersfield, CA
Posts: 144
Re: What differential rear end do I have???

Quote:
Originally Posted by leddzepp View Post
You have a 3.07 open diff. Non-posi.

43/14 = 3.07

I zoomed in on the numbers.
Sweet thanks! I wasn't sure where to lookup the numbers. Any idea what the rest of it means?

So 3.07 is gonna be best possible mileage correct? I have a stock 350/350 with edelbrock intake/carb, headers, HD radiator.

My plans for this truck is get it driving/stopping 100%. It will be a weekend driver, trips to the dump, home depot etc. With the occasional (maybe 3-4 times a year) trailer pull of another 67-72 GM truck on uhaul trailer. I'm gonna add a curt class 4 hitch and a brake controller.
hotwls13 is offline   Reply With Quote
Old 05-15-2018, 09:07 PM   #28
hotwls13
Registered User
 
Join Date: Mar 2018
Location: Bakersfield, CA
Posts: 144
Re: What differential rear end do I have???

Ugh!! Leaking!! I knew that diff cover was gonna be a problem.

Should I just order a new chrome one or try to fix this one?? Or load up on the RTV?? I know I'm gonna have to pop the cover off again, drain the oil (do I try to recapture it or buy 2 more quarts?), get a new gasket etc etc.
Attached Images
 
hotwls13 is offline   Reply With Quote
Old 05-15-2018, 10:07 PM   #29
leddzepp
Moderator

 
leddzepp's Avatar
 
Join Date: May 2007
Location: Southern Cal
Posts: 17,927
Re: What differential rear end do I have???

If you get a new chrome one, be sure to lightly scuff the mounting surface to give it some grip. The longer number preceding the other two numbers is the part number (begins with 3). A weekend driver with light hauling and trips to the dump is fine. I have 3.07 in my 68 and that is exactly what I use it for.
__________________
1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed.

1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck.


RIP ElJay
leddzepp is offline   Reply With Quote
Old 05-16-2018, 10:35 AM   #30
hotwls13
Registered User
 
Join Date: Mar 2018
Location: Bakersfield, CA
Posts: 144
Re: What differential rear end do I have???

I have this coming tomorrow:

https://www.oreillyauto.com/detail/b...r/9894/4514825

Do I use the gasket that comes with it, get a fel-pro, or get green RTV?? With the metal brake line in the way, I could see how a line of RTV would be a pain trying to get the cover on under the brake line.

As far as scuffing the mounting surface, will a red scotchbrite pad work or should it be more like 80grit?

Torque is 20lbs, got that.

I'm gonna be an additional $49 for the cover kit, an additional $16 for 2 more quarts of gear oil and possibly another gasket and more permatex (I used ultra black I had lightly on the felpro).

I just don't want to do this again. :/
hotwls13 is offline   Reply With Quote
Old 05-16-2018, 02:32 PM   #31
Stocker
20' Daredevil (Ret)
 
Stocker's Avatar
 
Join Date: May 2003
Location: Jefferson State
Posts: 10,339
Re: What differential rear end do I have???

Quote:
Originally Posted by hotwls13 View Post
Do I use the gasket that comes with it, get a fel-pro, or get green RTV??
I would use the gasket that comes with it (get a Felpro if it gives you peace of mind), and coat all surfaces with the stuff I posted in post #14. It's the best I have found to seal against gear oil leakage.
__________________
- Mike -

1972 K20 LWB 350/350/205

RIP El Jay
Stocker is online now   Reply With Quote
Old 05-16-2018, 06:04 PM   #32
Steeveedee
Registered User
 
Steeveedee's Avatar
 
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 1,405
Re: What differential rear end do I have???

Quote:
Originally Posted by hotwls13 View Post
found it thanks. Page 646.

So I have a Dana 60??
Sorry! I wasn't even drinking! Glad you got it straightened out.
__________________
'70 Chevy 3/4T Longhorn CST 400/400/3.54 Custom Camper

"Orange Acres"
Steeveedee 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 02:08 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com