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 > General Truck Forums > All 4x4 Tech & Off Roading

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 04-03-2011, 09:43 PM   #1
RShaips
Senior Member
 
Join Date: Jun 2002
Location: Augusta Missouri
Posts: 804
What gear ratio is this?

I bought a rear and front axle assembly from a guy and it was supposed to be from a 79 1/2 ton with 3.73 gears. I checked the ratio by spinning one tire one revolution and times it by 2 and the front and back came out as 3.73, at least that's what I thought! Well I take the rear apart and the ring gear is stamped 10.34. And i counted them and that's what it is. 3.40 gears? I have heard of 3.42 but 3.40?
RShaips is offline   Reply With Quote
Old 04-03-2011, 10:43 PM   #2
69CSTDawg
Registered User
 
69CSTDawg's Avatar
 
Join Date: Dec 2010
Location: Conyers,Ga
Posts: 24
Re: What gear ratio is this?

its most likely 3.42
69CSTDawg is offline   Reply With Quote
Old 04-04-2011, 08:31 AM   #3
rayfinseats
Registered User
 
Join Date: Dec 2010
Location: sioux city, iowa
Posts: 621
Re: What gear ratio is this?

10 34 is 3.2. You sure you got the right numbers off the ring gear? Put a mark on the tire and count how many times the pinion turns in one revolution of tire. What's this times two stuff for???? I have 2.73's in my 83. Which rear end is it? 10-bolt? Dana 60? 14 bolt?

3.4 what the F was I thinking?

Last edited by rayfinseats; 04-08-2011 at 12:10 AM.
rayfinseats is offline   Reply With Quote
Old 04-04-2011, 03:53 PM   #4
argonaut
Senior Member
 
argonaut's Avatar
 
Join Date: Aug 2008
Location: Long Beach, CA
Posts: 1,744
Re: What gear ratio is this?

34 teeth on the ring / 10 teeth on the pinion = 3.4:1 ratio
__________________
Jason M. @argonaut62

1972 K5 Blazer CST, Turquoise
1966 K20 Short Fleet Pickup, Big Ugly
1964 C10 Short Fleet, Gertrude

2002 Porsche 911 Turbo
2001 Porsche 911 Carrera
1996 Ford Bronco XLT

2008 Honda CBR1000RR
2005 Honda RC51
1981 Honda CB750C


No dis-assemble Johnny Five! No dis-assemble!
argonaut is offline   Reply With Quote
Old 04-07-2011, 11:35 PM   #5
68chevyfuelie
Registered User
 
68chevyfuelie's Avatar
 
Join Date: Mar 2008
Location: Kitchener, Ontario
Posts: 487
Re: What gear ratio is this?

12 bolt chevy rears were a 3.40 ratio, they didn't offer a 3.42 12 bolt ratio.
68chevyfuelie 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 02:53 AM.


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