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 04-11-2005, 03:16 PM   #1
cwilkie
Chance
 
cwilkie's Avatar
 
Join Date: Sep 2001
Location: Belcourt ,ND, USA
Posts: 750
Gear Ratio

What is the gear ratio in a 71-72 rear end? I had my gears switched when I came across that rear end since the gears in my 1968 were so low gear. However, I forgot the gear ratio and I have to know because I want my speedo to be correct.
__________________
1968 Chevrolet Stepside
BB 396 w/TH400

1972 Chevrolet 3/4 Ton 4x4
BB 496 w/TH400
cwilkie is offline   Reply With Quote
Old 04-11-2005, 03:28 PM   #2
CHEVY & GMC FOREVER
Registered User
 
Join Date: Nov 2004
Location: New Lenox,IL
Posts: 306
Not enough info, but if I had to guess I would say maybe 3.43, 3.73, or maybe even 4.11, hope this helps.
__________________
1985 Chevrolet C-30 454 1-TON Dooley

1969 CHEVROLET CST-10 PICK-UP
Good memories

1999 Chevrolet Z71 Ext. cab 5.7L
Good Memories


With a quart of oil, and a gallon of gas, she won't let no other car pass!!!.

& FOREVER
CHEVY & GMC FOREVER is offline   Reply With Quote
Old 04-11-2005, 03:28 PM   #3
'70_402
Senior Member
 
'70_402's Avatar
 
Join Date: Dec 2003
Location: Pampa, Texas
Posts: 1,553
There Was Not One Gear Ratio In Those Years...you Either Had 3:08,3:42,3:73,or 4:11.... Search The Board Here For Some Threads On How To Figure Out What Ratio You Have..

Last edited by '70_402; 04-11-2005 at 03:29 PM.
'70_402 is offline   Reply With Quote
Old 04-11-2005, 04:20 PM   #4
farside847
Registered User
 
farside847's Avatar
 
Join Date: Feb 2005
Location: Bay Area, California
Posts: 995
Josh answered this for me earlier:

If it's a stock 307/3spd they all got 3.73s unless ordered otherwise, 350s got 3.07, big blocks got 3.54 and all sixes got 3.73.
__________________
1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree
farside847 is offline   Reply With Quote
Old 04-11-2005, 09:21 PM   #5
Longhorn Man
its all about the +6 inches
 
Longhorn Man's Avatar
 
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
farside, those gears you listed are fairly acurate, but only for 1/2 ton trucks, and all are as base equipment. With certian exceptions (like the 4.10 to a big block) you could get any ratio with any engine tranny combo...but what you listed is fairly acurate for base equipment.
In all reality, it is probably a 3.07 gear. However, i always recomend doing a tooth count on the gears becouse some one could have installed a 3.42 (never factory installed) and the oil probably needs chainged anyways.
Longhorn Man is offline   Reply With Quote
Old 04-11-2005, 11:44 PM   #6
JodysTransmissions
Registered User
 
JodysTransmissions's Avatar
 
Join Date: Apr 2005
Location: Reading, PA
Posts: 12
cwilkie:

Most any transmission shop should be able to help you with a speedometer calibration. We do this all the time for customers. Any gear ratio or tire diameter change will effect your speedometer/odometer reading.

Regards, Jody
JodysTransmissions 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 07:27 AM.


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