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 10-07-2014, 11:03 AM   #1
pointbreak
Registered User
 
pointbreak's Avatar
 
Join Date: Jun 2014
Location: Van island BC
Posts: 41
68 GMC rearend

OK, I'm sure this has been covered in here somewhere but I'm gonna throw this out there anyways.
I have a 68 GMC c10. With a 307 that's been rebuilt, and the granny 4 SPD. I'm not sure about the gear ratio all I know is that when I'm going 65 mph its a little loud. If I push it to 75 the world is ending!
It is the camper special with coil springs and posi track rear end. Does anyone wanna hazard a guess at the rear end. The 307 is also original. Its my daily driver so I would like to make it more highway friendly. I'm at work in camp for a few weeks now. So I'll pull the cover when I get home. Anyone have any suggestions as to what ratio I should have.
pointbreak is offline   Reply With Quote
Old 10-07-2014, 11:36 AM   #2
sc_frontier
Registered User
 
sc_frontier's Avatar
 
Join Date: Jul 2013
Location: Sherman, Tx
Posts: 16
Re: 68 GMC rearend

Mine would roar on the highway. I had pitting (rust) on my pinion bearings from sitting so long. After a rebuild, it is very quiet.
__________________
SC
sc_frontier is offline   Reply With Quote
Old 10-07-2014, 12:10 PM   #3
69worktruck
Registered User
 
Join Date: Oct 2014
Location: Daphne, AL
Posts: 10
Re: 68 GMC rearend

This may help:

http://www.differentials.com/technic...identification

http://www.how-to-build-hotrods.com/gear-ratio.html
69worktruck is offline   Reply With Quote
Old 10-07-2014, 01:12 PM   #4
pointbreak
Registered User
 
pointbreak's Avatar
 
Join Date: Jun 2014
Location: Van island BC
Posts: 41
Re: 68 GMC rearend

That helped ur revving? I'm doing like 2800 to 3000 rpms at 65 mph
pointbreak is offline   Reply With Quote
Old 10-07-2014, 01:16 PM   #5
pointbreak
Registered User
 
pointbreak's Avatar
 
Join Date: Jun 2014
Location: Van island BC
Posts: 41
Re: 68 GMC rearend

Thanks for the info!
pointbreak 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 06:02 AM.


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