The 1947 - Present Chevrolet & GMC Truck Message Board Network

The 1947 - Present Chevrolet & GMC Truck Message Board Network (https://67-72chevytrucks.com/vboard/index.php)
-   The 1967 - 1972 Chevrolet & GMC Pickups Message Board (https://67-72chevytrucks.com/vboard/forumdisplay.php?f=3)
-   -   Rearend question (https://67-72chevytrucks.com/vboard/showthread.php?t=543512)

Harpie 09-17-2012 07:42 PM

Rearend question
 
Ok so pulled the rearend out of my parts truck. It's a 12 bolt posi the old man I got it from thought it was a 373 but it did not say that on the spid. So it being a 350 auto truck c10 I figured 3.07 so before I took it out I did the ol mark the tire and turn it and count how many turns it takes to make one rotation. It was 3 1/4 with would be 3.55 so does this sound correct? I guess I just need to crack it open and take a look.
Posted via Mobile Device

SS Tim 09-17-2012 08:02 PM

Re: Rearend question
 
Showing 3.07 as the standard ratio for that powertrain with 3.73 or 4.11 as optional. Probably a 3.07. If it is loose pulling the cover, inspecting and cleaning is always a good idea.

Harpie 09-17-2012 08:37 PM

Re: Rearend question
 
That's what I figured it was but I will get it cleaned up and tear it all down and take a look got a set of 3.73s for it since I'll be running a 4L80E hate for it to be a dog in overdrive. And thank ya sir for the reply always enjoy your post.
Posted via Mobile Device

DesertCat 09-17-2012 10:14 PM

Re: Rearend question
 
Quote:

Originally Posted by Harpie (Post 5598045)
That's what I figured it was but I will get it cleaned up and tear it all down and take a look got a set of 3.73s for it since I'll be running a 4L80E hate for it to be a dog in overdrive. And thank ya sir for the reply always enjoy your post.
Posted via Mobile Device

Hang on a sec... if it is indeed a 3.07 Eaton unit the 3.73's won't work in it unless they are Richmond gears meant to be used in the 3 series posi.

3.73 and numerically higher use a 4 series posi unit. You might want to look into that before unpacking your new gears. ;) Good luck!


All times are GMT -4. The time now is 01:13 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2025, vBulletin Solutions Inc.
Copyright 1997-2025 67-72chevytrucks.com