Rear axle switch - Impala Tech
Transmission & Driveline Transmissions & Differentials

 2Likes
  • 1 Post By jayoldschool
  • 1 Post By jayoldschool
LinkBack Thread Tools
post #1 of 6 (permalink) Unread 11-20-2019, 11:46 AM Thread Starter
 
 
Join Date: Sep 2019
Posts: 13
 
Rear axle switch

Just curious if its feasible to swap in a rear axle from a 73 impala into my 66 2dr hardtop. Have a lead on one real close that has the gears im looking for. Im swaping out an axle that the PO put in from a much newer car(bigger bolt pattern forcing to run 2 diff lug patterns). Just wondering how much its different dimensional and how much fab work would have to do to make it work. Guy only wants $125 for a posi 10 bolt. Also, im building an engine projected for 350-400 hp, just street, no track use. Thank you!
jmiller1119 is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Unread 11-20-2019, 12:45 PM
Moderator
 
Join Date: Jan 2006
Posts: 12,556
 
Quote:
Originally Posted by jmiller1119 View Post
Just curious if its feasible to swap in a rear axle from a 73 impala into my 66 2dr hardtop. Have a lead on one real close that has the gears im looking for. Im swaping out an axle that the PO put in from a much newer car(bigger bolt pattern forcing to run 2 diff lug patterns). Just wondering how much its different dimensional and how much fab work would have to do to make it work. Guy only wants $125 for a posi 10 bolt. Also, im building an engine projected for 350-400 hp, just street, no track use. Thank you!
Be a lot easier to just swap the axles if the rear end is the same length and the rears are both 10 bolt corporate rears from a 1970-'96 car. After 1996 the axle spine count (diameter) changed from 28 splines to 30.

Big Dave
Big Dave is offline  
post #3 of 6 (permalink) Unread 11-20-2019, 10:51 PM
Moderator
 
Join Date: Jul 2009
Location: Canada
Posts: 1,415
 
The 73 impala has the larger 5x5 bolt pattern, all 71-76 full size do.
62BillT likes this.

Two doors, four doors, wagons, and ragtops.
jayoldschool is offline  
 
post #4 of 6 (permalink) Unread 11-20-2019, 11:32 PM Thread Starter
 
 
Join Date: Sep 2019
Posts: 13
 
Thanks guys, i was thinking that it was going to be the 5x5(although ive seen many wheel company websites say its still 5x4.75 as stock for 73 impala)guess ill keep looking, junkyard has em for $100 open and 125 for posi but it might be a project for next spring, getting chilly here in mn
jmiller1119 is offline  
post #5 of 6 (permalink) Unread 11-21-2019, 01:43 PM
Moderator
 
Join Date: Jan 2006
Posts: 12,556
 
Quote:
Originally Posted by jmiller1119 View Post
Thanks guys, i was thinking that it was going to be the 5x5(although ive seen many wheel company websites say its still 5x4.75 as stock for 73 impala)guess ill keep looking, junkyard has em for $100 open and 125 for posi but it might be a project for next spring, getting chilly here in mn
You are right it could have either bolt pattern. It depended upon the shipping weight of the vehicle; so a lighter Biscayne would get the 4 inch bolt pattern and the heavier Impala or Caprice would get the 5 on 5 (which is actually a 5 bolts on a metric 120 mm). After 1973 all used the metric bolt pattern as GM went totally metric with body parts. It wasn't until they introduced the LS-x in 1996 that the engine and trans went totally metric.

Big Dave
Big Dave is offline  
post #6 of 6 (permalink) Unread 11-21-2019, 10:25 PM
Moderator
 
Join Date: Jul 2009
Location: Canada
Posts: 1,415
 
No.



- all 71-76 full size use 5x5
- they are 5x127 (5x5)

- they all use imperial thread lugs
62BillT likes this.

Two doors, four doors, wagons, and ragtops.
jayoldschool is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Impala Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in













Posting Rules  
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome