TheAMCForum.com Homepage
Forum Home Forum Home > The Garage > Transmission & Drivetrain
  New Posts New Posts RSS Feed - Rear axle ratio
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Click for TheAMCForum Rules / Click for PDF version of Forum Rules
Your donations help keep this valuable resource free and growing. Thank you.

Rear axle ratio

 Post Reply Post Reply
Author
Message
InRogue View Drop Down
AMC Nut
AMC Nut
Avatar

Joined: Aug/20/2018
Location: Florida
Status: Offline
Points: 362
Post Options Post Options   Thanks (0) Thanks(0)   Quote InRogue Quote  Post ReplyReply Direct Link To This Post Topic: Rear axle ratio
    Posted: Oct/21/2018 at 4:50pm
Anyone know off hand know the axle ratio for a '66 American Rambler Rogue with a 232 6 cylinder and a Flash O Matic trans? I'm getting ready to install a V8 and possibly a Ranger or S-10 rear axle and want to get an idea on axle ratio options.   
Back to Top
tufcj View Drop Down
Supporter of TheAMCForum
Supporter of TheAMCForum
Avatar
Supporter of TheAMCForum

Joined: Jul/10/2007
Location: Watkins, CO
Status: Offline
Points: 4066
Post Options Post Options   Thanks (0) Thanks(0)   Quote tufcj Quote  Post ReplyReply Direct Link To This Post Posted: Oct/21/2018 at 6:23pm
My 69 TSM shows 3.15 ratio standard on a 6 cylinder with the automatic and manual trans, 3.54 if it had overdrive.  I'd imagine it was the same in 66.

Bob
tufcj
69 AMX
74 Javelin AMX
67 Rogue

If you need a tool and don't buy it...
you'll eventually pay for it...
and not have it.
Henry Ford
Back to Top
tyrodtom View Drop Down
AMC Addicted
AMC Addicted


Joined: Sep/14/2007
Location: Virginia
Status: Offline
Points: 6199
Post Options Post Options   Thanks (0) Thanks(0)   Quote tyrodtom Quote  Post ReplyReply Direct Link To This Post Posted: Oct/21/2018 at 6:28pm
According to my 66 TSM,  3.31 was standard for the 232, straight drive or auto.
While 2.73 was on the 199 auto,  with 3.31 optional.

That's surprising.  But TSMs aren't always completely correct.

There's no way to know for sure unless you crawl underneath and look for the gear count tag hanging on one of the gear cover bolts,  because sometimes people did order the optional ratio.
66 American SW, 66 American 2dr, 82 J10, 70 Hornet, Pound, Va.
Back to Top
farna View Drop Down
Supporter of TheAMCForum
Supporter of TheAMCForum
Avatar
Moderator Lost Dealership Project

Joined: Jul/08/2007
Location: South Carolina
Status: Offline
Points: 19611
Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Oct/22/2018 at 5:59am
The 232 was sort of a performance option , whereas the 199 was economy all the way. The 2.73 axle would make it work a little harder taking off, but the torque converter would just slip a good bit more and multiply torque. Wouldn't take off real fast but would pull away ok. The 199 might have had a little looser converter, not sure. I'd rather have the 3.31...

If you're installing a V-8 and using the trans that came with it you want a rear axle ratio similar to what it came out of. Something of similar weight and size to the American. A Fox body Mustang, or an AMC Hornet or American with V-8 and regular three speed.

You can use the American six cylinder axle for quite a while with a modest V-8 as long as you aren't hammering on it constantly or running cheater slicks/big tires. You  can only get an 8" wide tire under the wheel wells, any street tire will break loose well before you strain the rear axle much. Just loosen then torque down the axle nuts to 250 ft/lbs. The ends of the axle will stretch slightly over 40-50 years, which loosens torque. May take a lot more than 250 pounds to get it loose, but stuck isn't the same a properly torqued. The AMC 15 is tougher than you think, just don't pound on it with a 350+ hp V-8. If you're sticking with a stock engine closer to 300 hp or less and street tires it will be fine... with properly torqued axles. Torque will be good for 20+ years, but doesn't hurt to do it every 10 years or so.
Frank Swygert
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.03
Copyright ©2001-2019 Web Wiz Ltd.

This page was generated in 1.484 seconds.
All content of this site Copyright © 2018 TheAMCForum unless otherwise noted, all rights reserved.
PROBLEMS LOGGING IN or REGISTERING:
If you have problems logging in or registering, then please contact a Moderator or