General Discussion Discuss your Oldsmobile or other car-related topics.

Rear end question advice please

Old September 11th, 2011, 10:36 PM
Registered User
Thread Starter
Join Date: Apr 2010
Location: Northern Illinois
Posts: 107
Rear end question advice please

I have a 1969 Cutlass with a 12 bolt differential. It's a one tire fire peg leg. It's a Sunday cruiser not a race car. My question is, Is it safe to put a spool in the rear end? I can't afford to do it the correct way with a full posi unit. I would love nothing more than to be able to smoke both tires. I don't drive in the rain. Will I break axles?? Will the tire Drag when I turn?? Is it unsafe for cruising?? I have an open mind to the subject and any advice is welcome. Thanks
1969cutlazz is offline  
Old September 11th, 2011, 11:43 PM
Registered User
ah64pilot's Avatar
Join Date: Apr 2011
Posts: 2,702
If you decide to put a spool in your rear end you will definitely have driveability issues on the street. With the spool both wheels will turn at the same rate absolutely. When you turn, the inside wheel will want to turn slower than the outside wheel. This will cause abnormal wear patterns on your tires. In addition to this, your turning radius will be decreased because of the inability for the tires to turn at different rates. You can do this on a street car, but be prepared for issues when parking in tight spaces or driving on slick roads.

Another question you need to have answered is whether your 12 bolt is a true 12 bolt (8.75" ring gear) or an Oldsmobile 12 bolt (8.5" ring gear). The latter is hard to find parts for...there are a few resources for them but you are limited. I am not trying to persuade you either way...I'm just trying to give you more information with which to base your decision. Either way, good luck with it!
ah64pilot is offline  
Old September 12th, 2011, 07:46 AM
Registered User
jag1886's Avatar
Join Date: Oct 2010
Location: Boise ID
Posts: 1,275
Spools don't work on street cars. Just be patient and save up for a posi unit.
jag1886 is offline  
Old September 12th, 2011, 11:05 AM
Registered User
Join Date: Jun 2009
Location: San Jose, CA
Posts: 3,928
Originally Posted by jag1886 View Post
Spools don't work on street cars. Just be patient and save up for a posi unit.

I'm going to rephrase this just a little.

Spools don't work WELL on street cars. I say this because a good friend of mine has been running a spool on the street for, oh, some 20 odd years now. Yes it drags the tires when he turns, and yes it has a wider turning radius, but he knew that would happen when he installed it.

But I would agree that it's not the best solution and you should either deal with the peg leg or save up some money and have it done properly with either a replacement carrier for your axle, or find a complete axle and just swap them out.
svnt442 is offline  
Old September 12th, 2011, 11:22 AM
Registered User
morepwr's Avatar
Join Date: Jul 2011
Location: Ventura, Ca
Posts: 139
Spools on a street car are not much fun unless it is a radical type hot rod. Not very fun on a sunday cruise type car and also depending on how sticky your tires are, it makes life pretty tough on your axles if they are stock.
morepwr is offline  
Old September 12th, 2011, 11:15 PM
Registered User
Thread Starter
Join Date: Apr 2010
Location: Northern Illinois
Posts: 107
Thanks for the advice. Think I will wait for money to come along some day and do it the right way.
1969cutlazz is offline  
Related Topics
Thread Starter
Last Post
May 1st, 2015 11:02 AM
Transmission and Driveline
September 12th, 2014 11:52 AM
April 23rd, 2012 05:40 PM
October 23rd, 2011 07:20 PM
General Discussion
August 18th, 2011 01:56 AM

Thread Tools
Search this Thread
Quick Reply: Rear end question advice please

Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.