Hot Rod Forum : Hotrodders Bulletin Board - Reply to Topic -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Suspension - Brakes - Steering> Corvette IRS
User Name
lost password?   |   register now

Thread: Corvette IRS Reply to Thread
Send Trackbacks to (Separate multiple URLs with spaces) :

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Additional Options
Miscellaneous Options

Topic Review (Newest First)
03-02-2003 04:02 PM
Phat He pretty much has put them under everthing. Real nice guy Bob is. Yes it is doable. Have done the vette IRS on a few diff cars and trucks the 84 is the best as you dont have to put silly 18-20 inches wheels yo clear the brakes on like the newer vette stuff needs. Also have used the cheap supercoupe t-bird IRS in some rods(89-96 super charged car not turbo coupe). The vette stuff is cheap and not all that hard to do if you have a little fab skills. Rears around here are about 450-500 bucks. Good luck and give Bob a call.
03-02-2003 03:43 PM
HotRodMan I have a regular 69 Corvette and a Model A with a Corvette rear end. I have been running that for years with no problems. You are right about the parts you mentioned that you have to narrow. In addition, you have to weld in a special bracket for the coilovers, and a special brace and crossbar for the front of the differential.

I am not sure if all vettes have the same bolt pattern on the housing but I doubt it. If you go to they show rebuild kits for Corvette differentials that might give you the answer. It seems 63-79 are the same, then a change is made and 80-82 is the same, then they show another change from 84 to 96.

Some web sites that might give you a more exact answer. They specialize in frames and offer the option of the corvette rear end on a Model A frame. and are both web sites that specialize in Corvettes only and you could post a message on there. Hope that gives you some information to investigate with.
03-01-2003 04:31 PM
adtkart Since the control arms on the 84 Vette rear are mounted forward of the wheel and run back to it, narrowing should not be that great of a problem. It will consist of shortning the half shafts, tie rods, and the spindle rod. I plan to use coil over shocks to eliminate the leaf spring. What I really need to know is, if the cover bolt patern for the rear cover is the same on all Vette housings. Does anyone know?
02-16-2003 02:07 PM
Deuce [quote]Originally posted by adtkart:
<strong>I know that this IRS is wider than what I wanted. I am not really that concerned about the width. Has anyone had experience with these?</strong><hr></blockquote>

The wheels wil be W A Y out from under the fenders. If no fenders are to be used, the space between the body and the tires will appear odd and unattractive. I know a guy who paid a frame shop to build him a Model A chassis with the 84 up rear IRS and they told him it was too wide. He said go ahead. They said OK and went the money. He now has a 5 grand (plus parts)roller that he hates. He has to cut the floor out to clear the Zed rear crossmember. This was done to get the Model A to sit at a normal ride height. I know he would sell it for 5 grand. He is in Indy. A Model T is even more narrow than a Model A

<img src="graemlins/sweat.gif" border="0" alt="[sweat]" />
02-16-2003 01:13 PM
adtkart I know that this IRS is wider than what I wanted. I am not really that concerned about the width. What I am concerned with is mounting the unit. Does anyone know if I can just change the rear cover where the mount is, on this year? I know they sell rear covers at Speedway with the mount where it mounts to the crossmember. Has anyone had experience with these?
02-16-2003 10:43 AM

I believe the problem is that the IRS is too wide to go under a MODEL A. Most Model A builders use a rear end that is 56" measured from where the wheels bolt up (flange to flange). Narrowing the Vette IRS with all the pivot points would be a nightmare trying to get the geometry correct.

Sorry... <img src="graemlins/sweat.gif" border="0" alt="[sweat]" /> <img src="graemlins/sweat.gif" border="0" alt="[sweat]" />
02-16-2003 08:55 AM
Corvette IRS

I just purchased a complete IRs from a 84 Corvette. My plan is to install it in a 1926 Model T Touring rod I am building. I have checked several sources that sell frames and found that they list them with cross members for earlier IRS, but not this one. This one does have the long mount bar for the differential. Does anyone know of a serious problem that I will have with using this system? My plan it to build a frame based on a Model A, so mounts can be made as needed.

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

All times are GMT -6. The time now is 08:45 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999 - 2012. All Rights Reserved.