The stock length of a Fox rear is 59 1/4." The pin-drive length is 54 1/4" ( 5" less, 2 1/2" per side). The stock Fox axles are 29 1/4" long, so they would have to be shortened 2 1/2" each (or 26 3/4" overall). Moser or any other axle company can sell you custom axles in any length you want.
Kouros is running a narrowed 3-link on his car. You might try PMing him. As I recall, he ended up spending pretty much the same as an IRS would have cost but the 3-link will hook up like no tomorrow. I've thought a lot about going that route, but will probably go for the IRS.
Any rearend shop can do it. I've used Currie Enterprises, Sutton Engineering, and Tom's Differential in my area. There must be some shop in your area that someone an recommend. Shipping costs on a housing can be a killer. The cost will vary by shop and what they want to do. Around here I've paid between $100 and $250.
I narrowed an 8.8 for my MK I before Factory Five developed IRS. Sutton Engineering did the job and I hooked Kouro up with their phone number. The deep dish GT 40 wheels looked real pretty but it was an expensive way to get marginal handling and a harsh ride.
As soon as Factory Five Racing had IRS I was an early one to do the pin-drive retrofit.
I agree that narrowing the housing is a couple hundred bucks. When you add up disk brakes, bearings, seals, new shortend Moser resplined axels, 3.55 gears, installation and set up fees you end up with pretty wheels that ride like a truck.
[ November 02, 2006, 06:17 PM: Message edited by: Roger ]
A forum community dedicated to Factory Five owners and enthusiasts. Come join the discussion about performance, racing, conversions, modifications, troubleshooting and drivetrain. We discuss MK4, GTM, 818, Type 65 coupe, roadsters, and more!