The long and winding rear axle road has been completed. In the end, the axles were Frankensteined together using the Factory Five provided axle shafts, the used Subaru rear outer CV joints from CA, and the used Subaru rear inner CV joints from PA. Everything fits together well and seems to work fine at this point. Many lessons were learned here…most importantly, don’t assume that aftermarket parts will fit your kit car!
The CV joints and boots story is a long and complicated one, so this post was written by the man himself, Mike the Master Mechanic…
The problem here is that I thought all axles were created equal. First, I ordered a complete set (4) of aftermarket axles with CV joints and boots for a Subaru WRX. Factory Five (FFR) supplies two new axles that are to be used in the rear of the 818. In order to use the FFR axles, you must mix-and-match the CV joints from the original (donor car) axles. The problem is that the axle shafts on all of the aftermarket axles are fatter than the originals. Therefore, the aftermarket CV joints don’t fit the FFR supplied shafts. So, I decided that I must use actual Subaru parts in order to be certain that the CV joints are interchangeable.
New Subaru axles are crazy expensive, so I decided to get some dirt-cheap used Subaru axles. I was able to get some inside front CV joints that fit the FFR shafts, but the rear outside joints seemed rusted to the point that I don’t want to use them. In the 818 manual, they recommend using AutoZone 10705 axles with the FFR supplied 80237 axles. I ordered and received the 10705 axles, but they are skinnier than the Subaru axles, so those CV joints will not work either. Now, I’m waiting for another set of rear Subaru axles to arrive from California (hopefully with less rust) to see if they will work. All of this is a prerequisite to completing the transmission and rear suspension.
Update: Rear Axles Installed
Mike attached the harness bar mount to the rear frame in order to accommodate the over-the-shoulder seat belt harness straps that go through the tops of the racing seats. Like I always say, more safety, more fun…bring the speed!