Hey boys --this is what we use , Corvette C4 /5 wheel hub --just bolt on and go ( the CV drive spindle is extra)
Kevin , those bearings are good ,but fitting them is a PITA ---they're pressed into something and retained by a large circlip
Just had a quick look on a Corvette forum and it would appear that there are longevity issues too with the C4/5 stuff when used in anger. And you have to replace the complete unit which is not cheap. Hmmm....
Besides the bearing issue on all four wheels there were a couple of other areas that needed attention in the back. The trans which is only supported by the adaptor plate was found to be moving up and down as the plate flexed due to torque reaction from the driveshafts. Not something I had expected with 12mm 7075 aluminium tooling plate!
I also found a crack in the rear chassis crossmember, this was caused by chassis flex as that area was essentially untriangulated. The original plan was to fit a plate under the chassis at the rear to stabilise it, but the bellhousing was going to get in the way so I temporarily threw it in the too hard basket!
So the logical step was to tie the trans into the rear of the chassis which is well structured to resist the vertical trans movement and also to tie the suspension pick up points into the bottom of the trans to stop sideways chassis deflection. I have done this on both sides, and at the rear we now have a 'birdcage' GT40! Tubes everywhere! I also put a couple of flanged gussets on the rear crossmember to spread the loads. These have a hole in them, not so much for lightening but as an attachment point for the shackle and chains used to secure the car on the trailer. Killed two birds with one stone. Actually, I did the gussets the night before the 13 Dec race meeting as I spotted the crack during my pre meeting preparation. Welded it up and fabricated and welded in the gusset to spread the loads in the tube junction.
Anyway, car is now back together with all the essential work done and suspension reset. I have reduced the camber to 0.5° all round and reduced rear caster to zero. I'm hoping this will lead to a further improvement in lap times. We seem to be going in the right direction. We will be using a digital thermometer to measure the tyre temps this weekend and will further refine the settings based on the readings.
Pics.
#1 is the original chassis configuration
#2 shows the gussets added to the rear crossmember
#3 shows additional right hand support
#4 and #5 show it's starting to get quite busy round the back now
#6 is how it all looks from the back with suspension and ride height set.