Rear Disc Issues - 8 3/4” Rear Disc Conversion Kit
Looking for some advice!
I purchased an MBM rear disc conversion kit from the US and am experiencing some issues with regards to the rotor fit on my axles. I am using aftermarket 1 piece large bolt pattern (4.5” PCD) axles with .500” screw in wheel studs. The axle register on these axles is 2.835” and given that the hole size on the rotors is 2.845” there is an issue in keeping the rotors concentric with the axles. Of greater concern and compounding this issue is that the rotor stud holes for BBP on these discs is approx .652” and poorly finished at that.
I’m guessing that they feature this size to suit std Mopar press in wheel studs? and that these studs must have an extended shoulder beyond the knurl which exceeds the .400” thick axle flange and then locates the disc rotor in place?
I’m wondering what options I have to correctly locate the disc rotor bearing in mind that I’ll need to have a full engineering inspection performed by our licensing authority?
Looking for some advice!
I purchased an MBM rear disc conversion kit from the US and am experiencing some issues with regards to the rotor fit on my axles. I am using aftermarket 1 piece large bolt pattern (4.5” PCD) axles with .500” screw in wheel studs. The axle register on these axles is 2.835” and given that the hole size on the rotors is 2.845” there is an issue in keeping the rotors concentric with the axles. Of greater concern and compounding this issue is that the rotor stud holes for BBP on these discs is approx .652” and poorly finished at that.
I’m guessing that they feature this size to suit std Mopar press in wheel studs? and that these studs must have an extended shoulder beyond the knurl which exceeds the .400” thick axle flange and then locates the disc rotor in place?
I’m wondering what options I have to correctly locate the disc rotor bearing in mind that I’ll need to have a full engineering inspection performed by our licensing authority?
- Do I look to replace the screw in studs with some press in and if so, what part should I use bearing in mind that I’m looking to run alloy wheels so some extra length is probably needed? I looked at ARP 100-7705 and these don’t have an extended shoulder.
- Do I look for an alternative rotor with a correctly sized register and .500” stud holes and if so, who should I contact?
- Do I use an alternative conversion kit, least desirable given the extra cost and risk in going through a similar experience again?
