Lotus Elan

ARP differential crownwheel bolts

PostPost by: 2cams70 » Mon Jul 09, 2018 2:24 am

Hi Guys,

I am looking to replacing the crown wheel bolts on an English differential centre as part of a rebuild given that it is not unknown for these to break. I am aware that ARP x/flow flywheel bolts can be used where an LSD is being fitted because the LSD's typically have a thicker mounting flange compared to the standard open differential hence requiring a longer than standard bolt.

My question is what bolts are people using where the standard open differential is being retained? I've checked and the ARP flywheel bolts at 0.90" long are too long in this application. The only other bolts I can find in the ARP catalogue are these https://arp-bolts.com/kits/ARPkit-detai ... ordID=3317 (P/N 742-0750) which are the same length as OEM. The problem with these is that they are fully threaded rather than shouldered. I believe it is better practise to use shouldered (like OEM and the ARP flywheel) bolts in this application. I believe new OEM bolts are now obsolete.
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PostPost by: CBUEB1771 » Mon Jul 09, 2018 4:58 pm

TTR supply NAS-specification bolts for the purpose:
https://www.tonythompsonracing.co.uk/parts/final-drive/
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