thanks for that and i apologise for the delay . The delay was brought about by the demise of my F 100 (and nearly me too!). In the interim the axle ex- 420 has been fitted ..apparently witout hiccups. I will post if problem develops.

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kel347
1986 SEC560 250000km
1976 F100 (No more..went gardening and took out some trees..damaged driver and destroyed vehicle...plastic is fantastic but steel is for real)
2000 Landcruiser
1981 corvette