it's been a long time since i updated so i thought i would put a couple more entries in. The rear assembly has now been put back on the chassis. The 2 bolt that fix the lower part of the diff assembly to the chassis needed fixing. One of the bolts was cone shaped , the reason for this was the holes didnt line up quite right and can only guess that it was bodged. Luckily only the bolt was knackered and we managed to repair the thread on the chassis.