My 1963 Nova SS coupe still has its original rear end. I have researched all the words of wisdom stating the overall weakness and part replacement problems along with the 4 lug restriction of the original rear end. So I am stuck with the fact I will need to install a later 5 lug rear end. Also as I plan to install a high powered 327 and 4 speed some day I must consider the very special 4 speed I plan to install. I have a very rare what is called a BRUTE T10 all cast iron 4speed. It has a 342:1 first gear so I am looking for a rear end that can support a 2:29 or 2:56 gear set for good highway mileage. I want to use the transmission as a 3 speed with overdrive. I know that the original rear end can only go as low as 3:08. Is there any bolt in rear ends can I use, that will support these high gear sets? I would like to use a GM rear end if possable and only spend a reasonable amount.