On my 79 T/A i have went with 4.56 gears with no extra modifications. That was with the olds 455 with 100hp shot of nitrous and it held together. I recently put in a ZZ502 and i don't think that the rearend is going to take it? What modifications to the rear will help it withstand this power, i know going to a 12 bolt or a 9" ford is the best idea but i want to make this 10 bolt work because i have already spent some money on it. I see that moser makes forged axles for the ten bolt that still use the c-clips, could this be a good way to go? Thanks in advance.