I got a 1st series '55 Chevy 3600, 8 lug, 3/4 ton truck. I'm in the process of swapping out the front end to 6 lug and will soon be moving on to the rear end. The '55 is an open drive shaft. Do any of you know what 6 lug rear differential years with open drive shaft I can use on my '55?? Thank you all again!!