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Can someone help me with a question about my drive shaft? I have a 1970 dart swinger 340 4 speed 8 3/4 rear end. I built this from a roller. I have a drive shaft that is to short. it seems to measure 3 1/4 across. I bought another shaft but it measures 3" across. will this work? what was it from...

I have a 8 3/4 sure grip rearend, the ring gear has 43 teeth and I think the pinion has 10. can someone tell me what the gear in this is for example 3.91 , 4.10? Thanks.