1970 Duster base model slant 6 rear differential 2070051 spider kit

When I chose this axle I was unaware of its weaknesses. The larger splined gears are ok while the smaller gears are 80% gone. It is a 293 ratio/ 3000 lb. car/ '82 Chevy V6. The unit came with the 5 on 4.5 pattern. The donor car was on a truck headed to the crusher in 1985 so I told the guy I'd give him $50 if he would pull it for me. I did not know the ratio until I pulled the cover last week. I was hoping someone had changed out a set of spiders but this site is more into power & they would have swapped out the axle for a beefier unit. That means there should be an original rear axle behind someones shop. I'll know more this Sat. when we take it apart. The axle splines appear to be ok. While it was the weakest of all their axles it was used extensively across the Chrysler line from what I can tell ending in about '74. The owner needs to get a heavier unit cut down but she says she can't afford it. I was also hoping someone might have a used set or NOS set of spider gears that I could buy if the set I bought doesn't fit. Not likely to find one local but you never know. I have a local mechanic checking with a MOPAR guy in my area. Thank you for helping me. joel PS I had talked to Randys on Mon. & he said "good luck"!