Q: Q: Rear differential

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I had my rear differential service on 7/4/16 and the shop put 80w90 in it. &not the 75w140 synthetic that ford calls for. Lest then a day my truck rear diff started leaking even more then before & now the case got hot. I stop driving and waited until the next month 8/4/16 &had another shop well call it shop 2 . Well shop 2 found mental shaving, hardly Any oil & a bad pinion seal. I called shop 1 they said they wouldn't do anything for it. So shop 2 had it all that fix . The truck ran good until about 1 1/2 weeks ago where the sound started coming back . I baby the truck and last two day the noise. Got louder so I stop driving took it back to shop two. They found alot more shaving it it again. But there was still lots of oil. This happend today 2/8/17. And know I have to replace my rear differential all together. I know they put the right oil in it.& the limit slip addtive. My question is do you think the 80w90 messed up my truck even through I got the oil replace in a month time?

My car has 105000 miles.
My car has an automatic transmission.

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