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Q: differential leaking

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was told seals or gaskets were not available and need to replace entire unit. what would this cost? it is the front differential on a 4wd.

My car has 68500 miles.
My car has an automatic transmission.

If your transaxle is leaking from the left side axle shaft seal then you can repair it by having the inner axle CV joint inspected for damage and replace the transaxle shaft bushing and seal on that side following technical bulletin 16-0043 dated March 2016. The side bushing gets worn and then may damage the CV joint surface and leak from the seal.

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