repacking bearings

[5banger]

My '83 300TD has started to make a grinding noise from the rear-left wheel at speed. My tech suggested repacking the bearings.

1)Is this a viable DIY project?

2)If not, is $170 for the front and $500 for the back a reasonable quote?

BTW, my '75 240D is still rolling well on the original bearings. Thank you for the continued support, Andrew Seidel.

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89 190E 2.6
83 300TD Turbo
75 240D