Dear Francisco,
Good p.m. and may this find you well. "Over-hauling" an AW-71 tranny is a huge waste of money. These transmissions are very durable. They usually outlast the cars.
Thus, go to a salvage yard, that keeps Volvos. Try to find a low mileage AW-71 (under 100K). Depending on your region, you may pay more than $250-300, or less.
Inspect the fluid. If the fluid is cloudy, and/or brown, black, orange, etc., pass-up that tranny. You want a used tranny, filled with clear, rose pink fluid. When you find one such, buy it.
Get the tranny flushed with Dexron III/Mercon, and installed. The installer should change the tailshaft seal and bushing. If you car's rear main seal is questionable, get that done too, while the tranny is out of the way. After 500 miles, get the tranny re-flushed (not drained, re-flushed) with Mobil1 Synthetic transmission fluid. M1 ATF may cost $7/quart. It will take about 12 quarts.
The bottom line: you spend about the same $$$, as you would with an "over-haul" but get a tranny that will work for several hundred thousand miles, and a new rear main seal (if it is needed).
Hope this helps.
Yours faithfully,
spook
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