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Is it crunching into 2nd and 3rd, or from 2nd into 3rd mate? Whining in 5th is bearings or the gears are fooked, but I'd bank on bearings tbh.
Price wise you're in for a big bill mate.
£170+vat to sort the 2nd gear crunch assuming it's crunching into 2nd.
£380 (incl vat) to sort the 3rd gear...
Depends on how good you are with the spanners mate, but I'd say about 4-5hrs labour for a garage to remove the box and the same to refit. Add a clutch in to the mix whilst you're in there (£100) and then whatever you get charged to reseal the box.
That's the selector seal leaking or the casing join requires resealing. If it's the latter, it'll leak like a sieve tbh.
Gearbox out job I'm afraid in both cases.
If they say ASM on them or in the description, they're anti submarine mate. Most shroth harnesses can be added to, to make them a 5 or a 6 point harness.
It'll be the casing join that's leaking or the selector shaft seal. If the box is coming out, you will need to reseal the casing and replace the selector shaft seal and bushes. No point replacing the diff seal unless you drop the diff out of the box.
Try a different throttle body on it if you can. Also, check the wiring in the inner wing fuse box. White plug - open it and have a look to see if you can see any corrosion.