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Q:

will only drive in 4wheel-drive on 1990 Subaru Loyale

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
makes a cracking noise in right front wheel. then it quit only will drive in 4wheel drive the drive in 2 wheel drive will not turn
(1) Answer
I think one of the axles came out of the transaxle or the splines on the axle failed. Either way, there could be damage to the transaxle.
Get it checked by a Subie technician.
If you want to find a specialist, here's a directory link for you:
https://repairpal.com/directory?address=26385&car_brand_names=Subaru