Actually, I'll modify that slightly -- it's possible there's a linkage
problem and you're not getting full open to the control valve(s).
That did occur on my 955 utility tractor. But, of course, that's not
slippage in the transmission, it's an external controls problem.
I wouldn't go so far as the other poster as to say there's no hope,
either. It's quite possible even if it is slipping (and, of course,
"slipping" is a misnomer in the sense of the internals, in all
likelihood it's a seal leakage or the pump) and might be reasonably
repaired. Don't know the model number well enough to know how big/
expensive/old the beastie is.
My recommendation is to check what you can and then call Mr Deere and
talk to the shop guy and see what he says...
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