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I think Jim has ID'd the problem. When the unit will only engage/stay engaged at higher speeds when hot, it has to be fluid leakage past seals. It depends on the severity, but you may get by with a fluid change. I had a mild case of the symptoms you describe and draining, then refilling with the Redline MTL gave a major improvement, and I've gotten by for 5 yrs and a lot of miles. I've heard it described as "trans in a bottle".
IPD offer a kit of parts to do a minor rebuild of the OD for about $60.
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Bob (81-244GL B21F, 83-244DL B23F, 94-944 B230FD)
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