I think Mike nailed it. Happened to a friends D90 once, there is a shift lockout solenoid on the Tcase that prevents you shifting into Lo at say, 75 MPH BOOM! Dealer can test and replace it quickly and cheaply.
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"The Goat",1973 Series III coil conversion, Daihatsu 2.8 Td, power steering, dual ARBs Etc.
'91 RRC, bone stock
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