It has been a while since I drove it... but I think that 1-2 shift is normal, then it goes into neutral (I guess). You can rev it up to redline with nothing happening, untill you slow back down and it shifts back into 1st.

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For Sale: 1982 MB 300TD
1995 Chevrolet Suburban 6.5TD

Sold: 1980 IH Scout Traveler- Nissan SD33T Diesel