it shifts to high gear right away? that what you mean?

tranny and locks are vac controlled

if you have played under the hood i would check to make sure no lines came loose a bit

you have high miles, vac pump rebuild??

i rolled in a new chain, rails and tensioner just to be safe, a bad vac pump is the same as a bad chain

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1985 300D - 599,xxxk - blue interior #265 Monark Nozzle, AL129X, 15" Ronals, Gen II Big Brakes hunting
1985 300D - 491,xxxk - in prog-{A-A IC, 3" exhaust, psi\pyro, 28*BTDC, Hella Euros, IP Limiter removal
1985 300TD - 783,xxxk - parts car,used new engine with ALDA cap inplace
1987 Kenworth T-600 8LL 425 CAT Mech. - 6,000,000+k - DEI exhaust wrap, punched through resonators, 1 recent rebuild,