I just reread your post and saw that there was a shift kit installed.
If the mechanic did it, you're probably in for a hard lesson learned. 
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------------------------------------------------ 1987 Buick Grand National
Budget 4.1, 204/214 cam, TA-49 Turbo, Stockish Heads, V4, MSD50's, TH DP, JayJackson 62mm TB, Translator plus Extender powered. 3680# with pilot
------------------------------------------------ 1993 Mazda RX-7 4.1 Buick Powered
11.20 @ 128mph (2.4 60')!  |