Reverse is fine. Yeah, I knew I goofed. I should have written that it shifts between 1st through 4th okay and that it downshifts into 3rd then back into 4th and repeats that process. Sorry about that.

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1980 300SD (352K)
1978 Chevy Nova (30K original miles)
1994 Dodge Caravan (146K) 4 cyl - why?
1999 Toyota Corolla (Neo synthetic only please)