change your output speed sensor. AFAIK the tcu has to see the output shaft speed and engine rpm to know when to shift. I would also make sure your tps is adjusted properly.
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89 Cherokee Pioneer, 4.0, AW4, D30 Front, Howling D35 Rear, Rough Country 3.5" First Gen Lift, Bald Tires, Stock Rims, NP231.
