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Just change the fipl to be safe, it is a cheap part, and only lasts about 50k miles. 1.1 on idle, and 3.8 at WOT is good. if you can't hit that, put the new one in. Yes it does control the shift points, and firmness. If it is out of spec, the shifts go to long, and that tends to wear out the trany even faster.
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1992 F350 Crew Cab 4x4 7.3l IDI E4OD No Turbo
1993 F350 Crew Cab 4x4 7.3l IDI E4OD No Turbo
1990 F250 Super Cab 2x4 7.3l IDI E4OD Utility bed
1987 E250 Quadravan 4x4 6.9 IDI C6 Banks Turbo, Gearvendor, and U.S. Gear Exhaust Brake
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