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Old 03-18-2004, 10:24 PM
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89 trans zf 5 change to 6 spd
anyone done a zf 5 spd change over to a six spd ?? 89 7.3 .i have a low geared tow truck and it whines up way to hard at freeway speeds
    
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Old 03-19-2004, 12:04 PM
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The 6 speed will not get you much extra.
The final drive ratio in the 5 speed is .76
The final drive ratio in the 6 speed is .72

With 32 inch tires that works out to about 5 MPH at 3000 RPM
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Old 03-24-2004, 04:06 PM
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How do you like your 89??
I'm looking at buying one any problems
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97 F250 PSD, sc, 4x4 5sp, 3.55. 150K miles, 6637, Amsoil 5-40w/ bypass, SCTM, auto meter, Napa Coolant fliter. 203*t-stat,
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Old 03-24-2004, 04:21 PM
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89 superdutys are strong trucks.4 wheel disc brakes work well .
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Old 03-24-2004, 04:35 PM
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Are there any problems I should look out for . Is the 89 7.3 a good power plant?
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