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  #1  
Old 10-17-2012, 12:01 AM
LTbrassballs
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Talking 5 speed vs 6 speed PSD

Question about the difference between the 5 speed and the 6 speed F250's, specifically the 2000 year. I heard the 6 speed is the same as a 5 speed but it just has a granny gear with it. What dya'll know about this? I'm lookin to buy a PSD and from my research the 2000 F250 is the best, and I figure I'd get a 6 speed to help with mileage. Any input is much appreciated!!
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  #2  
Old 10-19-2012, 03:46 PM
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Re: 5 speed vs 6 speed PSD

No one knows????
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Old 10-19-2012, 04:08 PM
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Re: 5 speed vs 6 speed PSD

I didn't know they made the sd's in a 5spd........ But the 6spd has shown to be better than the 5spd in the obs. The overall gear ratio is close to the same. The 6spd has a better split between gears.
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Old 10-19-2012, 04:18 PM
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Re: 5 speed vs 6 speed PSD

I'm fairly certain the SD's only came with the ZF6
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Old 10-19-2012, 05:27 PM
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Re: 5 speed vs 6 speed PSD

early 99 SD's came with a 5-speed IIRC.
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Old 10-19-2012, 08:59 PM
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Re: 5 speed vs 6 speed PSD

stock manual trans in the 99 superduty was a 5 speed. 6 speed was an option.
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Old 10-19-2012, 11:59 PM
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Re: 5 speed vs 6 speed PSD

Do you know if the final gear (5th for 5 speed and 6th for six speed) ratio is about the same?
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Old 10-20-2012, 03:13 AM
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Re: 5 speed vs 6 speed PSD

IIRC, they are the same.
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Old 10-20-2012, 03:14 AM
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Re: 5 speed vs 6 speed PSD

ZF-5 5.72 2.94 1.61 1.00 0.76
ZF-6 5.79 3.30 2.10 1.31 1.00 0.72

I don't know if the ZF-5 referenced is a S42 or S47. But the ZF-6 appears to be lower geared before you hit direct. OD is higher.
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Old 10-20-2012, 12:42 PM
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Re: 5 speed vs 6 speed PSD

Quote:
Originally Posted by 92f350cc View Post
ZF-5 5.72 2.94 1.61 1.00 0.76
ZF-6 5.79 3.30 2.10 1.31 1.00 0.72

I don't know if the ZF-5 referenced is a S42 or S47. But the ZF-6 appears to be lower geared before you hit direct. OD is higher.
Those gear ratio's are for the newer 96' up s47 tranny.. I have owned both, the s47 will launch a load a hell of a lot better then the s42.. I knew folks who left early style fords for dodges back in the day, because of the much better launching of the dodge.. Ofcourse the dodge boys like to say the ford's engine was the blame.. Not so!!
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