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Old Jul 29, 2007 | 06:53 PM
  #1  
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man tran ?

NO Kris, It's not what your thinking get your mind out of the gutter JK. What rpm do people with the ZF6 rev at 70mph, 65 mph ect... Also include rear-end ratio, and engine. Thanks
 
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Old Jul 29, 2007 | 07:04 PM
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3.73, 5.4, 2000 rpm's @ 70 mph.
 
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Old Jul 29, 2007 | 07:32 PM
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'05 6.0psd with 3.73 rear i turn exactly 2000rpm's @70mph.
 
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Old Jul 29, 2007 | 08:21 PM
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You also need to know tire diameter, and if they have updated the PCM for tire size if you really want to compare these correctly.
 
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Old Jul 29, 2007 | 10:35 PM
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Yea your right Beerstalker. I think a better question is what is the ratio of the overdrive gear in the ZF6? It sounds like it's almost the same as the 4r100 .72 ish if I remember. I knw that it has the granny gear, but I would hope that the od is a little taller as well.
 

Last edited by yamaguy; Jul 29, 2007 at 10:38 PM.
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Old Jul 29, 2007 | 11:35 PM
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33 inch tires,3.73, 6.0 PSD, 70 mph@2000 rpms.
 
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Old Jul 29, 2007 | 11:51 PM
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I have an early 99 CC with 7.3 PSD. I have the stock tire size - 265-75 R16, and 3.73 rear end. 6 spd ZF6, I run about 2200 at 70 MPH. 2000 RPM gives me 65 exactly by my GPS.
 
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Old Jul 29, 2007 | 11:55 PM
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2007 SRW F350, 3.73 with 18" Conti's (2WD version (Yes they are different))
1950RPM = 110 Km/h = 68 MPH

Yes the ZF6 OD is .72:1
 
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Old Jul 30, 2007 | 12:47 PM
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I knew the 4r100 was .72:1 for OD, but I thought the ZF6 was .77 or .76:1 for OD. It was .77:1 for the ZF5.
 
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Old Jul 30, 2007 | 02:05 PM
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early 99 7.3 DRW F350 3.73 rear on 215/85/16 factory tires turns 65mph at 2000RPM
 
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Old Jul 30, 2007 | 03:34 PM
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03 v10, 35 inch rubber, 4:30 rear gear, 2000 at 60, 2300 at 70.
 
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Old Jul 30, 2007 | 08:19 PM
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Originally Posted by duffman77
2007 SRW F350, 3.73 with 18" Conti's (2WD version (Yes they are different))
1950RPM = 110 Km/h = 68 MPH

Yes the ZF6 OD is .72:1
And here I thought I was the only one who set my cruise at 68.

02 f350 cc lwb srw 3.73 1900 rmp @ 68, 2000 @ 70 stock 265/75/16 (pretty sure that's the right size) Avg 19.85 mpg running empty and staying below 2000 rpm's with ranch hand front & rear bumper, steel tool box with about 400 pounds of tools.
 
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