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first long test ride

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Old Aug 4, 2014 | 05:26 PM
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first long test ride

Took my 7.3 1991 f350 DRW CC out for a nice ride today, went from bensalem pa to staten island NY, at my office now, ran great

on NJ turnpike was doing about 70 at 2300RPMs , is that normal for a 4 speed with OD?

will be driving her home again in about 2 hours. will check oil to see how she did.

Thanks
Dave
 
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Old Aug 4, 2014 | 08:45 PM
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yep mine turns 2500rpm at 75,
 
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Old Aug 4, 2014 | 09:12 PM
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Originally Posted by davidwjacob
on NJ turnpike was doing about 70 at 2300RPMs , is that normal for a 4 speed with OD?
Yeah, though it's probably more like 2500RPM.
This is why people put 3.55 gearing or GVODs in these, if doing a lot of 70mph cruising -- NA, you lose MPG at those RPMs.
 
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Old Aug 5, 2014 | 08:01 AM
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If you haven't checked yet, being an F350 and having the OD it's more than likely a 4:10 rear. Those RPMs support that.
 
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Old Aug 5, 2014 | 01:19 PM
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Originally Posted by Macrobb
Yeah, though it's probably more like 2500RPM.
This is why people put 3.55 gearing or GVODs in these, if doing a lot of 70mph cruising -- NA, you lose MPG at those RPMs.

Sorry newbie here: what are GVOD's?

thanks
Dave
 
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Old Aug 5, 2014 | 01:52 PM
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Gear Vendors Over-Drive. $$$
 
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Old Aug 5, 2014 | 10:02 PM
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I think he just has a 5-speed with 4.10 gears, I've heard people call a 5-speed 4-with overdrive before. so 2300 at 70mph is right
 
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Old Aug 5, 2014 | 11:08 PM
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Originally Posted by Red454sedgwick
I think he just has a 5-speed with 4.10 gears, I've heard people call a 5-speed 4-with overdrive before. so 2300 at 70mph is right
With stock tires? IIRC, 60MPH is around 2150, so 70 would be near 2500. This is with a ZF-5, 4.10's and 235-85-R16s.
 
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Old Aug 5, 2014 | 11:12 PM
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Originally Posted by Macrobb
With stock tires? IIRC, 60MPH is around 2150, so 70 would be near 2500. This is with a ZF-5, 4.10's and 235-85-R16s.
i don't think their stock tires, ill get the tire measurement tomorrow off truck.

whats IIRC?

thanks
Dave
 
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Old Aug 6, 2014 | 07:56 AM
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If I Recall Correctly


Acronyms for Newbies
 
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Old Aug 6, 2014 | 08:21 AM
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thanks

--Dave
 
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Old Aug 6, 2014 | 08:52 AM
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You won't have the 5th + OD unless you have a gear vendor's unit, but with stock tires and a ZF-5 speed this is what your rpm's will be:
 

Last edited by Ford F834; Aug 6, 2014 at 08:56 AM. Reason: Wrong pic
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Old Aug 6, 2014 | 08:54 AM
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You won't have the 5th + OD unless you have a gear vendor's unit, but with stock tires and a ZF-5 speed this is what your rpm's will be:

 
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Old Aug 6, 2014 | 08:55 AM
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is my gear ratio on a sticker somewhere in the truck?

--Dave
 
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Old Aug 6, 2014 | 08:56 AM
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Originally Posted by Ford F834
You won't have the 5th + OD unless you have a gear vendor's unit, but with stock tires and a ZF-5 speed this is what your rpm's will be:

Isn't that for a 4:88 rear? Or am I reading that wrong?
 
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