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Old May 25, 2008 | 10:07 AM
  #1  
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azmeeks
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4.30 gears

I have V10 with 4.3 gears in rear. I drive on highway alot at 75 mph and my rpm is around 2500. My question is what affect on engine will be caused by my rpm range of 2500 to 2800? I don't want to shorten the life of my truck but also don't wont to travel under the speed limit. I tow a 7500Ib travel trailer 2 times a year for camping truck does good with tow. Should I keep gears or change to lower rpm?
 
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Old May 25, 2008 | 04:29 PM
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Not an issue, truck is made to run. You are consuming more gas at that RPM than say 2000 but no one would say your motor would last longer with less gearing. If you want to lower your RPMs a little, replace your tires with 285/75 16...a little taller tire will reduce rpms and increase mpgs...of course a little wider tire will decrease mileage so the net with 285s is slight increase in mgs...change of about 5% in rpms
 
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Old May 26, 2008 | 08:27 PM
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if you decide to pull out the 4.30's shoot me an e-mail and i will buy them from you or swap my 3.73's
joe
 
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Old May 26, 2008 | 08:48 PM
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Ok

Originally Posted by joetech
if you decide to pull out the 4.30's shoot me an e-mail and i will buy them from you or swap my 3.73's
joe


Will let you know if I pull 4.30 but I am thinking about the slightly larger tire.
 
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Old May 26, 2008 | 11:15 PM
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Daviddc114
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what does a stock 2000 v-10 limited have for gears?? it has the 4r100 tranny right?
 
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Old May 26, 2008 | 11:33 PM
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Excursions had the choice between 3.73 or 4.30.

4R100 tranny for all gassers & 7.3L PSD. 5R110 behind the 6.0L PSD.
 
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Old May 26, 2008 | 11:44 PM
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how do i tell which ones i have?
 
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Old May 26, 2008 | 11:47 PM
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Look at the label on your door jamb for the two digit code. Post it here or compare it to the list in the Super Duty FAQ posted on top of the SD forum. You have about a 96% chance that you have 3.73s.
 
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Old May 27, 2008 | 12:13 AM
  #9  
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um this is gonna sound REALLY wierd, but its blank, its not faded or rubbed off, just blank... check it out
 
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Old May 27, 2008 | 12:29 AM
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'fraid of that. My 2000 was blank, too. Odd.

There's a tag on the front & rear diff that has the ratio. Much easier to see the one on the front than on the rear diff.
 
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Old May 27, 2008 | 08:31 AM
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just keep me posted
thanks
joe
 
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Old May 27, 2008 | 09:27 AM
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tape a string to the drive shaft. mark the tire move the truck 1 full tire revoluition mark to mark and count the # of times the string wrapped around the drive shaft. 3-3/4 times = 3.73 4-1/4 times = 4.30
 
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Old May 27, 2008 | 09:58 AM
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3.73, it was on the front diff.. 3.73 are not the better option, correct?
 
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Old May 27, 2008 | 12:19 PM
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Better for what?

3.73's are just fine for trucks with stock tires (size-wise) and who aren't over 80% of the GCWR on a regular basis.

4.30's are for the rest of us.
 
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Old May 27, 2008 | 01:50 PM
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i did upgrade to 285 75 16 is this ok with the 3.73s??
 
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