possible gearing change
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Mountain Pass
Joined: Jul 2011
Posts: 224
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From: Taylorsville, KY
possible gearing change
2000 ccsb with auto and 7.3. Currently running 35's with 3.73 ratio's. Thinking of going with a set of 4.30 that one of our fellow brothers has for sale but wondering if that is too much gear for my setup. Very little hauling with some highway travels. Mostly just in town stuff. What if I stepped up to 37's?. Motor is stock with no tuner. Opinions please.
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Joined: Apr 2011
Posts: 447
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From: Southern Oregon
Changed mine from 3:73 to 4:30's and made a big difference. I do tow a 36' 5th wheel but even empty with the stock tires...it runs great. Have noticed any big difference in fuel mileage(I have a V-10) when empty and better mileage towing.
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Joined: Jul 2010
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From: Media PA
2000 ccsb with auto and 7.3. Currently running 35's with 3.73 ratio's. Thinking of going with a set of 4.30 that one of our fellow brothers has for sale but wondering if that is too much gear for my setup. Very little hauling with some highway travels. Mostly just in town stuff. What if I stepped up to 37's?. Motor is stock with no tuner. Opinions please.
From what I've read 4.10s make a nice combo with 35"s and a 7.3, still leaves you with enough RPM to travel at higher highway speeds, 4.30s may have your setup over revving that 7.3 on the Interstate. If you do go with 37" then I think you would be good with the 4.30 gears.
4.30 and stock-ish tires make the V-10s very happy, I run 35"s under my 6.8 and 4.88 gears give it an effective 4.39 ratio. My setup handles the towing chores for our 11,000lb TT very well, but the V-10 has almost twice the RPM range as the PSD.
Retired guy fixn stuff
Joined: Mar 2009
Posts: 3,220
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From: East TN
We have 4.30 with 35" in the 99 PSD.
We tow alot so it's great.
Unloaded highway 65 mph is the magic number for mpg. If you can get them at a great deal and don't mind some mpg loss go for it.
Knowing what we know now, go the 4.10. You won't be sorry.
We tow alot so it's great.
Unloaded highway 65 mph is the magic number for mpg. If you can get them at a great deal and don't mind some mpg loss go for it.
Knowing what we know now, go the 4.10. You won't be sorry.
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