gears - Ford Powerstroke Diesel Forum

7.3L IDI (Non-Powerstroke) Diesels Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

 
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post #1 of 8 Old 05-13-2008, 08:13 PM Thread Starter
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gears

hey i got 4.10 gears in my truck and cant handle 10mpg with this rise of diesel prices. im thinkin of changing to 3.55 or 3.73's then turbo and boosting the pumps. i am looking for some info on the gears like what size, brand and how much they cost. also difficultily to put in

thanks
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post #2 of 8 Old 05-13-2008, 08:57 PM
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this might help out Gear Ratio / Tire Size Table :: Interco Tire just copy and paste the link, the link shows different tire sizes with different gear ratios and it also what is good and what is bad if you want more highway or more city but yeah it all there and they also have other calculators on there site as well its all under technical info well hope this helps

1996 FORD F250 EXTENDED CAB LONG BOX 4X4
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post #3 of 8 Old 05-13-2008, 09:14 PM
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Sorry for the thread overide, but this is a relevant question:
What is typical RPM level for driving 65 or 70 in an F250 6.0 2003 (4 door 4x4 if it matters) on 33"?
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post #4 of 8 Old 05-14-2008, 07:16 AM Thread Starter
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with my gears, if i go 70 im at a lil below 3000 rpm and my shift point is 2500
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post #5 of 8 Old 05-14-2008, 07:29 AM
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where do you do most of your miles? on highway or in town? if on highway you should go 3.55 around town 3.73
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post #6 of 8 Old 05-14-2008, 07:37 AM
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Quote:
Originally Posted by bronco.2 View Post
this might help out Gear Ratio / Tire Size Table :: Interco Tire just copy and paste the link, the link shows different tire sizes with different gear ratios and it also what is good and what is bad if you want more highway or more city but yeah it all there and they also have other calculators on there site as well its all under technical info well hope this helps
Using that calculator it looks as though I am almost right on in the yellow range with my 4.10s and 235s. I had been wondering about that because I wasn't sure whether the tires were the right size or not. I can't go any bigger without lifting the front as they will rub just a little when turning hard and rolling over a curb or incline now. Nice full wheelwells all around.

Brad
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post #7 of 8 Old 05-14-2008, 09:07 PM
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yeah the gear ratio/tire size table works pretty good from what i found

1996 FORD F250 EXTENDED CAB LONG BOX 4X4
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post #8 of 8 Old 05-15-2008, 11:19 AM
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Find somebody with 3.54 gears and trade with them. I'm going to 4.10 gears and a 5 speed, I'd trade you my 3.54's if you lived nearby. I live in Northern California.

1984 Jeep CJ-7 - 258, 5 speed, 3" lift, 35's
1987 F-350 CC 4x4 - 7.3 IDI, C6, Banks Turbo & Exhaust, 6" lift & 35's
1994 F-350 CC 4x4 - 7.3 IDI, ZF-5, Factory Turbo
2002 F-250 CC 4x4 - 7.3 Powerstroke, 6 Speed - SOLD!
2006 Dodge Ram 3500 Mega Cab - Cummins, 6 speed
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