Anyone running 40's? - Ford Powerstroke Diesel Forum
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post #1 of 16 Old 03-03-2010, 12:43 PM Thread Starter
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Anyone running 40's?

or 39.5???? i was wondering what kinda fuel milage i'll be seeing as i'm about to move up from a 36 to a 40... with the 36's i'm currently averaging around 13mpg in these winter months... Any input on 40's would be great thanks!
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post #2 of 16 Old 03-03-2010, 12:50 PM
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I would say you need some new gears, maybe like a 4.56 or something like that to run those 40's, assuming you havnt changed out already.

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post #3 of 16 Old 03-03-2010, 12:52 PM Thread Starter
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i'm running 3.73 right now.... would i not have any power if i didn't change gears or what?
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post #4 of 16 Old 03-03-2010, 12:53 PM
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IDK from experience but they say the largest tire to run with a 3.73 is a 35'', someone should chime in. Would you be pulling a lot?

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post #5 of 16 Old 03-03-2010, 12:58 PM Thread Starter
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I'm running 36's right now w/ the 3.73s and it pulls fine and is pretty fast for a big *** truck.... but i found some 40" wrangler mtrs for $1000 for all 4 and don't think i can pass that up... but if it's not a good idea i don't think i'll be doing it....
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post #6 of 16 Old 03-03-2010, 01:03 PM
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I dont know how large you could run, some one will chime in with more knowledge...

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post #7 of 16 Old 03-03-2010, 01:06 PM
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im running 40x17r16.5 ground hawgs and im on stock gears still... only problem you will have is higher egt's... but personally it feels the same as 4:56's cuz my brother had same truck as me and had 40's with 4:56's and he had some lower egt's... but thats only my opinion... you will see a rpm diff but personally no power diff...

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post #8 of 16 Old 03-03-2010, 01:11 PM
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also i forgot to tell my mpg lol... i get like 10-12mpg city and when i run to the coast at like 65mph i usually avg 15-16...

2002 7.3L
4 door 4x4
AFE stage 2 extreme
zoodad mod
4" magnaflow from turbo back
4-6" tip
TSD 6 position chip
stock, high idle, economy (80), tow (80), hot 1 (120), hot 2 (140)
10.5" BDS lift
40/17R16.5 ground hawgs
16.5" x 14" weld racing rims
autometer c2 gauges, trans temp, pyro, boost
6.0 trans cooler conversion
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post #9 of 16 Old 03-03-2010, 01:11 PM
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Runnin 38's on 3:73,runs fine,13mpg,but I am sure 4:88's would be much better pullin power.
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post #10 of 16 Old 03-03-2010, 01:57 PM
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i have 40's also and get 13 or so with stock gears im going to gear but that will be a little bit
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