35's to 37's - Ford Powerstroke Diesel Forum
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post #1 of 14 Old 04-13-2012, 12:17 PM Thread Starter
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35's to 37's

I'm fixin to buy some new tires and am going with a 37. I have 35's on it now Is it gonna knock my speedo off by much? And will i need to change my gears? Thanks

1995 Ford F350 7.3 XLT
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post #2 of 14 Old 04-13-2012, 06:21 PM
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you'll be off 5.7% over your 35s assuming you have already corrected for 35 from stock or 16.6% over stock

if you have 3.55s you would need to regear, if you have 4.10s you maybe able to get away without, but i would

94.5 F250 Reg Cab 4x4 5 speed 4.10 276000 plus miles

97 F350 Crew Cab LB 4x4 5 speed 3.55 320000 plus miles (parts truck)



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post #3 of 14 Old 04-13-2012, 10:04 PM
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Yeah i would reccommend regearing for sure on 37's. At least 4.11 if not 4.30s. I went with 4.56s wishing i went with 4.30s alil better on the highway but its all what your gonna do with your truck after you put the 37s on it. Like tow alot or just drive it everyday??

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post #4 of 14 Old 04-14-2012, 02:39 AM
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I have 395/75r16 mtz's with 3:73, the 7.3 got the torque to lug the truck up hills in O/D... but if ya run like my set up get ya Gota learn to get into lock up before any hills or else the tranny temps will climb faster then the space shuttle. And when that happens you'll get some practice at replacing the pump seal that blows when the boiling hot fluid returns form the unlocked converter...
4:30 gears and 35's are next on my list of upgrades...


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post #5 of 14 Old 04-14-2012, 04:47 AM
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I am running 37's with 4.10 gears and it does fine. My last truck I had 37's with 3.73 gears, it did fine when a DD, but was a dog when towing.

As my truck sits now I am running about 8mph faster than what my Speedo reads, and turning 2k at 70. Hand calculated I am getting 19-21mpgs if I keep my foot out of it.

I also tow heavy (about 12k) without issues, have never been over 900 on the tranny temps.

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post #6 of 14 Old 04-14-2012, 12:03 PM Thread Starter
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Its mostly a daily driver. I very rarely tow but when i do its usually just 1-2 tons.

1995 Ford F350 7.3 XLT
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post #7 of 14 Old 04-14-2012, 03:46 PM Thread Starter
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And how much would switching to 4:10's cost? lol I'm kind of a noob at this stuff.

1995 Ford F350 7.3 XLT
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post #8 of 14 Old 04-14-2012, 05:36 PM
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what gears do you have now? iirc if you have 3.55 to go to 4.10 you need new carriers to which adds more to the cost

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post #9 of 14 Old 04-14-2012, 07:08 PM Thread Starter
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Well im not sure. i'm turning about 2150 rpms at at 70

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post #10 of 14 Old 04-14-2012, 10:38 PM
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Quote:
Originally Posted by STROKED_NY_023 View Post
I am running 37's with 4.10 gears and it does fine. My last truck I had 37's with 3.73 gears, it did fine when a DD, but was a dog when towing.

As my truck sits now I am running about 8mph faster than what my Speedo reads, and turning 2k at 70. Hand calculated I am getting 19-21mpgs if I keep my foot out of it.

I also tow heavy (about 12k) without issues, have never been over 900 on the tranny temps.

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900* trans temp? holy cow how did you get it past 250*? do you mean egt? lol
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Originally Posted by jfann10 View Post
Well im not sure. i'm turning about 2150 rpms at at 70
sounds like 4.10's if you have 35's now and turning that kause with my 315's i turn a lil under 2500 rpm and i have 4.10's and LS
check your door code $5 says that it would read c4 as your axle code or c5 something like that

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