35" tires, hopped curb, now shifting early into 3rd - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 07-12-2011, 04:19 AM Thread Starter
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Exclamation 35" tires, hopped curb, now shifting early into 3rd

So I added 35 x 11.5 x 18 onto my 02 2wd auto powerstroke truck on Sunday. I was coming to work this morning and hopped a curb doing about 40 ish. When I came down off the median I stopped and checked out the tires, the underbody etc. Didn't see anything wrong. Counted my lucky blessing and got moving.

My truck always shifted on its own @ 35mph into I assume 3rd. After i hit the curb it now shifts @ 30mph. There's no lights on, it shifts others gears fine, and nothing seemed broken.

Should I be worried ? Now that i hit the curb, its shifting 5mph sooner into gear, and it drops down to like 1100rpm. It still accels fine. I tow about 7k pounds once a month, I don't want my trans to crap out on me. I have 217k miles on the rig and never had any drivetrain problems other than a bad map sensor.


I am a machinist for the New Orleans Sewerage and Water Board. Ive been an inside machinist for 5 years now, and a 1st class one for 2 of those years. We have the tools to check threads, like I said, Im lazy.

07' F250 CC SB 2wd 43k miles
02' CC SB 2wd 225k miles
94' 5.0 GT 135k miles
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post #2 of 3 Old 07-13-2011, 07:31 PM
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are u sure the difference in speed wasnt due to the tire size change?
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post #3 of 3 Old 07-14-2011, 02:48 PM
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Ditto vdog0531..
35's are 9.3% under speed of stock tire.... just FYI

2000 F-350 Lariat CCLB w. 335,000+ Mi
Tymar intake, Straight 4", 6.0 Intercooler, IDP Competition Fuel System, AC's, SB SD Clutch, ZF6 Short Shift Kit
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