towing trouble

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Oct 15, 2003 | 06:49 PM

sjerseyhick

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towing trouble

I just made a trip to Virginia. Had some trouble towing approx 6700lbs plus loaded bed. Truck is 99' superduty V10 auto 3.73
Hypertech programmer, K&N FIPK, Borla catback duals, double- helix throttle-body spacer. Problem was going up grades(pulling mountains). Truck went into super-low gear and wouldn't shift out or allow acceleration. Any ideas? I will try programming computer back to stock next time. I need to haul a farm tractor
and don't want a 5 hour trip to be 8 hours.

Oct 16, 2003 | 04:38 AM

charlesvalentine

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From: TEXAS!

I am guessing that its because you were in the mountains. The high altitude in the rockies gave my expy troubles even when not towing anything.

Does it do that at lower alt? up similar graded hills?

Oct 16, 2003 | 07:09 AM

sjerseyhick

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It didn't do it through the rolling hills in Maryland. Normal downshifts as if turning off the overdrive. The computer is programmed for street use. All shift points are 2 to 300 rpm over stock. When trans went into this low gear rpm was 4500 or more
and speeds didn't exceed 10 to 15MPH.

Oct 22, 2003 | 11:07 PM

phonebem

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sjerseyhick- was your O/D OFF light flashing, if it was it very well could be a tranny problem and your truck went into "limp home" mode. I'd advise checking for any stored codes in your computer too.

Oct 23, 2003 | 06:57 AM

sjerseyhick

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The OD light doesn't work. I replaced the switch and cap on shifter. Still nothing but, can feel working when when pushed.
I will check computer at work and get back to you. Thanks!