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post #1 of 12 Old 04-02-2013, 06:14 PM Thread Starter
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Weird tranny actions

Hey, my 99 4R100 has been doing some weird stuff. First thing in the AM it won't shift into overdrive until the truck reaches operating temp. Never done this before.

The other day, I had a small gap in traffic, so I gunned it to pull out and it felt like the tranny slipped a bit, I back out and went again and it took off, then through all the gears it seemed like it slipped a bit. It hasn't done it before and hasn't done it since, and that was about 450-500 miles ago.

Any ideas?



1999 F250 Lariat 4X4 Offroad
Under the hood: 7.3 diesel, 4in straight piped to 6in shotgun dual stacks, DIY 6637, Bigg Boost. Foil delete. Riffraff FRx. IH Bellowed Up Pipes. Wicked Wheel Gen 1. TS Chip with canned tunes
Cosmetic: Bushwhacker fender flares. Moto Metal 951 18's wrapped with Nitto Trail Grapplers 295/70/18
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post #2 of 12 Old 04-03-2013, 03:46 AM Thread Starter
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1999 F250 Lariat 4X4 Offroad
Under the hood: 7.3 diesel, 4in straight piped to 6in shotgun dual stacks, DIY 6637, Bigg Boost. Foil delete. Riffraff FRx. IH Bellowed Up Pipes. Wicked Wheel Gen 1. TS Chip with canned tunes
Cosmetic: Bushwhacker fender flares. Moto Metal 951 18's wrapped with Nitto Trail Grapplers 295/70/18
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post #3 of 12 Old 04-03-2013, 05:29 AM Thread Starter
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Anyone?



1999 F250 Lariat 4X4 Offroad
Under the hood: 7.3 diesel, 4in straight piped to 6in shotgun dual stacks, DIY 6637, Bigg Boost. Foil delete. Riffraff FRx. IH Bellowed Up Pipes. Wicked Wheel Gen 1. TS Chip with canned tunes
Cosmetic: Bushwhacker fender flares. Moto Metal 951 18's wrapped with Nitto Trail Grapplers 295/70/18
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post #4 of 12 Old 04-04-2013, 05:52 AM Thread Starter
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Hello?......



1999 F250 Lariat 4X4 Offroad
Under the hood: 7.3 diesel, 4in straight piped to 6in shotgun dual stacks, DIY 6637, Bigg Boost. Foil delete. Riffraff FRx. IH Bellowed Up Pipes. Wicked Wheel Gen 1. TS Chip with canned tunes
Cosmetic: Bushwhacker fender flares. Moto Metal 951 18's wrapped with Nitto Trail Grapplers 295/70/18
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post #5 of 12 Old 04-05-2013, 03:18 PM
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Only thing I had a problem with when the truck was cold was taking off the truck had no power at all.

Well start with the easy, when is the last time you did anything to the tranny filter? And what is the mileage on the truck?
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post #6 of 12 Old 04-05-2013, 03:21 PM
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I hear the gauges are crap also. I don't know much for trannys, but just curious, on your truck idling will your tranny heat up faster than the motor or heat up faster regardless? mine seems to start reading temp real quick and I find it hard to believe it warms that fast.
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post #7 of 12 Old 04-05-2013, 03:53 PM
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It doesn't warm that fast. The dummy gauge is right in the middle on mine at ~75-80*, and doesn't move a bit up to ~170*.

OP, I'd suggest a flush.

2002 F250 CCSB 4x4
PHP Phoenix, John Woods VB, NUC bypass, 6637

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legislative power, as the consequences will be the same to the people."

--Thomas Paine, Four Letters on Interesting Subjects, 1776
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post #8 of 12 Old 04-05-2013, 04:11 PM
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I knew that wasn't right..Thanks, going to look into that.
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post #9 of 12 Old 04-05-2013, 06:56 PM Thread Starter
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Thanks guys! I know it was rebuild by the PO beginning of march 2012.



1999 F250 Lariat 4X4 Offroad
Under the hood: 7.3 diesel, 4in straight piped to 6in shotgun dual stacks, DIY 6637, Bigg Boost. Foil delete. Riffraff FRx. IH Bellowed Up Pipes. Wicked Wheel Gen 1. TS Chip with canned tunes
Cosmetic: Bushwhacker fender flares. Moto Metal 951 18's wrapped with Nitto Trail Grapplers 295/70/18
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post #10 of 12 Old 04-05-2013, 07:05 PM
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As in PO rebuilt it, or had it rebuilt?

2002 F250 CCSB 4x4
PHP Phoenix, John Woods VB, NUC bypass, 6637

"No country can be called free which is governed by an absolute power;
and it matters not whether it be an absolute royal power or an absolute
legislative power, as the consequences will be the same to the people."

--Thomas Paine, Four Letters on Interesting Subjects, 1776
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