4r100 won't shift into second unless you lift off throttle. - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 02-26-2012, 01:30 PM Thread Starter
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4r100 won't shift into second unless you lift off throttle.

I never had a problem with my tranny except hard shifts. Then j traveled across the country with a 4000 pound trailer. Then 2 days later sitting at a stop light, light turns green, I accelerate and it just keeps revving and didn't shift. I let off the throttle then it shifted. It does this just about every 1-2 shift now. Also occasionally when in 3rd or I'd it acts like it is in neutral and just free revs. I lift off the skinny pedal and it's fine. Trans fluid is good, and doesn't smell burned. What is going on? Btw this is a jasper remanufactured "high performance" rebuild.

2008 F250-"White Beauty" Spartan tuning and TCM, 4" downpipe, 5" Flo-Pro exhaust, No Limit Fabrication cold air intake and CAC pipe/intake elbow, Dleted and Studded, Elite 71mm atmosphere turbo, Air Dog II DF-165, SunCoast transmission, River City Diesel torque converter, 20x9 BMF Novakanes, 7" Icon/ 37" Toyo MT, Nitrous Outlet, 659rwhp/ 1375rwtq (Fuel only) 04/19/2014
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post #2 of 12 Old 02-26-2012, 02:52 PM
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That's what mine is doing in 3rd and od. My fluid is bright red in color no bunt smell either. I was wondering if it could be the torque converter? Hope somone can help us with this!

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post #3 of 12 Old 02-26-2012, 03:36 PM Thread Starter
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Hoping it isn't time for a full rebuild..

2008 F250-"White Beauty" Spartan tuning and TCM, 4" downpipe, 5" Flo-Pro exhaust, No Limit Fabrication cold air intake and CAC pipe/intake elbow, Dleted and Studded, Elite 71mm atmosphere turbo, Air Dog II DF-165, SunCoast transmission, River City Diesel torque converter, 20x9 BMF Novakanes, 7" Icon/ 37" Toyo MT, Nitrous Outlet, 659rwhp/ 1375rwtq (Fuel only) 04/19/2014
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post #4 of 12 Old 02-29-2012, 02:54 PM
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my truck is doin a carbon copy of what you described ,i dont know much about trans.but ive been told it could be the shift solenoids ?

07 kr f250 8in lift 37s and 22s strait piped diablo sport programmer and air raid intake
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post #5 of 12 Old 02-29-2012, 03:11 PM Thread Starter
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I contacted Powerstroke specialties and they said it sound electrical ie; bad ground, fouled up VSS in the rear, or possibly solenoids. But doesn't sound mechanical according to them.

2008 F250-"White Beauty" Spartan tuning and TCM, 4" downpipe, 5" Flo-Pro exhaust, No Limit Fabrication cold air intake and CAC pipe/intake elbow, Dleted and Studded, Elite 71mm atmosphere turbo, Air Dog II DF-165, SunCoast transmission, River City Diesel torque converter, 20x9 BMF Novakanes, 7" Icon/ 37" Toyo MT, Nitrous Outlet, 659rwhp/ 1375rwtq (Fuel only) 04/19/2014
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post #6 of 12 Old 02-29-2012, 03:19 PM
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Hey i was just having this problem with my trans from 1st to 2nd on WOT but i took it to a transmission shop and they took the truck for a test drive and put a scan machine on the truck while driving it, it came back as a ICP which is for your senor for you having low fuel pressure (due to possibly having a Chip or programmed truck or bad ICP) the trucks acceleration has to build up enough pressure and be at the right level for the transmission to shift accordingly. If you ICP is going bad it will effect how the transmission shifts... I was thinking i had a solenoid or power band issue and come to find out its due to the lack of motor from being programmed, Im not saying this is the exact answer BUT i was very surprised when i heard if was something due to engine related... Call around and see if you can find a transmission shop that will do a free testing on the truck and see what the scan machine says.. just thought i would pass along what i just found out
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post #7 of 12 Old 02-29-2012, 03:24 PM Thread Starter
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I took it to Oreillys and I read the computer and had no codes.

2008 F250-"White Beauty" Spartan tuning and TCM, 4" downpipe, 5" Flo-Pro exhaust, No Limit Fabrication cold air intake and CAC pipe/intake elbow, Dleted and Studded, Elite 71mm atmosphere turbo, Air Dog II DF-165, SunCoast transmission, River City Diesel torque converter, 20x9 BMF Novakanes, 7" Icon/ 37" Toyo MT, Nitrous Outlet, 659rwhp/ 1375rwtq (Fuel only) 04/19/2014
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post #8 of 12 Old 02-29-2012, 03:28 PM
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I would say try and do the scan while driving they had a snap on one that was real nice and it pulled the code when we were driving... im assuming your truck is chipped... did you have it on the stock setting? is your truck acting up on all settings or just one setting? try to do a driving test on stock then on a tune and see if there is a difference in the shifting of the truck... then try and run the machine while driving if you can... you might have to find a tranny shop i doubt Oreillys will drive around with you
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post #9 of 12 Old 03-02-2012, 04:58 AM Thread Starter
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ok so i stopped screwing around, and decided to call John woods, because every shop in the area was giving me different diagnosis. 1 said, bad valve body, another said bad solenoids, another said needs a complete rebuild.

John asked me to tell him what it was doing and had me drive the truck while he was on the phone. after about 45 minutes to an hour of talking to him on the phone, he said without a doubt it is the solenoids. he asked how hard it shifted before and i told him, and he said ummm wow, so we discussed it and i am going to order the solenoids and the valve body from him. If any of you have any questions or concerns about your tranny, he is a must call. This guy beyond knows the 4r100, and knows every little idiosyncrasy about them..

2008 F250-"White Beauty" Spartan tuning and TCM, 4" downpipe, 5" Flo-Pro exhaust, No Limit Fabrication cold air intake and CAC pipe/intake elbow, Dleted and Studded, Elite 71mm atmosphere turbo, Air Dog II DF-165, SunCoast transmission, River City Diesel torque converter, 20x9 BMF Novakanes, 7" Icon/ 37" Toyo MT, Nitrous Outlet, 659rwhp/ 1375rwtq (Fuel only) 04/19/2014
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post #10 of 12 Old 03-02-2012, 05:32 AM
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Glad you got it figured out.
I haven't heard great stuff about Jasper.



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