4th gear question - Ford Powerstroke Diesel Forum
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post #1 of 14 Old 05-16-2012, 06:56 PM Thread Starter
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4th gear question

I have a 08 f250 hs tuned s1m trans tune. While in 4 th gear when you let off of throttle the engine drops to idle. It does this in all trans tunes I have tried. When you put it in tow/ haul it holds back and doesn't drop to an idle what could this be? How can I fix it?
Thanks for help
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post #2 of 14 Old 05-19-2012, 07:32 PM
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Mine does that too (I thought mine was doing it in 5th but I cant say I paid much attention). Then you have to get the revs back up (1600-1700ish) before it accelerates again right? I would also like to hear if this is a problem.

2008 (Job 1) F250 King ranch 4x4, snow plow prep package with 2.5 level. Black Maxx, B&W Diehard platinums. Dieselsite coolant and transmission filters, NCU Motorsports/amsoil oil bypass kit. Turbo blankets, 5.5 PMF traction
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post #3 of 14 Old 05-19-2012, 08:03 PM
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Sounds like the TC isn't locked up.
Idk what lock up tunes are on the particular one, but that's just what it's doing, to me anyway.


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2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
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post #4 of 14 Old 05-20-2012, 11:01 AM
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Your right it is 4th gear. And according to my black maxx the TC is locked up.

2008 (Job 1) F250 King ranch 4x4, snow plow prep package with 2.5 level. Black Maxx, B&W Diehard platinums. Dieselsite coolant and transmission filters, NCU Motorsports/amsoil oil bypass kit. Turbo blankets, 5.5 PMF traction
Please collect and message me Shell, Rotella oil cap codes aka "my miles matter" I'm trying to save up for a hat or something.

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post #5 of 14 Old 05-20-2012, 11:12 AM Thread Starter
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I can feel the converter locking up and it shows locked up on my mini maxx.
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post #6 of 14 Old 05-20-2012, 11:14 AM
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I know this is a completely different trans but same idea.
I can lock mine up in second or third, have the OD button on, and once I let off the gas, it will drop to an idle.


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post #7 of 14 Old 05-20-2012, 02:12 PM
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Mine does this thing where if I'm on the highway and I'm cruising along if I let off because someone cuts me off it drops rpm then if I go to get back on it some times it's really sluggish and super low rpm I have to mash it for it to drop a gear is that the tc? Sorry for hijacking

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post #8 of 14 Old 05-22-2012, 07:21 AM
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Quote:
Originally Posted by sbfd1268 View Post
I have a 08 f250 hs tuned s1m trans tune. While in 4 th gear when you let off of throttle the engine drops to idle. It does this in all trans tunes I have tried. When you put it in tow/ haul it holds back and doesn't drop to an idle what could this be? How can I fix it?
Thanks for help
Does it do it as soon as you let off the throttle or does it coast for a bit & then the rpm's drop off? When I let off the gas at high way speeds it will stay at higher rpm until 80kph & then drop off to idle rpm but as soon as I hit the pedal it revs right away & it is good.

08 F350 JOB 1
H&S MINI MAXX HD300 W/S1M
SINISTER EGR/COOLER DELETE
6000K BEAMERS HID HEAD & FOGLIGHTS
KMC XD WHEELS W/NITTO TRAIL GRAPPLERS
2.5" LEVELING KIT
DIESELSITE COOLANT FILTER
ROTELLA EC-1 RATED COOLANT
5" DP BACK FLO-PRO EXHAUST
FLO-PRO CAC PIPE & INTAKE ELBOW
CCV MOD
AIR LIFT 5000LB AIR BAGS W/ONBOARD COMPRESSOR
AFE CAI
PMF TRACTION BARS
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post #9 of 14 Old 05-22-2012, 09:23 AM Thread Starter
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It holds for a second then drops off when you get back into it seems pretty harsh if you are not easy on it.
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post #10 of 14 Old 05-22-2012, 11:21 AM
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That's what mine does and it is harsh if you get back on it

01/07 Job 1 F350 H&S Tuned. ARP Studs, AFE 4'' straight pipe, EGR delete with elbow, AFE stage 2 CAI, 6'' lift on 37s, 20x12 Fuel Nuts two piece, Sinister coolant filter, CCV Mod, Projector headlights HID kit
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