Tranny shifts fine seems to slip when cruising - Ford Powerstroke Diesel Forum

 
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post #1 of 5 Old 03-09-2009, 05:26 PM Thread Starter
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Tranny shifts fine seems to slip when cruising

Just like it says it shifts just fine into all gears but when i get cruising in od it seems to slip. I posted this before but its getting worse. The rpms dont drop much if at all i really cant tell. It is definately noticable though like a several shakes and then it quits for a while and comes back. I am leaning toward tourqe converter slipping but i am no expert. Is someone could help or tell me how to fix the slipping it would be great. Thanks

Early 99 f-250 cab and half longbed 4" intake and exhaust edge evolution II(for egt and boost guage only), trans temp guage trucool max 40K, TW 6 pos
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post #2 of 5 Old 03-09-2009, 05:30 PM
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have you turned your line pressure up for the shift firmness? mine was doing the same thing. i have the edge evo as well. after messing with the shift firmness and shift rpm it stoped doing it. may be the same in your case, maybe not...

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post #3 of 5 Old 03-09-2009, 05:38 PM Thread Starter
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well idk know i guess. Its in tow mode so i imagine they would have increased them. ill try tuning it to stock and see if that helps. which way and how much did you adjust yours to get it to stop

Early 99 f-250 cab and half longbed 4" intake and exhaust edge evolution II(for egt and boost guage only), trans temp guage trucool max 40K, TW 6 pos
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post #4 of 5 Old 03-09-2009, 07:48 PM
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i have all my shift firmness to the max. The 3rd-4th shift rpm is the only one i changed, i believe its set about 150-200rpm above what ever the base is that comes up. so like 3350-3500... you will just have to mess with it till it stops slipping/searching between gears.
oh p.s mine only did it when i was floored.

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post #5 of 5 Old 03-10-2009, 12:43 PM Thread Starter
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YA i think we must be talking about different things mine isnt searching for gears its just slipping. And my shift firmness is not nearly that high

Early 99 f-250 cab and half longbed 4" intake and exhaust edge evolution II(for egt and boost guage only), trans temp guage trucool max 40K, TW 6 pos
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