What does a slipping tranny feel like? - Ford Powerstroke Diesel Forum

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post #1 of 24 Old 04-04-2013, 10:28 AM Thread Starter
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What does a slipping tranny feel like?

Sometimes on my 275 tune the 3-4-5 shift gets haywire with 1/2 to 3/4 throttle input.. It feels like it's either confused or searching for a gear. This truck is "new to me" and appeared to be stock. I've never seen the tranny above 175 degrees yet. I know the rear end torques pretty good so I have PMF bars on the way and should be installed Monday. Not sure if keeping the *** end firmly planted will clean that up or not...


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post #2 of 24 Old 04-04-2013, 10:34 AM
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Is it just happening on the one tune? Is it a new tune or a new occurrence to an older tune? What are you feeling?


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post #3 of 24 Old 04-04-2013, 10:57 AM Thread Starter
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actually I bumped up from the 250 tune to the 275 because I put on a full egr delete kit and only 3 tunes on the Spartan have cruise control (until I go download all the NEGR tunes from Spartan this weekend) So I guess it's a "new tune" to me and the truck. I did not notice this on the 250. Could I just need to reload the tune? Or maybe it's just a lot of freakin power and I need to get my traction bars installed. I can't tell if maybe the truck is breaking loose a little and there's a slot "hop" it just feels like it's searching/in between gears, but I guess it could be the torque converter disengaging and engaging?
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post #4 of 24 Old 04-04-2013, 11:33 AM
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Is it around 45-55 mph?

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post #5 of 24 Old 04-04-2013, 12:18 PM Thread Starter
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Is it around 45-55 mph?

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Actually yes it is. It's definitely parallel with those speeds. Then it "grabs" overdrive and continues accelerating.
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post #6 of 24 Old 04-04-2013, 01:29 PM
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Do you have a monitoring system? If so can you watch the gear torque converter lock? Watch it. You might not be downshifting to a passing gear when you think it is. Also, when this happens do your RPMs, boost and ICP psi drop? If so you aren't coming off the ground. They would go up in that situation.


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When are they going to have a cash for clunkers?? Im sick of looking at obama stickers.
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post #7 of 24 Old 04-04-2013, 02:18 PM
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My 6.0 does the same thing at 45-55 and the rpms drop from 1800+- to around 1300+- and i can push down on the gas and they stay about the same but my turbo whistle intensifys. I was told its just my TC locking

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post #8 of 24 Old 04-04-2013, 05:08 PM Thread Starter
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I have a dashdaq, I can watch slippage but I guess I'm not sure how to read slippage because it reads weird. Like from 900 to 1.0...

Also, the truck pulls hard *** hell, 3/4 throttle and it'll hit 50psi of boost like it's nothing. Kind of scares me sometimes as I know that's "stranger danger" zone for the stock head bolts.
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post #9 of 24 Old 04-04-2013, 06:41 PM
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You only pay attention to it when the TC is locked. Anytime other than that means nothing really. Once the TC locks, you dont want to see any more than 10rpms of slip at WOT

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post #10 of 24 Old 04-05-2013, 07:08 AM Thread Starter
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Quote:
Originally Posted by WoodBoy View Post
You only pay attention to it when the TC is locked. Anytime other than that means nothing really. Once the TC locks, you dont want to see any more than 10rpms of slip at WOT
Well if that's the case then it must be the tuning or a solenoid. I'll be flushing the tranny and cooler next week and putting fresh fluid in. Hopefully that clears it up. If not then I'll probably try a different tune.
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