Transmission w/ Tuners - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

 
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post #1 of 8 Old 02-25-2011, 05:58 AM Thread Starter
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Transmission w/ Tuners

Ok i have tryed a couple different tuners on my truck....on common problem i am having is a rev/slam and decleration from a on/off ramp...back to acceleration. By looking at the display it seems to be in limbo between 4-3, then slams down into 3rd and will go.
Is anyone else having this problem....is there an upgraded transmission piece that will fix this or is this a tuning problem?

2008 F250 FX4 CC, Short Bed, Red/Chrome
AFE CAI,MBRP Cool Duals,DPF Delete,MBRP 3 inch Cold Side IC Pipe, 37's SS M16's,ReadyLift 2.5/2.0 SST Kit,Rancho RS9000 Adjustable Shocks,Fox Racing Dual Steering Stabilizer,Recon Smoked LED Tails,3rd Brake,Mirror Turn Signals,LED Dome,Smoked Cab Lights
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post #2 of 8 Old 02-25-2011, 07:05 PM
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I believe it's around the 20-30mph mark am I correct? Only thing I can suggest is add half a qt trans fluid and see if that helps. My truck does it sometimes and I have a built trans and run two different companies tunes

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post #3 of 8 Old 02-25-2011, 11:25 PM
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Ya. Check out the thread called "Revs and Slams!" in the tranny problems section. The forum has been talking about it for awhile.

08 F450 CCLB 4.30's
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post #4 of 8 Old 02-26-2011, 01:08 AM
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Pretty common issue that I don't think can be fixed. Stock trucks have been known to do it too, just not the extent of a tuned one.

Hell....I was driving my gf's Honda Civic a couple of weeks ago and the tranny in that thing did it.

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post #5 of 8 Old 02-26-2011, 07:12 AM
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Can you guys explain this? I don't think I've experienced it but my truck shifts a little harder than stock on the "hot" tune but I wouldn't call it "slam"

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post #6 of 8 Old 02-26-2011, 07:31 AM
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Check out the "Revs and Slams!" write up in the problems forum. For most of us it happens around 30-40 mph when letting off the accelerator momentarily and pressing it again. The tranny seems to not know whether to be in 3rd or 4th and then bam, it drops into gear. I guess the closest I can explain it to is as reving the engine and then dropping it into drive. You'll know when it happens. It's a bit more noticeable with higher tuned trucks, but guys have had none tuned trucks do it too. Some have switched out shift solenoids and others have simply added an extra quart of tranny fluid and had some results, but I haven't heard of any permanent fixes yet. You'd think that Ford would have figured it out by now.

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post #7 of 8 Old 02-26-2011, 11:39 AM
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Previously, I had an 04 F150 that did it with the edge evolution, slightly higher speed though.
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post #8 of 8 Old 02-27-2011, 10:47 PM
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mine does it too...about once a month

2008 F-250 CC SB 6.4 FX-4

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