Trannie slip with street tune. What now? - Ford Powerstroke Diesel Forum
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Old 09-01-2013, 02:19 PM
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Trannie slip with street tune. What now?

I have had my SCT with a custom street tune for bout 2 yrs now and have been noticing under heavy acceleration truck would feel like it shifted but rpms don't change which I assume is the transmission slipping. I restored the truck back to stock with the programmer and problem is gone except now she's a dog again.
Would like to retune especially since ill be installing an EGR delete soon. What am I in for with the transmission? Rebuild?
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Old 09-02-2013, 07:55 PM
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Most of the tunes out there allow for some TC slip and some allow for quite a bit, depending on pedal position and load. Since you don't have other HP mods, it is unlikely you have slipping trans clutches or a slipping TC, but it is possible depending on the abuse it may have taken over the years. The best way to proceed is to get the specifics of your tune and when the TC is suppose to be locked or how to lock it. I was surprised to find one of my race tunes was not locking in 5th no matter how hard I tried; that really screws up a dyno run with 1000 rpm of slip!
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Old 09-02-2013, 08:53 PM
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Truck has never towed and I don't beat on it to badly so I wouldn't think abuse is an issue.
Would locking it via the tune cause any other problems? Why would slippage be allowed in a tune?
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Old 09-04-2013, 07:24 PM
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Slippage is normal as it allows the RPM to increase to not bog down and for smoother application of power. It is easier on the drive-train. With higher power, you need to lock it earlier to get the power to the wheels. As well, locking it for towing does give you an engine brake, but can also cause lugging issues when under the turbo and power-band.
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Old 09-04-2013, 07:41 PM
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All good info, thanks!
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