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Tranny slips and then it doesn't??

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Old Nov 14, 2010 | 08:31 AM
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Default Tranny slips and then it doesn't??

Ok, I put a 6.0 ltr in my 99 Formula. I have a 4l60e w/ a tci 3500 stall. After the install of everything it all ran great. Shifted fine through all gears. All of a sudden one day it just started slipping at the stall point, right around 3k rpm's. Perfectly fine anywhere below those rpms, pulls great, does a burnout, shifts fine. But as soon as you give it gas and it stalls, it slips. Then just as sudden as it started slipping, it stopped slipping. It slipped for about a week, now it was perfectly fine. Until last night, I went to the store, everything fine on the way there, then when I left, it started slipping again. Anyone have any ideas? Must be electrical right? Tranny was rebuilt a few thousand miles ago.
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Old Nov 14, 2010 | 11:29 AM
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Needs to be tuned for the converter.
What you've done already is hell on the 3-4 clutch, hopefully it'll be ok.
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Old Nov 14, 2010 | 11:33 AM
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You sure your car is not missing? People get that confused a lot of times.
Trans cooler?
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Old Nov 14, 2010 | 12:05 PM
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I have a full tune. The trans. fluid looks and smells good. Brand new TCI 3500 stall.
Is there anything electical that could cause a tranny to slip??? I took an alarm out of it and this happend 2 days later. Drove it for 5 days slipping, then it was fine for 4 days. Now it's sitting in the garage til I figure out what is going on. Someone told me there could be a seal in the trans. that could be blown and is acting like a flap, catching and uncatching. ??
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Old Nov 14, 2010 | 12:07 PM
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It's not missing, I did have a miss, but my tuner fixed that. The motor runs perfect. No trans cooler, but it doesn't matter if its hot or cold, it will slip and not slip either way.
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Old Nov 14, 2010 | 12:13 PM
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You need a trans cooler asap first of all.
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Old Nov 14, 2010 | 12:15 PM
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Yes I know, but I'm just driving normal and it's very cold out.
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