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Is it bad to keep a 4L80E converter locked up during a shift?

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Old 05-09-2014, 03:39 PM
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Default Is it bad to keep a 4L80E converter locked up during a shift?

I have built a 88 Mustang with a 5.3/4L80E/S475 swap that currently runs mid 10's. I have a Circle D Triple disc converter and am thinking about locking up the converter in second going down the track to help with converter slippage. The trans is stock rebuild with a HD-2 kit. Should I or should I not lock this up in second?
Old 05-09-2014, 04:18 PM
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I've been wondering the same thing. I was going to engage the lock up as soon as I can, which seems to be 2nd. Launch on the nitrous and as soon as I can engage the lock up, do it. See if it picks up.
Old 05-12-2014, 07:22 AM
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Anyone?
Old 05-12-2014, 09:59 AM
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I wouldn't do it with a stock input shaft.
Old 05-12-2014, 09:34 PM
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Well, I'll be finding out how well a stocker will hold. Seen them take way more power than I'm throwing in a heavier chassis.
Old 05-13-2014, 08:30 AM
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In for info. I'd like to lock my stocker aswell
Old 05-13-2014, 10:07 PM
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been curious as well. i have a tci 300m input and cant really find any info on this... dont wanna test it lol

would like to find some conclusive info on what type of rpm differential is safe to lock up with as well. is 1000rpm safe, or 1500, or 2000. seems to me the more rpm differential the harder is would be on everything.
Old 05-15-2014, 02:28 PM
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The stock 6.0L Express vans upshift 2-3 WOT with a locked converter, couldn't be too bad.
Old 05-15-2014, 04:13 PM
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We aren't exactly talking a ton of power there, lol.



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