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Thread: 4L80E+decel lockup

  1. #1
    Fuel Injected! gregs78cam's Avatar
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    May 2011
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    4L80E+decel lockup

    This is for any Gurus out there, Is it possible to get my 4L80E to remain locked up while decelerating? If so, How? I have most everything sorted out REALLY well, this is just something I would like to have. I tried changing the normal mode release table to 15 mph @ the 0% TPS cell, that didn't work. Any ideas?
    1978 Camaro Type LT, 383, Dual TBI, '7427, 4L80E
    1981 Camaro Z-28 Clone, T-Tops, 350/TH350
    1981 Camaro Berlinetta, V-6, 3spd
    1974 Chevy/GMC Truck, '90 TBI 350, '7427, TH350, NP203, 6" lift, 35s

  2. #2
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    Re: 4L80E+decel lockup

    THM400 and 4L80E will not provide engine braking in D or OD range. The design of the trans allows overrun clutches to freewheel even if a lower gear is selected electronically. You must use a manual downshift to provide engine braking. The trans design will mask any TCC application during decel also.

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