4L80E lost 2nd gear
#1
4L80E lost 2nd gear
My 4L80E lost second tonight on a WOT 1-2 shift. It slammed like it always does on the 1-2 shift, then released and hit the rev limiter. 1, 3, and 4 work fine. Lockup works fine. 2nd doesn't work in any gear position, including manual hold 2nd. Trans is vacuum modulated, and has the full manual 1-2 valve body by TransTec.
Any ideas?
Any ideas?
#5
It's vacuum modulated, I can't adjust the shift pressures. My builder set them and I haven't touched them.
By full manual 1-2 I mean that if I put the selector in 1 or 2, it goes not matter what. Even if I'm doing 120mph....put the selector in 1 and you're going for a wild ride
By full manual 1-2 I mean that if I put the selector in 1 or 2, it goes not matter what. Even if I'm doing 120mph....put the selector in 1 and you're going for a wild ride
#7
TECH Fanatic
iTrader: (1)
A vaccuum-modulated unit can be modified by restricting the feed hold in the separator plate. (Not easy) I've hit one with a MIG at very low power to accomplish this, but any spatter sticking to the plate in other areas can cause gasket blowout and trans failure. Plate warps easily too.
A higher-stalling torque converter softens shifts too.
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#8
TECH Senior Member
iTrader: (26)
I was with him when it happened. By loosing 2nd, what he is referring to is that it shifts like there is no second, stays in first till it's going fast enough to shift in to third, even if you manually put it in to second, just stays in first. When it does finally shift from 1st to 3rd, it shifts really hard. Right Chris?