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Print in friendly format Send this term to a friend  4L80E
Automatic Transmission - 4 Speed

1st Gear: 2.43
2nd Gear: 1.49
3rd Gear: 1.00
4th Gear: 0.75

Reverse: 2.07

- Used in production GM models...
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Re: Update On Grace's Rough Idle

Subject: Re: Update On Grace's Rough Idle
by bogus on 2018/7/28 20:22:10

I did a tune up on an LS1 about a year ago... that was a learning experience... All of my muscle memory was useless... the plug orientation is just different enough... drat.

Then there is the relief... there is a machined surface that the plug rests in... the problem? it requires a thin walled socket to get in between the plug and the elevated portions of the head. A real bitch.

What plugs did you use? Wires? When I do mine, I will use KGK or Denso plugs and MSD wires.

As for the rough idle still being there, how old are the O2 sensors? I would replace with AC Delco, Denso or NTK (kin to NGK). I need to double check the lifespan of the newer O2s... the old single wire ones were 30k replacements.
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