4L80E is closely related to the TH400, but on top of the turbo 400's 3 gears it has a fourth (overdrive) gear. It's an automatic.
EDIT - you may run into trouble if you try to stick a 4L80E in that truck. If I remember right it's electronically controlled and runs off the engine's computer. If you don't need the OD, a TH400 might be the better option of the two.
So, yeah. If you want a new tranny other than a 700r4 I'd say your options are a TH350 or TH400. I'd go with the 400 because it's tough as all hell, but if you're leaving the engine stock and don't plan on driving it too hard the 350 might be the better choice.
Last edited by Martian; 05-02-2005 at 11:11 PM..
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