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92 Should be a 4L60 is it's a half and 4L80 if it's a 3/4. Those years the FI ECM also controls the transmission. Bad ECM will cause them to shift bad. Should still have reverse and drive and usualy with a bad ECM it will try to start in 2nd gear.
Sounds like you lost the Sprag for the forward drive drum When that happens on a TH400 or TH350 you usualy find parts of the sprag in the pan. Not sure it that is also going to happen on the 4l's
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Grim-Reaper
70 Pontiac LeMans Sport Convertible, worlds longest resto in progress
Looking for 71-72 2wd Blazer or Jimmy Project
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