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If it happend that fast i would almost bet 100% its electrical.I have an air compressor. I'll blow the trans connectors out tomorrow the first chance I get, ill see if there is water in there then. I don't think it got high enough to wet the coil but I'll check for water. Its not 4wd and the rear end needs changing anyway but that wouldnt cause a problem would it, not immediately i mean. The more I think about it, trans connectors seem likely. I was worried i really screwed up something. I feel better now after checking the fluids. Also, could it have gotten into the torque converter, would that cause an immediate problem?
Just to clarify, the shuddering started immediately , like 30 seconds, after going through the water. Water getting into the engine or trans or torque converter or rear end would take longer than that to manifest itself wouldnt it. Thanks for the responses.