transmission downshifts kinda weird

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Posted by mitch ( on 10:54:07 07/30/07

hello again folks. i'm the guy with the electrical gremlins from a while back. new ignition switch was the fix for them. oh this is on a 99 tahoe. sometimes while traveling at hiway speed (after trans has shifted into overdrive) if i step on the gas kinda hard it feels like the transmission is trying to downshift, but can't quite make it happen. while this is going on, the tach jumps up like it goes back to 3rd then falls right back down. vehicle is jerking so to speak while this is happening. doesn't do it unless in overdrive. is there a common problem here? an adjustment maybe? sensor? thanks in advance, mitch

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