[89IROC&RS]

gearbox??? is that the transmission???? if so, then yes, i would say that it is the trans, and the place that did the work dosnt want to fess up to it. get it in writing that if they are sure there isnt a problem, that they tested it and found nothing. was there a warrante on the work? if so, take it to another place for a check. if that place finds the problem go back and have the original place either fix it, or pay to have it fixed. i agree with cannibalrights that its not the waterpump, if it were, it would be due to drag on the pully, from inside the pump, and it is highly unlikely that it would actually slow the engine, it would more likely stop the pully and the belt would be pulled over it rather than turning it, and you would definately smell this if it were happening, and your belt would probly have snapped by now. but if the pully is turning freely, than its the gearbox. barring somethinge else that may ahve broke at the same time those two items were replaced. i dont have a code 28 in my book so im not sure what that means. but from what youve said, i would say its the trans, something wrong with it.