Whats that screeching noise from my automatic tranny on hard shifts?
If you’ve ruled out that it’s the rear tires chirping, then it’s most likely belt slippage. This is common on the Corvette LT1s and even some of the later L98 motors. On hard shifts (auto and manual trannys), the shift in the speed of the pulleys will throw the belt and hence the screech of it slipping. It’s pretty harmless, although it can be annoying. You can check with your dealer as there is a Technical Service Bulletin (#476109) which calls for replacement of the belt tensioner with an improved one (part #10238703). Some people have also replaced the A/C pulley, (part #2724717) and the belt (part #12550149). Others believe the power steering pump pulley to be the culprit. The do-it- yourself solution is to raise the vehicle and support it with jack stands (or ramps). Either look to make sure you have an under hood sticker that shows the routing of the belt or make yourself a picture. Then get under the car and use the appropriate socket and “tighten” the center bolt on the belt te
