I put a 97 3.8 that came from a automatic firebird into my 97 firebird with a manual transmission. Now I have a bad vibration throughout the car even while car is just sitting and idling.

The 3.8 that came out of my 97 5 speed had a totally different harmonic balancer that looks more like a 98-up one.

was there a difference between automatic and manual harmonic balancers and that is why this one looks different?