JoSeY

My 99' water pump has 4 bolts on the "Pulley" and I have a spare 01' pump that came off of a friends 10K mile motor when he put an electric on it. The pully's are quite different...the 01 doesn't have any bolts on it, it just looks like one big black "Bell"....are there any differences in the pumps internally also? My 99' just sprang a leak on the front seal and is leaking but still can keep my car at 180 degrees in traffic as long as there is water in the radiator...will I see much if any difference going to the newer style pump?