-and here is "another two cents worth:"
Yes, there are threaded bolt holes down behind those three slots. But, my 1999 GM Service Manual says, 1/4" bolts, and my personal experience is this: I used three 3.5" long 1/4" FINE THREAD bolts with my three-slot puller, and it worked perfectly. (I don't think they are metric). Also, I found that using penetrating oil on the bolts, and running them in and out of the holes a few times first, before using the puller, sure did work good. It cleaned out the holes, so as to not ruin the threads.
Also, I tried to use an air impact wrench at first (-before I read the book) and it didn't work. And actually, I think it may not be the wisest thing to use an impact wrench anyway. Just think of the shock you are transmitting down the crankshaft, directly to all of the connecting rod bearings, wrist pins, pistons, rings, timing chain, etc. (I seem to remember that some engine assembly books warn against using a impact wrench on the crankshaft bolt just for that reason.) -but I've done it anyway,,,on many engines,,, Oh well.
So, I removed the silly little plastic guard covering the lower part of the flywheel (starter ring) teeth (-other end of the engine) and used a pry-bar in the starter ring teeth to hold the crankshaft. (a large screw driver would work just as well). Of course they make a "flywheel turning tool" which would probably work the best, but I still don't have one. -just have to use cave-man method- And oh yes, I broke that dumb little plastic flywheel teeth guard, so needless to say, I haven't bothered to get another one. (think I'll just leave the flywheel teeth "air cooled.")
Dark Cherry 99 Bonneville SE -her car
Ivory 02 Bonneville SE -MY CAR !
"luxury with attitude"