you dont need a big bolt. there should be like a little 1/4 inch nut or something on the back of it to help with the banging around while it starts. putting a bracket towards the front of the starter wont really fix the problem at all as the back will still swing around.

try using youtube to upload a video they are pretty easy to work with

 

make a photobucket account, and upload the video on there

 

Here is the first video I tried to send put through you tube. Http://youtu.be/49mqULHX_Pw

 

So your saying that the smaller bolt on the back of the starter is strong enough to hold it in place but all I have is 1/16 inch thick plat steel and a mig welder. I have also tried putting a ring around the back of the starter and welding it to the frame but that would cause the starter to come out of line as the motor rocked during starting. I have the truck up in the air pass side tire off and I can see the motor mount and the back of the starter but how would I mouth it. As I have been working to repair that broken hole it has only gotten worse. I see a for sale sign for this truck in the future. But I can't buy a new block

 

Is there any way you could give me a general idea of the mesurments and what bolt you used Too mount to the Block or mount?

 

so I took the time to Mock up make and mount a bracket to the motor mount from the small starter bolt and still grinding/ chuncking and not starting. what Am i missing.

 

Flywheel. You sure you have the right flywheel? The 4.3 comes in a variety of GM vehicles, full size rigs have a different flywheel than the midsized rigs. If memory serves me right, they also have a different tooth count. Thinking one is 51 tooth and the other is 53. Its been a couple of years so those numbers may be off.

 

damn man, I saw metal shavings flying off, that is not good, I wish I could help man.

 

I was going to mention the possibility of the wrong flywheel.

 

The simplest way to count flywheel teeth is via the access hole, or remove the starter. Use some fingernial polish, or white out and paint one of the teeth. Use a long handle pry bar and slowely roll the flywheel one revolution, count the teeth. If your like me, you may have to mark a few along the way.