I had this happen last winter after I put the engine back in my 51 GMC. I was able to pop it loose from underneath with a piece of angle iron and a hammer. You can get under the front and see of you have that access too.

1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed

My Chevy Master 4 Door is on the Road!