Greetings!
I too had the same problem. I had to put all bolts back in again and tighen.
Then, I soaked with PB Blaster a couple of times to ensure it fully
penatrated. In the end, it came down to the size socket and wrench
I was using. If you have been using a 3/8" handle with a six point,
5/8" socket, you need to increase the wrench size to the 1/2".
These larger bolts require greater torque and leverage to break free.
I have the Craftsman 200 pc Mechanics tool set and found I did have the
1/2" wrench but not a 1/2" - 5/8" socket. I went to Sears and bought the
$6.00 1/2" 5/8" six point socket. It was the best $6.00 I ever spent.
Like the 1/2" socket wrench handle, the 1/2" 5/8" socket is considerably
more robust than the 3/8" handle and socket. It gave me a greater lever
and added strength. However, I still needed more leverage. I found that
the breaker bars at Sears were either too long or not long enough. I looked
across my garage and noticed my 3 Ton Sears jack had a 2 piece handle.
After removing the attachment bolt, I realized it was hollow.
My 1/2" wrench handle slipped into it perfectly. It allowed me
just enough room to work with. Laying on my back under the car,
ratcheting the handle up a couple of clicks, and firmly gripping the nut
with the socket, with a steady pull she finally broke free.
