apex128

Hello,
I have been trying to install my ES subframe and differential bushings and it has been giving me a lot of trouble. All the bushings went in easily, but when it was time to reinstall the differential into the subframe, one of the holes simply would not line up. It was very close, but I could not get the bolt in. To make things worse, both bolts and their holes holding the diff to the subframe are now stripped out, and it is very difficult to get the holes to line up in order to bolt in the diff. Basically what I want to know is if it is okay to just drill through the subframe and put a nut on the end on the other side. Would this be strong enough to hold the diff securely? What other options do I have? The holes I am talking about are pictured below.