I need some help here. I bought a 1 inch offset rear end to run in our TQ. Problem is that it had a 3 inch offset before. When I try to install this rear end, the jacobs ladder extends approx 2 inches past the bird cage. Is the reason for this because the firewall has the engine mounting holes offset to the left, causing more axle length on the right side. Should I consider having a new firewall made with the engine mount centered. Any help would be appreciated.