Straight Transmission and Manifold

1995 Jeep Wrangler 4 Cylinder Straight Transmission ~ purchased new. 1. 5th gear was known to be defective andc I paid a small fortune for what was considered a "Correction Kit" and rebuilt transmission. Jeep denied knowledge of the problem even though they sold the "Correction Kit" ! Is this a weakness that will rear it's ugly head again?

2. The exhaust system was known to collapse on itself and after the third replacement I finally found a custom shop that corrected the problem ~ Jeep denied knowledge of the problem ! ( More for your record than anything else )

3. Bolt snapped from manifold which is also a recognized and known problem~Jeep again denied knowledge of the problem ~ I have exhaust noise coming from manifold for about a minute until metal expands when warming up on Winter mornings. Can this be drilled out and new bolts installed with good results and if so how much should that cost in the Richmond, Virginia area?