Perhaps you have heard of the common TR250/TR6 differential-mount weakness. We have repaired some of those and will try to illustrate the problem.
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The above picture depicts the problem. Over the years, stress to the mount weakens it and it cracks. It’s a weak point. That split at the bolt is not supposed to be there. What we do is weld it back together and then add metal to box it in and make it stronger.
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This picture shows how we get to the top of the mounting point without removing the body off of the frame. The stress on the mount causes spider cracks (or worse) on this side.
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This last picture shows the mount (different TR6 in the picture) re-welded and new metal added on other other two sides to “box” it in and strengthen it. These mounts are great items to put on the checklist if you have or are in the market for a 250 or 6.