To sell or not to sell

[lottathought]

I have been debating if I need to sell my Explorer for a while now.
I have a 99 XLT 4X4...
At around 60K, the tranny had a serious issue and had to be rebuilt.
The price tag to that was 3,500 dollars. Fortunately it was under warranty and I only had to pay 25 dollars.

It made me think of what would happen if the tranny ever went out again and was not under warranty.

I am now facing 100K on the Explorer. I looked thru this site and there seems to be quite a few Explorer tranny issues.

If I am only 20K away from another rebuild, then perhaps it is time to sell.

How common is it to have a tranny problem on these vehicles?
Is it a bad design or is there something else causing the trouble?
I suppose what I am really wondering is if the trouble that I had before was a-typical for the Explorer and the rebuild corrected the issue.....OR...if the rebuild, because of the design, will tyically last no longer than the original tranny lasted.