Before authorizing any transmission repair, ask if they plan on replacing parts and where those new parts will come from. If they’re rebuilding the existing transmission or replacing it with a new one, ask what the warranty is.
An industry standard warranty is 12 months or 12,000 miles (whichever comes first), but you may be able to purchase an extended 24-month/24,000-mile warranty or even a 3-year/36,000-mile warranty.
You can also ask if your transmission specialist is a member of or certified by the Automatic Transmission Rebuilders Association.
No matter what, make sure you ask any questions about the repair process before it takes place, and that the shop leaves you with a good feeling about trusting them with what could be a costly repair.