Recently, a number of 8-speed and 10-speed transmissions have been returned to the Warranty Parts Center with missing or unreadable Transmission Unique Label (TUN) labels. In some cases, the label is smeared or distorted due to how the case was cleaned before shipping. (Fig. 10)
Fig. 10
The TUN# label (Fig. 11) identifies the transmission build and includes data for the valve body and Transmission Control Module.
If the TUN# label numbers and data matrix code cannot be read, the bottom pan of the transmission must be pulled to view the PUN# on the valve body in order to determine the model of the unit and correctly identify all components.
Fig. 11
Cleaning the Transmission Case
Before shipping the transmission, the case should be cleaned. However, use care not to get any cleaning solvent on the TUN# label and the surrounding area. The TUN# is located on the side of the transmission near the lower edge of the case. (Fig. 12)
TIP: When cleaning the unit, do not use any chemicals to wipe away dirt or debris on the TUN# label that may smear or remove the ink on the label. Brake cleaner or other solvents should not be sprayed or wiped directly on the TUN# label.
Fig. 12
– Thanks to Mark Kevnick
How about an engrave metal tag? or anything without removeable ink. Hyundai learned this several years ago. Makes it pretty tough to do your job when it comes IN with most of it already missing