[Lew Silverman]

Chuck,

The Quick Reference chart lists Section 20 (General Regulations) Paragraph 2:14 Transmissions

All vehicles running quicker than 10.99 seconds (*6.99) or faster than
135 mph (except some Stock and Super Stock classes as noted
under Class Requirements) and using an automatic transmission
must be equipped with a transmission shield meeting SFI Spec 4.1
and labeled accordingly. (“Blanket”-type shield, appropriately
labeled as meeting SFI Spec 4.1, permitted.) All non-blanket-type
shields must incorporate two (or one, per manufacturer’s
instructions) 3/4 x 1/8-inch straps that bolt to the shield on each
side and pass under the transmission pan, or transmission pan
must be labeled as meeting SFI Spec 4.1. Permitted in all classes
where an automatic transmission is used.

There is no specific mention of a Automatic "transmission shield" in the Stock Class rules, Section 10A.

Lew