70 dart 470 ci drag car build.
I must have read it wrong when I was going over my safety requirements.
This is straight out of the 2024 NHRA rulebook and it looks like 10.99 and faster requires trans shield or blanket type shield as long as it is SFI 4.1 which is what I thought but once you go 9.99, a flexplate shield is also required. The trans shield or blanket is still required unless you have an SFI case. For some reason I was under the impression the blanket wasn't good for 9.99 or quicker.
TRANSMISSION, AUTOMATIC
Spring-loaded, positive reverse lockout device and functional
neutral safety switch mandatory. Transmission shield meeting
SFI Spec 4.1 mandatory on any car running 10.99 (*6.99) or
quicker or any car exceeding 135 mph. Automatic transmission
flexplate meeting SFI Spec 29.1 and flexplate shield meeting
SFI Spec 30.1 mandatory on cars running 9.99 (*6.39) or quicker
or any car exceeding 135 mph. See General Regulations 2:12,
2:14.
General Regulations:
10.99 or quicker
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.
9.99 or quicker
Comp, Super Comp, Super Gas, 9.99 or quicker E.T. cars, and
135-mph or faster E.T. cars using an automatic transmission,
Lenco Drive, or BRT must be equipped with a flexplate meeting
SFI Spec 29.1 and covered by a
flexplate shield meeting SFI
Spec 30.1. Transmission that can utilize a high-gear transbrake
must be supported by the use of two momentary buttons
(one to arm the system, second as the main transbrake). Air
shifter bottles must be stamped with DOT-1800 pound rating
(minimum) and be securely mounted (i.e., no tie wraps or hose
clamps).