Re: 3sp to 4sp manual
Seems clear enough to me:
TRANSMISSION, Manual
OEM or NHRA-accepted aftermarket transmissions having same
number of forward speeds (O.D. gear not required) as original, and
reverse, may be used. All gear changes must result from direct
action by the driver. Pneumatic, hydraulic, electric, etc. shifters
prohibited. Floor-shift conversion kits permitted. Clutchless
transmissions prohibited. Clutch must be used to change gears in
a conventional manner. See General Regulations 2:12.
It doesn't make sense to me that stick should be treated differently that automatic in this regard, so I wish you all luck in getting it changed.
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