The previous version of Technical Bulletin 12-05 has been rescinded as there was an error in letter B. This new TB-12-05.1 replaces the version that was sent out on Jan. 16. This change is effective immediately.
20E- 10.4 TRANSMISSION
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A.
An OEM Stock production “manual” 3 or 4 speed transmissions must be used. Top
loader transmissions are not permitted. Gear ratio must be of stock OEM
production.
B.
Only cast iron housings are permitted. Aluminum or magnesium transmission housings
are not permitted.
C.
OEM type, steel, angle cut forward gears are permitted. Square cut forward
gears are not permitted.
D.
The removal of first gear, or replacement of first gear with a metal spacer, in
4-speed transmissions is permitted. All other forward and reverse gears must be
in working order, and they must be operational from inside the driver’s
compartment. All transmissions must have a constant engagement of the input
shaft with gear and countershaft with cluster gears.
E.
Machining or lightening of any internal rotating or non-rotating parts
including gears, shafts and case is not permitted. Gun drilled transmission
shafts are not be permitted. Welding on any internal part is not permitted. External
oil pumps and oil coolers are not permitted.
F.
Additional or different from OEM bearings other than the tail-shaft, which may
have roller bearings, are not permitted.
G.
Auxiliary, over or under drive transmissions are not permitted. High gear must
have a ratio of 1 to 1 and no other gear may have a ratio higher than 1.20 to 1.
H.
Only fire resistant type shifter boots, secured with fasteners, acceptable to
SMS Officials is permitted. The shifter boots should must meet the SFI 48.1
specification and display a valid SFI 48.1 label visible on the outside surface
of the shifter boot. Quick release fasteners should not be used to secure the
shifter boot. The shifter boot, when installed, should be completely sealed to
the floor of the car. Installation of the shifter boot must be acceptable to
SMS Officials. Shifter boots should not be used beyond three (3) years from the date of manufacture.
I. Heating
pads, blankets or any other heating devices are not permitted at any time.
J. Transmission
vent/breather hose & filter assemblies must be located within the
transmission tunnel and must not extend forward of the vertical front firewall.
Remote transmission reservoirs and/or fill tubes are permitted. All
transmissions must contain a minimum of one (1) quart of lubricant.
Cc:
Tom Fox
Jay Shea
Chuck Zentarski
Mark Arute