Stafford Motor Speedway has made the following additions/changes to its SK Modified® rulebook effective immediately.
20E- 10.4 TRANSMISSION -
A. Only OEM production stock 3 & 4
speed transmissions with OEM production gear ratios or Richmond 2-speed transmissions as produced by Richmond.
Modification of the dog-ring and slider only of high gear only, in Richmond
2-speed transmissions is permitted. No other modifications of any kind are permitted.
The 2-speed Richmond transmission is the ONLY aftermarket transmission allowed.
The following Richmond 2-speed transmission part numbers are the only approved
part numbers: 7020010X,
7020026X, 7027010X, 7027026X, the X representing Richmond’s ratios
letter designator. The following Richmond produced gear ratios are the only
approved ratio for use in the Richmond 2-speed transmission: 1.2250, 1.3391, 1.4588, 1.5956,
1.7442. Top loader transmissions are not permitted.
B. OEM
Stock cast iron, aluminum or magnesium transmission housings, or the Magnus
part number MRPSA-1009 housing are permitted. The OEM Stock transmission
side covers must be used.
C. Only OEM type, steel, angle cut forward
gears are permitted in non-Richmond 2-speed transmissions. Square cut forward
gears are not permitted, except in the Richmond 2-speed transmissions
D. 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. Five-speed transmission, with gears
removed is not permitted.
F. Quick change transmissions is not permitted.
G. Automatic or semi-automatic
transmissions is not permitted.
H. Machining or lightening of any internal
rotating or non-rotating parts including gears, shafts and case are not
permitted. Gun drilled transmission shafts are not permitted. Welding on any
internal part will not be permitted.
I. Additional or different from OEM bearings
other than the tail-shaft, which may have roller bearings, are not permitted.
J. 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.
Cc:
Tom Fox
Jay Shea
Chuck Zentarski
Mark
Arute