Big Twin 4 speed transmissions have been built since 1936 in several versions. They were included on bikes with Knuckle engines, Pans, Shovels and some '84 and '85 Evolution 80's. They all used this transmission. With Andrews 4 speed gears, transmissions last longer, shift faster, and just plain run better. Bikes with Andrews gears feel so good that it’s hard to believe until you experience the difference for yourself.
(A) 2.44 1st Gear Set (1959 thru 1984)
Part #201105 Best choice for SuperGlides, choppers and lighter bikes with
stock or smaller motor or trans sprockets. This is a ‘no clunk’, 48 mph, 1st
gear. Installation in '80-'84 FX requires a 21 tooth 2nd gear. (17T & 20T on
cluster; 24T on counter gear.)
2.60 1st Gear Set (1959 thru 1984) (Not pictured) (24T & 16T)
Part #201145 This gear set works best with “E” glides and heavier bikes with
motor or trans sprockets having more teeth than stock sprockets. Installation in
'80-84 FX requires 21T (1.82 ratio) 2nd gear for this 1st gear. (16T & 20T on
cluster; 24T on counter gear.)
3.00 1st Gear Sets (Original stock ratio) (Not pictured)
Part #201090 (1959 thru 1984) (15T & 20T cluster; 26T counter gear)
Part #201094 (1936 thru 1958) (15T & 20T cluster; 26T counter gear)
Stock ratio first cluster-counter gears. '36 version has no rear counterbore and
requires short length 3rd main gear, Part #206215.
Combination 2.24 1st & 1.65 2nd Gear Set (Not pictured)
Part #201020 If you want peak RPM through the quarter mile, this gear set
will provide the super close ratio shifting to handle it. OK for street or drags
with any size motor.
(B) Shift Forks
Part #209750 (1-2 fork) (Replaces H/D #34159-36)
Part #209760 (3-4 fork) (Replaces H/D #34158-36)
One piece cold forged forks. Fully heat treated and black oxide coated, a must
for all transmission rebuilds.
(C) Shift Clutches
Part #205120 (1-2 clutch) (Replaces H/D #35665-36)
Part #205340 (3-4 clutch) (Replaces H/D #35440-38)
Replacement clutches are specially heat treated and shot-peened for super
durability. 3-4 clutches are face milled and have longer lead in ramps for more
positive shifts.
(D) Stock 2nd Gear (1.82 Ratio) (21T) (Replaces H/D #35751-36)
Part #202160 Stock 2nd gear with drive slots include lead in ramps for more
positive 1-2 shifts. This 21 tooth gear fits 1941-1979. It will also fit later
transmissions but requires one of the first gear sets shown above.
(E & F) Close Ratio 3rd Set (1.35 Ratio (18T & 23T)
Part #203365 (early) Transmissions built before mid '76, to serial #U-8958
(or lower) with loose needle bearings.
Part #203375 (late) For transmissions built after mid '76, from serial
#U-8959 (or higher) with caged needle bearings. New design drive slots include
lead in ramps for quicker, more positive shifting (same as stock 3rd and 4th
gears).
(E & F) Stock 3rd (1.23 Ratio) (Not Shown) (17T & 24T)
Part #206220 (Replaces H/D #35306-59) (Mainshaft 3rd)
Part #206215 (Replaces H/D #35306-36) (Mainshaft 3rd) (This gear
requires 1936-1958 style cluster gear)
Part #206330 (Replaces H/D 35700-36) (Cluster: '36-'76)
Part #206335 (Replaces H/D #35700-76) (Cluster: '76-'86)
Replacement for stock main and countershaft 3rd. The design of drive slots on
mainshaft gear has been upgraded to include lead-in ramps for quick, more
positive shifting.
(G) Stock Main Drive Gear (4th)
Part #204260 (1936-1976) (26 Teeth) (Replaces H/D #35065-65)
Part #204280 (1977-1986) (26 Teeth) (Replaces H/D #35067-77 and 35067-84)
Replacement 4th gears are made with wider drive slots and steeper lead in ramps
for more positive 3-4 shifting. The "O" ring groove is a design update for all
chain drive 4th gears from 1977 through 1984.
(H) Transmission Mainshafts
Part #208500 (early) (Replaces H/D #35040-50, 1937-1964)
Part #208650 (mid) (Replaces H/D #35039-65, 1965-1969)
Part #208700 (late) (Replaces H/D #35039-70A, 1970-1985 chain
Part #208800 (late) Replaces H/D #35039-85, belt drive, Late 1984-'86)
Replacement mainshafts for all versions of big twin boxes. Made from aircraft
alloy steel. Heat treated and finish ground to ensure maximum durability.
(I) Transmission Countershafts
Part #207650 (1941-early 1976) Replaces H/D #35614-65)
Part #207770 (Late 1976-1979) (Replaces H/D #35614-77)
Part #207800 (1980-1985) Replaces H/D #35614-80)
Three types of countershafts fit transmissions through 1985. They are not
interchangeable, so make sure before you order.
(J) Transmission Rebuilding Kits (Small Parts)
Kit #210925 (1936-1976)
Kit #210950 (1977-1979)
Kit #210975 (1980-1984)
Transmission Gear Kits
Gear kits must be ordered by part numbers listed below which specify year
and 1st and 3rd ratios. Each gear kit includes 6 gears, 2 shift clutches and 2
forks as shown above. (Shafts and small parts kits must be ordered separately.)
Kit #210150 (2.44 1st, 1.35 3rd) (1936-1976)
Kit #210250 (2.44 1st, 1.23 3rd) (1936-1976)
Kit #210350 (2.60 1st, 1.35 3rd) (1936-1976)
Kit #210450 (2.60 1st, 1.23 3rd) (1936-1976
Kit #210550 (2.44 1st, 1.35 3rd) (1977-1984)
Kit #210650 (2.44 1st, 1.23 3rd) (1977-1984)
Kit #210750 (2.60 1st, 1.35 3rd) (1977-1984)
Kit #210850 (2.60 1st, 1.23 3rd) (1977-1984)
4 Speed Transmission Mainshaft Lengths
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Andrews Products makes four
different versions of 4 speed big twin transmission mainshafts. For everyone who calls us for transmission shaft lengths and asks us to look up blueprint dimensions, here they are! One additional mainshaft fits belt drives: H/D Part #35039-84. This is the same part as H/D #35039-85 except that 35039-85 uses a different drive key. It is very important that the correct drive key be used. The H/D part number for the drive key is #37523-85. The Andrews number for this belt drive trans shaft is: Part #208800. |
ANDREWS PRODUCTS, INC.
431 Kingston Ct., Mt. Prospect, IL 60056
Phone 847-759-0190 Fax 847-759-0848
andrewsproducts.com