S&S Cycle All-Helical Transmission Gear Set Cassettes for Harley-Davidson 1991-05 Dyna, 1991-06 FLT and Softail models, and Custom Applications - Manual (Page 20)

20
TRANSMISSION SERVICE
NOTE: S&S recommends filling transmission with 20-24 ounces of 90 weight gear oil or equivalent.
1. Perform an initial fluid change at 500 miles.
2. Change fluid at 5,000 miles.
3. Service transmission fluid every 5,000 miles thereafter.
Gear S&S ® Internal Transmission Ratio
1st 3.882
2nd 2.656
3rd 1.941
4th 1.475
5th 1.179
6th 1.000
GEAR RATIO CHART
Recommended Final Belt Drive Gearing
● S&S recommends that you use a 32- or 34-tooth output pulley with a 65-tooth rear pulley.
● S&S recommends the use of our 34-tooth output pulley with a 70-tooth rear pulley.
NOTE: Installation of the 34-tooth pulley should not require a belt change. Changing the rear pulley from a 70-to a 65-tooth will
require a belt change.
Gear S&S ® 34T/70T S&S 34T/65T Stock 32T/70T
1st 11.510 10.688 10.112
2nd 7.875 7.313 6.962
3rd 5.755 5.344 4.946
4th 4.374 4.061 3.875
5th 3.494 3.245 3.150
6th 2.965 2.753 N/A
RPM @ 80 MPH
in Top Gear
3308 3072 3515
OVERALL GEAR RATIO CHART
The chart on the right compares the overall ratios of the S&S six-speed transmission
with the supplied 34 tooth front sprocket and readily available 70 and 65 tooth rear
sprockets. Also shown for comparison are overall ratios for a stock 1995-up five-speed
transmission from a carbureted big twin with the stock 32 tooth front and 70 tooth
rear sprockets. Note that first gear is lower (higher ratio) with the S&S transmission
even with a 65 tooth rear sprocket. Also note the reduction in engine rpm at 80 mph
in top gear.