hi what is a 5/4 ? what model FLH ? . the 1st gear in early FLH like shovel's had a very high numerical 1st gear strong take-off but slow on speed or distance , we normal use a super glide FX 1st gear opp , on 4 speedercheck out your engine sprocket teeth numbers ? 1st , but normal is about 23t/49t stroker shovel 86c.i. on a bike with broard spreed of power 4 gear.'s is enough 5or more is just for the EPA man
5/4is a revtech 5 speed in a 4 speed box and its a late 79flh