Reverse gradually fades to zero
When I start my Craftsman Mower Model 917.289240, full forward speed is about 75%, and just nudging the shift lever past neutral makes the mower shoot backwards at a nearly uncontrollable speed.
It takes me about 45 minutes to finish my lawn, and in that time, reverse gradually fades to a crawl - forward speed stays about the same.
In between, pushing the lever all the way reverse gradually gets me less and less speed, but if I leave it there, the full 'rocket' speed will eventually kick in. By the time I'm done, it won't do that. Reverse is a very slow crawl, no matter how long I wait.