I have a b7100 that cranks over like the starter is about toast. I pulled it apart and it looked good. I already ched volt drop amd all that stuff. My question has anyone ever put a gear reduction starter on these. I know most small diesels run a denso style starter. I tried one from a bota reefer motor but the starter flange was too wide. I think some of the d950 motors ran a gear reduction set up