Ofna 51 spur and slipper kit ?

[makana59]

Heys guys,

Back ground. Emaxx, 9L BL motor feirgo, and 9920 controller, ultramaxx idler, rd logic cvds and UE center cvd, 5mm pinion gear

If I order the nylon 51 tooth spur and slipper kit...

1. do I need to purchase the sprong kit for it to work? they are currently out of stock thats why.
2. if I do end up getting the sprong with the kit later is this set up really good where I PROBABLY wont need to buy another spur gear again?
3. or will it be like the stock spur and burn up?
4. just want to know how to get a good spur....
any suggestions?

thanks for the help guys,
Makana