MIP SP1 DIFFS

[esprit79]

anyone have any info on how to service an MIP SP1 transmission? picked up a used transmission and the diff doesnt feel right, i also dont know if the brushless motor im running is the cause

[scr8p]

i don't know if you have the gear diff or ball diff, but here ya go.................

http://www.rc10talk.com/viewtopic.php?f=7&t=650

http://www.rc10talk.com/viewtopic.php?f=7&t=652

http://www.rc10talk.com/viewtopic.php?f=7&t=651

[a01butal]

I just picked up 2 MIP diff's and in both cases they were almost impossible to turn and after cleaning and replacing the balls they were not much better. The problem is that they were not taken care of properly, the faces of the diff have a groove ground into them and I'm not sure it can be restored enough to ever have a smooth movement. The best route is to replace part sp-16 and sp-17 but they are almost impossible too find, rarely come up on eBay. I got the 2 diff's for $25 so I guess you get what you pay for.

[esprit79]

thx guys this will help me lots

[a01butal]

I found after closer examination that it was not SP-16 and 17 that needs to be replaced in both but the B-6 where the small ball bearings sit and the B-7 thrust washer. I suspect they got so hot they just galled up the metal so bad they were close to welding themselves solid. That is why I would be leery of running a brushless lipo setup with the SP-1 trans.

[esprit79]

cool thx i will have to think about that being the 6 gear slipper last about 30 sec.-2 min

[esprit79]

here is a pic of the insides( from the ebay auction i got it from)