Originally posted by Pyramid
There is a way to mod a little bit to make the diff runs much smoother without any grease applied. I think Goldfinger has more info about it.. which is the same noticable problem with the Xray T1 rear diff right before the EVO2 I believe (they changed the design I think).
Truly it was not my invention, it is coming from an Xray National Team-Driver and the funny thing is he was not even finish building 710 yet.
Basically he was trying to make the diff working just like the xray diff. With 100% lock the diff is still very smooth and with no oil/grease inside the ball.
Here is the list
- using correct mounted stone, open the left axle ID (where the thrust bearing lies) a bit till enough clearance with inner(6mm ID thrust bearing plate). Why ? the thrust plate is scrub the inside hole a liitle thus make your diff feels gritty even with new balls.
- with the same stone, grind the inside part of the snap ring (both eye). Why ? it is too close with the right axle OD. Too risky when dirt coming in.
- Find 9x12x4mm BB, it it hard 8x12x3.5 is easier to find. Together with your diff pulley and right axle send it to a workshop and tell the machinist to fit it in between.
- do a break in job after you finish building it. Hold the left axle and pulley together and use allen wrench to turn the right (locking) set screw and vice versa. Use thick/welding gloves.
Now you have a bulletproof diff !
And last night i was dreaming that serpent is releasing this diff as an optional part.
I believe this mod is unnecessary for those "fast guy" but worked very well for me.
Im a "D" main national driver (last year) and making 15laps in our national track is really hard but last week while using "this" 710 i can make 17 laps very easy and suddenly I was hang in A7.
Good Luck with your new diff and enjoy racing !!
I attached a Xray diff so you have a better imagination. Im planning to buy a decent cam, so I can post my diff photo.