The achilles heel with the MO5 ball diff are:
The aluminium outdrives wear very quickly even with the blades, when these are done up tight. Need to change regularly. May only last 1/2 days racing. (This is achieved by using a 3mm screw and the TRF 416 nut which is rethreaded for this, also require a larger thrust bearing).
The diff nut, thrust bearing and nut are weak and only allow minium tightening of the diff. It is very easy to strip.
If you want a bullet proof MO5 diff you need to consider using the steel rally outdrives which require no blades attached to the end of the universals and doing the above screw/nut/thrust bearing mod. You will also need to modify the 416 nut to fit the thinner diff outdrive channel.
The easiest solution is to use the TAO3 ball diff and make sure that you place AW grease on the splines and also ensure that you use either two "O" rings in each diff cup or a small length of nitro fuel line. Make sure that when the front of the car is compressed that the universals do not bind on the fuel line or two "O"rings. Otherwise you will have some issues.
The other option is to use the gear diff and fit double washers each side to slow the action or find a slower acting grease. I have seen a "O" ring fitted in place of the washer but it involves more modification of the gear diff housing. The problem with adding more to the gear diff is that they can be notchy because of the pressure applied when the housing is tightened.
Next month 3Racing are releasing there new FF racer which will be fitted with a oil gear diff. This will only fit the MO5 I believe. Will have to wait and see.
We have found now that we are using the HW 13T BL systems that we wear through diffs and outdrives quicker than in the past. The main reason for this is because we tighten our diffs so we can get maximum drive out of the corners. A loose diff doesn't cut it any more. We have also found that most tend to drive there mini, similar to a mod, due to the extra torque when exiting corners.
Good luck with your diff solutions.
Regards,
Calvin.
Last edited by caltek1; 11-03-2010 at 01:37 PM.
Reason: xtra text