[lincpimp]

Ok, the tdr mount and single speed adapter are top notch. I use both and would not hesitate to buy them both again. Nothing from tekno will fit next to the tranny.

You will have pinion issues with the 59t spur, stick with the 63t spur and you will not have clearance issues. I think a 25t pinion was the smallest that could be used with the 59t spur and the tdr motor mount. Go to the 63t and you can get down to a 22t pinion. Not alot of gearing options unless you go with the tdr colleted pinion adapter, as setscrew pinions only go up to 25t. Picking the correct motor/battery combo is very important.

I have the al cups and tin coated gears in my diffs. Never had an issue.

If you plan to run a medusa get the rcm bolt on front cover. The medusa motors have weak al front endbells and the screws strip very easily.

I run a 1521 1y on 6s lipo with a MMM. With 23/63 gearing, swapped single speed internal gears, and 6" tall tires I do about 40mph. 5s will not be enough, and I doubt the quark will like you much either. Unless you go with 2p on the a123 cells they will not work well either.