i have 3000,5000,7000 diff fluid which would be best?

Most that are using the slipper will use 5k in the rear and anywhere from 10k to 30k in the front.
I think AE suggests 20k in the newest print of the manual.

Those running the center ball diff are running 5k rear and 5k to 7k front.

I also have these plus 10K.

I am using 5k rear and 10K front with the VTS Slipper and stock pads. When I get my V2 Center Diff I plan to drop the front to 7k or 5k. It all depends on how your truck turns, brakes, and provides power.

Correction, new manual suggests 30k.
Before the C-Diff I ran 10k in the front like shortcourseonly is because of a 3.5° rear toe setting and outdoor track conditions to get more steering.

Humm..I was told I had no clue on gearing when I suggested 62/13..I was told that it was to small of a gear to run on a 550 can motor..so..WTF..

Is the same gear I am using ....(Reedy 550 4.5)

I'm not sure what your referring to, but I run 13/62.
However, 13/62 is not always the correct gearing for all 550 motors and all tracks... but with your post count you already know that.

so the 3000, 5000, 7000 differential fluids that i have at home will not work for the differentials if i am hearing you guys correctly?

Hey..hey..I was told the manual is WRONG..and I got chastised for bringing it up..maybe a week ago..this was on gearing and suggested ride height..so be carefull getting "stuff" outta the manual..maybe a stickey on what part of the manual you can "believe" and what parts BS..some of us are new to the platform so we don't know..FUM

Yeah, coyote hates it when we mention the manual

But I know that even back when I picked up this truck 30k was the suggestion from many... AE just hadn't caught up yet.

When I got mine in October, the manual suggested 7k... So I don't go by that, just the build steps.
The manual is only giving one suggestion and it is not correct for all. I think it suggested 12/62 or something like that and that happened to be correct for the motor that I was running indoor, but I needed a 13 outdoor so it was not correct in that case.
Now I'm 13 everywhere with a 4 pole motor

Huh, I googled FUM and I found Family United Meeting.

Are you suggesting we all get together and give you a hug for the flaming your recieved?

I was running 62/12 onm y Ballistic 550 4.5t and just increase to 13t. I will be running large 8th scale tracks so I think this should work fine. The person telling you that you had no clue, has no clue.

Hey whoa. What? Before you start with that crap, Get your people right. I was not involved with that manual stuff.

im running 30k front and 3k rear and i like it. as far as gearing im running 14/62 with a 4 pole castle 1410 motor.

I need some 30k oil maybe. What front diff oil are you using with the V2 center diff?