that's a bit too much it has the motor maxxed out over the 35.000 it's rated for. even with the CC XL i dont want all that speed 50~55 was all i wanted from the start and i want to stick to my guns on this after 60mph anything can happen with something this large.

ok i ran it 14/48 and i was pleased around 57mph's but !!!! i can't put it on the motor would touch the drive shaft !!!!!!!!!! lose the wheels or find a bigger spur

Your right, just saying Mamba's gives you more than expected.

That's why I have an RC8T CD (54t spur) for my latest build with the 1717 if I need it - the diff itself is the same width as the Muggy/8ight diff, so it will fit in the Muggy mount.

I'm looking at using the 8ight-T 50t spur right now if I use smaller tires:

http://www.rc-monster.com/forum/showthread.php?t=29657

Your other option would be to run Muggy diff gears front and rear (45/11) which would also help your gear ratio - the problem is that those ring/pinion gears are getting harder to find.

Can you file down the fins on the motor to make it fit? That might be your easiest fix.

UPDATE !!! i have the 50 spur and 16 pinion installed on the truck i really want to drive it but i haven't made the cash to get the Big Dog !! CC XL So.... would it be stupid to try the Rx8 if it arrives before i get the castle ? i did drop 5 teeth in total ! i geuss i could run the 40's till i get my esc but the B5's look so cool.

Did you check your new top speed? It's still higher than I'd run with something this heavy on an RX8. But you might get away with it if you keep an eye on your temps.

I was thinking about looking into the AE center diff so i could run the 54 spur i just noticed your post about the size issue i don't want to fight with a dogbone problem while gearing is wopping on me also so that would be heaven sent if i could use one. i wanted to know before i headed out to blow some cash is the ae diff gonna use the same bearings or will i have to order some from vbx vxb i can never remember there name.

The AE CD uses the same bearings (8x16x5) so that won't be an issue.

UpdateUpdate!!!! i just horse traded my way into a MMM esc and Tekin just shipped my RX8 i found a complete ae diff and spur 55 bucks so i'm wasting cash at a fast pace but what you think ? ae diff/MMM ?

I'd start with the smallest pinion that would work with the 54t spur and see how it goes - you can always gear up if your temps are OK.

Here's what the calculator gave me for the 54t spur and the following pinions:
10T 36.22 mph
11T 39.84 mph
12T 43.47 mph
13T 47.09 mph
14T 50.71 mph
15T 54.33 mph
16T 57.95 mph
17T 61.58 mph

Im back with the esc and i'll check to see if the diff is in stock at the hobby store and ill be a bec away from testing, the 54 seems to be on the money !

Well Happy to report my truck is back together and i was happy to see they had the 54 spur and diff in stock i forgot the pinion so i ran the 16 and the truck was nice i only had a 4cell charged so i ran that and it seemed to want to top out or close to it. considering it's dark and i didn't drive the truck more than 150~175 feet away but i did drive at 80% was kinda rough on it and the fan never came on but at power up. i checked mid run to see if fan worked and it did but was not on. Motor was warmer than before but i geuss thats due to getting more rpm's nothing hot just warm. all in all i'd say she's fine now. Thanks Brian this truck means alot to me and it looks like i'll be bashin with my bud's in the am ! thanks again Nick !! P.S. i will be going to a 14 before i run 6s.:party::party::party::party::party::mdr: