Whats Wrong with this GRU?

[MACK Daddy]

Originally Posted by Claus

Any threads in the mounting holes?

Bingo! Holes not threaded

Theres no way of mounting it unless I run a screw from the inside out and than attatching it to the tranny via a locknut

I am thinking thats the only way of doing it?


BTW, thats the set screw that was sent with the pinion from RC4WD... Go figure

Alfy

[ihbuilder]

OH , I thought they're intention was to get a longer screw and bolt everything together at once The screw going through the GRU to the motor from the trans

IHSteve

[CustomRCmodels]

Nothing wrong with it
That’s how these GRU’s are mounted : long enough screws to bolt motor and GRU to the transmission . Otherwise you would have to disassemble the GRU to mount the motor .
And the included pinion-gear goes on the motor-shaft , since upon depending which type you have here ( 2:1 , 3:1 , 4:1 ) the pinions are different sizes .
( I am assuming the pinion-gear you are showing in the photo came with that GRU )
And that the setscrew sticks out doesn’t matter , since that gear which this pinion runs against it is a very thin gear , means you have to do this very precise ( adjustment of the pinion gear on the motor shaft )