Excel24

My Feedback: (3)

I have a Mammoth and it used to change into second gear but is not now. It's only running in 1st. Has anyone esle had this problem? Any Help? I slowed the truck way down to make sure, and looked in the book to how to adjust it but I can't find it on the truck! What makes me wonder is it was changing perfect before, nothing was touched, and now it doesn't change.

oatmealman

My Feedback: (1)

i had a few freinds with traxxas happens to them alot.he told me he would just let it sit for a while and it work. it might be a engine problem maybe your trucks not getting enough rpms to shift.

Sweetshoes90210

You need to loosen the spring tension on the shift finger. To achieve this, you need to loosen the setscrew with a wrench. Turn it a little at a time until desired shifting is obtained.

If YOU install a 2-speed onto the truck it was not designed for, then chances of 9-10 it may not shift. This is due to the fact of different gearing combinations being used for different cars. One example of this would be installing a 2-speed designed for a rally car onto a MT. In most cases, it will not shift.

Sweetshoes90210

Anyone agree with my post?

I am almost certain that is the problem, but then again is it possable to be 100% correct?

nitromacguyver

ive never installed and 2 speed in a single speed truck but i would think that it would just be a matter of getting the gearing correct.

jefx

Sweetshoes, you may be right, but I think the Mammoth comes with a 2-speed tranny.

Excel24, you need a small allen wrench. The set screw should be right on the metal rim of the smaller of the two tranny gears. Once you have it adjusted right, place a drop of threadlock on it to hold it in place. There is a picture of it in the feb. rcca.

fastfred

My Feedback: (4)

I've installed a 2-Speed truck tranny into my Super Nitro Rally. Shifts fine, but the gear ratio is all wrong, too low. Waiting on the adjustable engine mounts now, then will re-gear and see how it goes.

m

GotSavage?

It could be as simple as a tuning problem. You engine tune will change day to day depending on the temp and humidity.

jefx

Absolutely, if your engine is running too rich (or even too lean for that matter), it may not be building up enough rpms for 2nd gear to engage.

oatmealman

My Feedback: (1)

jefx agrees with me,yeah!!!!