I just changed out the gears in my savage. I ran 2 tanks and it all seemed fine. Now though, my front tires seem to move really fast while my rear are totally doggin. I'm not sure if it has anything to do with the fact that I changed out the gear of if something just simply became loose in the process of bashing. Do you have any suggestions?

If its only the rear acting up then take a look at 2 things. Firt make sure the grub screws are in place for the 2 drive cups in the rear, one on the tranny and the other on the diff. If these are in place then you have to open up the diff and take a look there, it could be either the outer 13t and 43t gears or the inner spider gears.

If you dont have any alloy diff cups then you should get some to avoid this kind of problem in the future.

check the center dogbone pin and then check the cup u most likely twisted the cup and now u broke the pin in the dog bone

The setscrew(AKA grib screw) known as 86094 is the culprit 9 times out of 10. Check the rear of the tranny where the brake disc is, look into the center rear dog bone cup that mounts to the rear output shaft, and check to see if that stupid setscrew, 86094, is still there. If not, but a bag of replacement 86094's and replace, very simple.

If its is not 86094, check the other setscrew on the other end of the cebter rear dogbone that goes to the rear diff. This setscrew is called 86095. If that is still there, you will have to remove your rear diff and inspect the bevel gears.

To quickly rule out stripped diff bevel gears, roll your Savage on the ground forward and backward by hand. If a really loud "click!click!click!" issues forth, the 13T/43T diff outer bevel gears are stripped and/or the spider gears inside the diff cup are stripped.