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Ok! Who has the TRX 2.5 or some other powerhouse of an engine in their truck? Hmmmm. Quite a few of you raised your hands. Listen up! The following information is very important and you will need to perform this upgrade...whether you realize it yet or not.

One of our trucks was treated to an engine upgrade (to the EPIC .18 Big Bore) and before long, we heard it. The dreaded clicking sound. When landing jumps or pulling wheelie's "click, ratchet clank". Urgh. It's time for a differential upgrade!

In my humble opinion, one of the weakest points of the Traxxas T-Maxx drive train is the differential design. The design is not terrible but could have been made so much stronger by the addition of two screws to support the input shaft area of the case. For those of you who have been paying attention to your parts breakdowns or have closely examined your diff's; you have noticed that there are only two screws on each differential case to hold the case halves together and they are located at the rear of the case. Under hard use, big power or extreme stress, the front (input side) of the cases will open up slightly and that changes the pinion gear mesh. If the pinion gear is not meshed properly with the ring gear, it ultimately causes premature wear and will lead to the destruction of your diff gears. With the stock gear case design, the input shaft area is held together by a plastic retaining ring that also keeps the differential in proper alignment with the transmission output.

Problem solved. GARC offers a bulletproof differential case design with socket head cap screws in all four corners to keep the case halves together, no matter what. The case halves are machined beautifully and fit together snuggly. Bearings squeeze tightly into place and ensure that shafts and gears stay aligned. The diff kit from GARC comes with the case halves, shims, hardware, aluminum retaining ring and o-ring. You will need two kits to do an entire truck.

We won't get into the details of a diff rebuild here but there are a few features that need to be pointed out about these cases.

1. The four bolt design - we already talked about the benefits of this. A must have design if you are dealing with power or simply want a better component.

2. Machining & Quality - these cases are machined beautifully, fit together perfectly and support their internal gears exactly. The bearings "click" into place, firmly and solidly.

3. O-ring and retaining ring - the input neck of the diff case has a machined groove that you install an o-ring into. You then slide the aluminum retaining/alignment ring over the output neck and o-ring. This provides an extremely tight fit and keeps even the outer extremity of the input neck tightly closed. Very, very nice feature.

4. 7075 Aluminum - this is super strong stuff. And the cases are lightweight. To be honest, we were worried about them being too heavy and it was not the case (sorry for the pun).

Our differential rebuilds went perfectly. These cases were a big part of that successful rebuild. So, what do 7075 cases of this caliber cost you ask? Much less than you think. GARC had these on their site for $75 with free shipping when we got them (yes...$75 for two sets, enough to do an entire truck). I have seen numerous other cases out there of much lower quality and with fewer features for more money than that. They are an incredible value to say the least.

A wise man once said "anything worth doing is worth doing right". Don't settle for less. Go to GARC and scoop up these case halves. You won't regret it.

Visit the Great Assembly RC web site.