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simply the best custom performance parts

tom's custom performance Parts


ring and Pinions

Tom's Differentials Kits and bearings

kits, bearings+seals

Tom's Differentials


U Joints, yokes, pads

tom's custom parts

Tom's Differentials branded merchandise


Are you a Jobber or Distributor? signup for discounts and SAVE $$$

Simply the BEST Performance Differential Parts Store

Tom’s Differentials was established in 1975 by Charles “Tom” Watt in Paramount, California. In the mid-1990’s, Tom relocated to our current location in Ponderay, Idaho. Tom built his reputation by providing quality, custom aftermarket parts for classic Corvettes and drag race cars. Our products (and Tom!) have been featured in many automotive magazines, such as Hot Rod, Corvette Magazine and Drag Racer Magazine.
Here at Tom’s Differentials, we have always valued quality over everything else and will continue to do so without compromise.

ALL of our custom products are proudly made right here in the USA. When it comes to our other products, we stock USA made unless there is no other option. So, if you are interested in just so-so parts, you might not want to bother. Check through our vast inventory of custom-made differential parts and axles, plus more from our trusted suppliers such  as, Eaton, U.S. Gear, Dana/Spicer, Mark Williams, A.A.M. and Auburn Gear.

What IS it that makes

Tom’s Custom Performance Differential Parts & Axles simply the best?


Tom's custom differential parts, K.A. Axles, & many more performance parts and sale items.


If you are a frequent purchaser of Tom's custom parts and qualify as a Jobber or Distributor, sign up for discounted pricing.


Watch our helpful how-to videos for quick tutorials on some of Tom’s custom performance products ...

simply the best custom performance parts

If you're a frequent buyer of tom's custom performance parts and would like to sign up to become a wholesale distributor, take a moment to fill out the form and we'll get you started!