Jimmy's Custom Speed Shop

08/07/2025

Sunday at midnight (08/10/25) is the final day for shirt & sweat shirt orders. For those who want to pick up orders in person, we'll be at Onaway Speedway

Online ordering for Jimmy's Custom Speed Shop Company Swag 2025 ends on Sun, Aug 10, 2025 (11:59 PM EDT)

07/22/2025

Teamed up with Grand Rapids Graphix. This online store will be open for 2 weeks.

jimmysspeedshop25.itemorder.com

Send a message to learn more

06/26/2025

When race transmission are on the dyno. Gear ratios are checked by comparing digital read out to what was figured on paper.

Thanks to all my friends at Valley Truck Parts Inc.

06/13/2025

Got torque?
I've seen keys break & gears twist. Very rarely do I see this. Look closely at the snap ring, it shows the countershaft is shorter. The 'ol Dodge actually twisted the countershafts.

Them fellas at North American Diesel Parts are making some power!

06/10/2025

Send a message if interested. This is the 1 - 2 sliding clutch. It is meant for racing, not over the road.

05/23/2025

Transmission passed the dyno. Time to get it gift wrapped and shipped.

Thanks to Valley Truck Parts Inc. These guys are great to work with!

05/22/2025

Due to things out of my control, I do not have a spare transmission for Onaway Speedway this time. There's one in the works. Valley Truck Parts Inc. will be on site. Be sure to go see them.

There will be input shafts & 18 Speed billet mainshafts on hand for sale. Also, any questions on transmissions, let me know, be glad to help.
Several input shaft designs:
-Treated stock
- Billet no clutch brake grooves. (Both standard & 1" longer)

04/18/2025

Eaton Fuller stock part # S1659 - cryogenic treated. A customer twisted 300m, in a pinch I had them try one of these to get 'em going again. They're still running. Very durable. Will work great for over the road, and C class trucks. There are a few B class guys that do run these.

$175 + shipping
Message or go to website - click contact box

04/16/2025

Sliding clutches are a hot topic. The one on the left is what I keep seeing. In videos or pictures look for the groove cut in the top of the tooth, thats what gives it away on what's being used. The one on the right is what I use and suggest using.

The left one doesn't fully engage. Add to it guys are raking the teeth.

The right one has more material to work with and will engage further.

04/12/2025

2 units freshened up and ready to go!
Thanks to dyno man Z for his help on both.

Thanks as always to Valley Truck Parts Inc. The entire crew is always fun to go see!

03/28/2025

Getting ready to order a batch of input shafts and mainshafts. Trying to get an idea of who may be interested.

Input shafts are available in standard length or 1" longer. With or without clutch brake groove. These are tried, tested and reliable!

Mainshafts are for Eaton Fuller 18 & 13 Speed designs. See photos for comparison. This is a new design, and is intended for A & B class competition.

If you're interested (message is best way), let me know ASAP. Machine shop is busy. Once order is placed, it'll be another month before next batch can be scheduled.

Looking forward to the 2025 race season 🏁

02/21/2025

Trying out the new billet mainshaft. Very happy with it! More to come on this.

Thanks again to all my friends at