Pro-Line HD Performance Transmission

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This is the Pro-Line HD Performance Transmission. The HD Performance Transmission has been specifically designed to bring your rig up to its full bashing potential. Every feature you would expect to find in a high-end race transmission has been included, such as steel internal planetary gears. The HD Performance Transmission is the stock replacement for the Pro-Line PRO-MT, but is also a great upgrade for Electric Slash 2WD and Electric Rustler trucks, as well as the Bandit (w/18T pinion), and it is a direct fit upgrade for the stock Transmission included with the Pro-Line PRO-2 SC truck and PRO-2 Buggy!

Pre-Assembled – Install and Go
Transmissions are complicated and have a lot of moving parts. Pro-Line has done the work for you and pre-assembled the transmission to get you bashing fast! Simply install and go! The Sealed, Oil-filled Differential has been pre-filled with 5,000 wt. diff oil and the slipper system has been pre-set for proper performance.

Sealed, Oil-Filled Gear Differential
The single biggest feature and upgrade is Pro-Line’s Performance Differential. The design is based off of 1/8 Buggy style sealed differentials and is completely tunable to your current track conditions by changing the weight of the diff oil. The Differential features super smooth Steel Internal Diff Gears for the ultimate in durability, with four O-Rings and a Diff Gasket that seals against fluid leakage. You will be amazed at how smooth the Differential is and how much it improves the performance of your vehicle.

Race Inspired Slipper System with Vented Discs
The Performance Transmission uses a proven, race style Slipper Pad and plate system that is more consistent, lighter and runs truer than the stock slipper design. The Plates are Hard Anodized Aluminum with Vent Holes, which reduces heat and improves slipper consistency. Pro-Line’s 86T Spur Gear is extra wide for durability and is not offset like the stock spur gear. No more wobbly spur gears! The Clear hard plastic Gear Cover has a removable rubber cap for easy access to adjust the tension on the slipper system. Adjustments can be made with the same 7mm tool that you use to remove wheel nuts.

Heavy Duty Steel Gears
Pro-Line’s HD Performance Transmission has been built to take some serious power with all steel internal gears. This allows for bigger motors, more powerful batteries and loads of wheelie popping fun. The Top Gear, Idler Gear, Bottom Gear and all of the internal Differential Gears are all made from strong Steel.

3mm Thick Aluminum Motor Plate, Full Ball Bearings, & More
The motor mounts to 3mm thick Aluminum Motor Plate with cooling fins and a machined P-L logo, all of which act as a huge heat sink to keep your motor running cool. High quality Ball Bearings are used throughout the Transmission and the Differential spins on huge 10mm x 16mm x 5mm Ball Bearings for incredible load capability. The Toe Block is molded separate from the Transmission Case allowing for quicker and easier access to the Transmission when tuning the Differential Oil. The separate Toe Block also opens up the possibility for different tuning blocks (Toe Angle and Anti-Squat) to be used at some point in the future. The Hardened Steel Outdrive Shafts will accept the stock axles, as well as any aftermarket CVD’s or drive shafts that you might have for your vehicle.


  • Pre-Built - Ready to Install and Go!
  • Transforms your Vehicle into a High-End Bashing Machine
  • All Steel Internal Gears
  • Fully Tunable Oil Filled Super Smooth Gear Differential
  • Racing Style Slipper System with Vented Discs
  • 3mm thick Aluminum Motor Mount
  • Ball Bearings Used Throughout
  • Separate Toe Block for Easy Transmission Removal
  • Stock Replacement Part for the Pro-Line PRO-MT truck kit
  • Replacement Part Packs Available Separately


  • Pre-Built Performance Transmission
  • Extra Bottle of 5,000 wt. Diff Fluid
  • Hardware Bag: Motor Screws & Washers, Bumper/Wheelie Bar Mounting Screws, Outdrive Shims

This product was added to our catalog on December 11, 2014.

Michael Chapman
Verified Owner
Monday, Aug 24 2015 (about a year ago)
Pro-Line HD Performance Transmission
This was my first experience with a pro-line product, and I am not impressed. Opened the packaging and the fluid had leaked everywhere. I was unsure if I should just return it at that stage or clean it up and attempt to install it. I chose to install it, or I would have if it was possible. The four large screws that are meant to secure this to the chassis do not fit the pre drilled holes, by maybe a millimeter. That would be fine if it was the only problem because I could just drill the holes larger, but the two halves of the transmission do not fit together perfectly, causing the oil leak. I have no doubt that this was probably just one that slipped through quality control though, because of pro-line's great reputation. I have contacted them about a replacement and will update my review if they replace it. Update 30/8/15: apparently proline and amain dont respond to emails... But i did get a hold of amain through live chat and i am now getting a refund. I wont bother replacing it as i cant take the risk of having to ship it back again at my own cost. And incase anyone was wondering its $30 to return a tiny transmission from Australia to California. 8/10 for amains customer service, having to pay for return shipping isnt cool but i guess it is understandable. 0/10 for prolines hard parts and customer service. Update 2 11/9/15: thanks to A-main for refunding me, glad this is over. Proline still havent responded to the original email, I find it worrying that a company of their scale would just ignore a customer who had issues that they dont know have been resolved.
Gabe Estrada
Sunday, Dec 6 2015 (10 months ago)
Pro-Line HD Performance Transmission
This transmission is junk. I have broken it 4 times. 2 output shafts, one idler gear, and now the gearbox cracked in half. It has nice features but the engineering and materials are the worst I've seen. The stock slash parts don't perform as well but are way more durable and I regret buying this. Parts like this is what makes people lose interest in this hobby.
Chris McDonald
Tuesday, Sep 20 2016 (4 weeks ago)
Pro-Line HD Performance Transmission
I have had zero issues with this transmission in my slash, it has drastically improved performance and sound (a lot quieter)I would and have recommended this product to friends. My truck is a basher so I believe it is up to the task.