Overview
The Team Associated RC8T4 Diff Ring 40T/Diff Pinion 9T Gears (AS81625) represent a significant upgrade to your RC8T4 or RC8T4e differential system. These matched gear pairs are essential components for any serious RC enthusiast running an Associated 1/10 scale truck, whether you're a weekend basher or a competitive racer pushing your RC car UK setup to the limit. The new 40/9 gear set has been completely redesigned from the ground up, incorporating massive teeth that allow for superior tooth engagement and prevent skipping — a critical advancement that separates these gears from earlier generation alternatives.
If you own an RC8T4, RC8T4e, or even the older RC8T3.2 or RC8T3.2e variants, this gear set is fully compatible across the entire platform. These aren't just replacement parts; they're performance upgrades that have already proven themselves at the highest levels of competitive RC racing. Team Associated driver Spencer Rivkin used this exact 40/9 gear set to win the prestigious 2024 ROAR Electric Truck National Title with his RC8T4e, demonstrating that he could push his truck to maximum performance on track without ever worrying about the durability and reliability of his gearbox. That's the kind of confidence and performance you're getting with this product.
Whether you're servicing worn components, repairing trackside damage, or simply upgrading your RC8T4 for improved reliability and performance, the AS81625 gear pairing provides the matched precision engineering you need for smooth mesh and dependable driveline operation. For any serious RC model shop customer in the UK looking to maintain or enhance their Associated truck, this gear set is an investment in durability and peace of mind.
Key Features
- Redesigned Massive Teeth — The 40T ring gear and 9T pinion gear feature completely redesigned teeth geometry with a much larger profile compared to earlier versions, allowing significantly more tooth engagement during operation and effectively preventing gear skipping during aggressive driving or high-load conditions.
- Premium Gear Pairing — This matched set provides the correct 40-tooth ring gear and 9-tooth input pinion specifically engineered for the RC8T4-series differential, ensuring optimal mesh characteristics and consistent performance whether you're racing or bashing.
- Comprehensive Model Compatibility — Fully compatible with RC8T4, RC8T4e, RC8T3.2, and RC8T3.2e platforms, making this a versatile upgrade or replacement option across multiple generations of Associated trucks.
- Race-Proven Design — These gears are the exact components that contributed to the 2024 ROAR Electric Truck National Title victory, meaning they've been tested and validated at the highest competitive levels where durability and performance are non-negotiable.
- Routine Maintenance Solution — Whether you're replacing wear-and-tear components after extensive use or performing trackside repairs to get back in the race, this gear set restores smooth differential operation quickly and reliably.
- Two-Piece Set Requirement — Each AS81625 package contains one 40T ring gear and one 9T pinion gear; you'll need two complete sets (two pieces of part number 81625) per vehicle for proper front and rear differential installation.
Technical Performance
The RC8T4 40/9 Gear Set represents a significant engineering advancement in differential design for 1/10 scale RC trucks. The newly redesigned tooth profile dramatically increases the surface area of engagement between the ring and pinion gears, which translates directly to improved load distribution and reduced wear during both casual driving and intense competitive racing. The larger teeth prevent the skipping that can occur with older gear designs when torque loads spike, such as during hard acceleration or corner impacts. This enhancement means you can push your RC8T4 or RC8T4e harder without fear of sudden differential failure. The gears are engineered to work as a precisely matched pair — the 40-tooth ring gear and 9-tooth pinion must be installed together to maintain the correct mesh geometry. Installation across both the front and rear differentials ensures balanced driveline performance throughout your truck. The gears restore smooth operation after wear occurs or damage happens, maintaining the precision engineering standards that Associated is recognised for in the RC hobby community. These components have been validated through real-world competitive use, where Spencer Rivkin trusted them completely during his championship run.
What's in the Box
- 1x 40T Diff Ring Gear
- 1x 9T Diff Pinion Gear
What You Need to Complete
- A second AS81625 set (two sets required per vehicle for front and rear differential installation)
- Standard RC model tools for differential service and gear installation
Frequently Asked Questions
- Can I use a single AS81625 set on my RC8T4? — No, you will need two complete AS81625 sets per vehicle, as one set provides gears for either the front or rear differential, but you need matched gears installed in both differentials for proper operation.
- Will this gear set fit my RC8T4e or older RC8T3.2? — Yes, the AS81625 is fully compatible with RC8T4, RC8T4e, RC8T3.2, and RC8T3.2e platforms, making it an excellent upgrade option if you're running any of these Associated truck models.
- What makes these gears better than the original design? — The 40/9 gears feature completely redesigned teeth with a massive profile that provides significantly more tooth engagement and prevents skipping during hard driving, which was validated through Team Associated driver Spencer Rivkin's 2024 ROAR National Title victory.
- Are these gears suitable for competitive racing? — Absolutely; these exact gears were used to win the 2024 ROAR Electric Truck National Title, proving their reliability and performance at the highest competitive levels in RC truck racing in the UK and beyond.
- When should I replace my differential gears? — Differential gears should be replaced if you notice skipping, grinding sounds, inconsistent power delivery, or visible wear or damage to the gear teeth after extensive use or a crash.
Why Buy from RC Model Shop?
RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the TEAM ASSOCIATED RC8T4 DIFF RING 40T/DIFF PINION 9T GEARS AS81625 today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.
- Brand: Team Associated
- Model Number: AS81625
- Product Type: Differential Gear Set
- Gear Configuration: 40T Ring Gear / 9T Pinion Gear
- Ring Gear Teeth: 40T
- Pinion Gear Teeth: 9T
- Compatibility: RC8T4, RC8T4e, RC8T3.2, RC8T3.2e
- Gear Design: Completely redesigned with massive teeth for increased tooth engagement
- Application: Front and rear differential installation
- Sets Required per Vehicle: 2 complete sets (2x AS81625)
- Contents per Package: 1x 40T Diff Ring Gear, 1x 9T Diff Pinion Gear
- Installation Type: Matched pair requiring simultaneous installation
- Performance Feature: Prevents gear skipping with enhanced tooth engagement
- Race Validation: Used to win 2024 ROAR Electric Truck National Title
- Barcode: 784695816251
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