The best RC crawler transfer case depends on whether you want a fixed 1:1 ratio, overdrive, selectable speeds, or multiple output-shaft options. The Pothyes LCG gearbox is best for a front-motor build seeking 30% overdrive; the G.T.R RC unit suits DIY setups that need three shaft choices; and the Pothyes 1:1 case is a straightforward option for compatible SCX10 or D90 builds. Compare mounting dimensions and drivetrain compatibility before ordering.
| Product | Best suited for | Key feature |
|---|---|---|
| Pothyes LCG Gearbox | Overdrive-focused builds | 30% overdrive |
| G.T.R RC Transfer Case | Custom gear-ratio choices | Three shaft options |
| Pothyes 1:1 Transfer Case | Fixed-ratio setups | 1:1 ratio and mount plate |
| VGEBY Two-Speed Case | Two-speed builds | CNC-machined aluminum |
| ZELIYOON Two-Speed Case | Selectable trail and crawl speeds | Two gear ratios |
Pothyes LCG 30% Overdrive Gearbox
This front-motor LCG gearbox is designed for 1/10 crawlers and uses multiple gear sets to produce a listed 30% overdrive effect. Its CNC-machined aluminum alloy construction is paired with a large POM gear, which the product description identifies as a quieter-running component.
Best for: Builders seeking overdrive in a compatible LCG or front-motor setup. Choose this if its listed fitment matches your chassis and you want a specific overdrive ratio rather than a selectable-speed case.
Limitation: The 30% overdrive is a fixed design feature, not a selectable setting. Verify the chassis and transmission fit before purchase.
G.T.R RC Transfer Case With Three Shaft Options
This 70mm-wide transfer case has a CNC aluminum housing, a 5mm stainless steel shaft, and full ball bearings. It includes three connecting-shaft options: 30% underdrive, reverse, and normal. Those options make it useful for builders who want to configure the drivetrain around a particular project or driving preference.
Best for: DIY builders who value multiple shaft configurations in one package. It is a more flexible choice than a fixed-ratio case when the included options suit the build.
Limitation: The listed width is 70mm, so measure available chassis space and check shaft connections before choosing it.
Pothyes 1:1 Transfer Case With Mount Plate
This aluminum gearbox provides a 1:1 ratio and includes a mount plate. The listing identifies it for 1/10 SCX10 and D90 crawlers, as well as 1/14 Tamiya tractor trucks. Its listed weight is 67.7 grams, which may help builders account for component weight when planning a custom installation.
Best for: Drivers who want a simple, fixed 1:1 transfer case and have a listed compatible platform. It avoids adding selectable ratios when a standard ratio meets the build’s needs.
Limitation: The listed ratio is 1:1; it does not offer the overdrive or two-speed functions found in other options here. Confirm mounting dimensions for your exact chassis.
VGEBY CNC Two-Speed Transfer Case
The VGEBY transfer case is a two-speed unit with a CNC-machined aluminum alloy construction. Its listing specifies use for 1/10 crawlers with a 313mm wheelbase and a metal frame. Two speeds can provide a different setup from a fixed-ratio transfer case, but the product details do not specify the actual gear ratios.
Best for: Builders whose crawler matches the stated wheelbase and who are looking for a two-speed case. Its stated application makes wheelbase and frame checks especially important.
Limitation: The available product details do not name the speed ratios or explain shifting requirements. Check those points and confirm fitment before buying.
ZELIYOON 48P Selectable Two-Speed Case
This two-speed transfer case lists a 1.8:1 ratio for high-torque crawling and a 0.7:1 ratio for higher-speed driving. It has a CNC-machined aluminum housing and 48-pitch steel gears. The stated ratios make it easier to compare its intended speed range with a fixed 1:1 or overdrive case.
Best for: Drivers who want selectable ratios for different terrain and whose build can accommodate the unit. Choose it if the listed gear ratios match your intended crawl and trail use.
Limitation: The product details do not specify vehicle-specific fitment or shifting hardware. Confirm installation and control requirements for your setup.
Buying Guide: How To Choose An RC Crawler Transfer Case
Do you need a fixed ratio, overdrive, or two speeds?
A 1:1 case maintains equal input and output speed according to its listed ratio. An overdrive or underdrive option changes the relative output speed, while a two-speed unit provides selectable ratios. Compare the stated ratios and intended use rather than assuming every two-speed case behaves the same way.
Will it fit your chassis and drivetrain?
Check scale, chassis layout, mounting points, shaft connections, and available space. A product may mention a model family or wheelbase, but that does not guarantee fit with every modified version. For a 70mm-wide case, confirm that the chassis has room for the housing and connecting shafts.
What construction details matter?
Aluminum alloy housings and CNC machining are listed on several options above. Some products also specify stainless steel shafts, ball bearings, or steel gears. Compare the actual included components and materials; do not assume features from one model apply to another.
Should you prioritize flexibility or simplicity?
A fixed-ratio case can be appropriate when its ratio suits the build. Multiple shaft choices or selectable speeds offer more configuration options, but require checking the included parts and installation needs. Confirm what comes in the package before planning a conversion.
Frequently Asked Questions
What does a transfer case do in an RC crawler?
A transfer case routes drivetrain power to the crawler’s output shafts. Its ratio and configuration affect how power is delivered through the drivetrain.
Is a 1:1 transfer case the same as a two-speed case?
No. A 1:1 case lists one fixed ratio, while a two-speed case offers two selectable ratios. Check the product specifications for the actual ratios.
What does 30% overdrive mean on an RC crawler gearbox?
It describes a faster output relationship for the designated drivetrain section compared with its reference ratio. The exact effect depends on the gearbox design and installation.
How can I check whether a transfer case will fit?
Compare the product’s stated chassis or model compatibility with your vehicle. Also measure mounting space, case width, and shaft connections before ordering.
Do all two-speed transfer cases include shifting hardware?
Not necessarily. Product details vary. Confirm whether the listing specifies a shifter, servo, linkage, or other components needed to select gears.