What Is Redcat Part 505111ST Used For? Fitment FAQ
By Redcat Racing | Published: 2026-11-04
Category: Reseñas de productos
Redcat 505111ST is a two-piece steel front and rear differential outdrive for the TR-MT8E-V2. Here is what it does, where it fits, and when to replace it.
Quick answer
Redcat 505111ST is a steel front and rear differential outdrive sold as a two-piece set. It is listed as a hop-up and spare part for the TR-MT8E-V2, so it is the part to check when you are replacing worn outdrives at either differential.
Where the outdrive sits in the drivetrain
An outdrive is the output stub that carries power from the differential out to the rest of the driveline. Because 505111ST covers both front and rear positions, one listing can serve either end of the vehicle rather than forcing you to buy two different part numbers.
The catalog describes this as a hop-up and spare part. That means it can serve as a direct replacement for a damaged original or as an upgrade path when you are already rebuilding a differential.
Why the TR-MT8E-V2 fitment note matters
The listed compatibility is specific to the TR-MT8E-V2. Redcat has produced many platforms over the years, and outdrive dimensions are not universal across them. Treat the catalog fitment note as the starting point, then confirm the part number on your own exploded view or manual before ordering.
If your vehicle is not a TR-MT8E-V2, do not assume this part will drop in. The listing does not supply dimensions or spline counts, so there is no reliable way to cross-fit it to another chassis from the catalog data alone.
Clearance stock and what it means for your build
This listing is marked as a clearance item. Clearance usually means limited remaining stock rather than a change in the part itself, but it does mean you should not count on a second order arriving later. If you run two vehicles or expect to service both differentials again, plan accordingly.
The catalog price is shown as USD 4.74 against a comparison price of USD 7.77. That is a pricing detail, not a performance claim; judge the part on fit and condition, not on the discount.
Redcat 505111ST fitment FAQ
- What is Redcat 505111ST used for?
- It is the differential outdrive for the front and rear differentials, supplied as a two-piece set. Use it when replacing a worn or damaged outdrive or when rebuilding a differential on a compatible vehicle.
- Will 505111ST fit my Redcat?
- The catalog lists compatibility with the TR-MT8E-V2 only. Check your manual or exploded view for the 505111ST part number before ordering; if your chassis is different, this is not a confirmed fit. Confirm the part number against your own vehicle documentation, not just the model name.
- How many outdrives come in the set?
- The listing is a two-piece set, so you receive two outdrives. That matches one front and one rear position on a single vehicle.
- Is this a hop-up or a spare part?
- The catalog classifies it under both hop-ups and spare parts. It can replace a failed original outdrive or be fitted during a planned differential rebuild.
- What should I check before installing?
- Inspect the differential bearings and the mating drive cups for wear while the outdrives are out. A new outdrive running against a worn cup will not fix a driveline noise on its own. Replace worn mating parts at the same time to avoid a repeat teardown.
- Why is stock limited?
- The listing is marked as a clearance item. Availability can end without a restock, so order the quantity you need for your current and near-term rebuilds in one go.
Product facts
- 505111ST: Steel front and rear differential outdrive, quantity 2, part number 505111ST. One set covers both differential positions, so a single order can address front and rear wear at the same time.
505111ST
