FEATURES: - CNC machined aluminum differential case- Hardened steel main differential gear- Sealed differentials allows you to tune to current track conditions by changing the weight of the diff. oil- Four O-Rings help seal against fluid leakage which results in a very smooth differential that improves the performance of your vehicle YOU WILL RECEIVE: - One (1) aluminum differential case (2 halves)- One (1) steel main gear- One (1) o-ring and hardware pack REQUIREMENTS: - Filling differential fluid and assembling the diff case with stock TRA differential gears- Recommended to use a removable-type locking adhesive on screws threading into metal SPECIFICATIONS: - Outdrive o-rings: 8x5x1.5mm- Case seal o-rings: 29x27x1mm- 61t, 32p COMMENTS: - Replacement o-rings are Hot Racing RTE38CH- Is NOT compatible with Hot Racing TE125 Differential Locker Spool