# Transmission Output Shaft Repair in Upland > Clunk or vibration at the rear of the transmission? Route 66 Auto Repair in Upland checks output shaft play, splines and bushings and quotes the repair. Source: https://route66autorepairshop.com/transmission-services/transmission-output-shaft-repair Updated: 2026-09-17 Business: Route 66 Auto Repair, 1775 W Foothill Blvd, Upland, CA 91786, (909) 608-7699 Hours: Monday to Friday 8 AM–5 PM, Saturday 8 AM–2 PM, Sunday closed **TLDR:** Output shaft wear shows as **clunks, vibration** and repeat seal leaks. We measure **shaft play** before any internal repair. The output shaft sends power from the transmission to the driveshaft or axles, and Route 66 Auto Repair in Upland repairs output shafts, their splines and their support bushings or bearings. Wear here shows up as a clunk when you take off, vibration at speed, or a rear seal that keeps leaking. Our ASE-certified technicians measure shaft play and check the driveshaft yoke before deciding on internal work. ## What are signs of a worn output shaft? - A clunk when you accelerate from a stop or shift into gear - Vibration that increases with road speed - A rear seal that leaks again soon after replacement - Visible up-and-down play at the driveshaft yoke - Worn or rusty splines on the yoke - A speed sensor reading that drops in and out ## What causes output shaft wear? Most rear-drive transmissions support the output shaft with a bushing or bearing in the tail housing. When it wears, the driveshaft yoke moves up and down, which makes vibration and tears the seal. Towing and heavy loads speed this up, as do driveline angles changed by lift kits or worn mounts. Before opening the transmission, we check the [driveshaft](https://route66autorepairshop.com/drivetrain-and-additional-mechanical-services/driveshaft-repair) and U-joints, because they can cause the same clunk. If only the bushing is worn, some designs allow a tail-housing repair. Worn shaft splines or internal support usually mean deeper work, and your written estimate shows every step. The seal itself is covered on [output shaft seal replacement](https://route66autorepairshop.com/transmission-services/output-shaft-seal-replacement). A reading problem may be a [speed sensor](https://route66autorepairshop.com/transmission-services/transmission-speed-sensor-repair) issue instead. ## Our output shaft repair process 1. **Check the driveline:** Driveshaft, U-joints and yoke splines are checked for wear first. 2. **Measure shaft play:** Up-and-down movement at the yoke is measured against spec. 3. **Repair the worn part:** The bushing, bearing or shaft is replaced with the access your design needs. 4. **Seal, fill and test:** A new seal is installed, fluid is set, and we road-test for clunk and vibration. ## What's included in output shaft repair - Driveline and U-joint check - Output shaft play measurement - Yoke spline inspection - Bushing, bearing or shaft replacement as quoted - New output seal - Fluid top-off and road test ## Is output shaft wear a need-now repair? **Need now:** - Heavy play that is tearing the seal - Clunk with vibration at freeway speed - Low fluid from a leaking tail seal **Need later:** - Slight play within spec, rechecked at service - Minor spline wear on the yoke ## How we price output shaft repair Tail-housing bushing jobs can often be done in the vehicle. Shaft or internal bearing work usually means removal. We quote the path your design needs and explain why. The diagnostic fee is stated at the counter and applies to approved related repair. AAA members save 10% on parts and labor, up to $75. ## After the repair The clunk and vibration should be gone. If you tow, check for rear drips after your first trailer trip. Keep driveline angles in mind if you lift the truck later. ## Frequently asked questions ### Why does my rear transmission seal keep leaking? A worn output bushing or bearing lets the yoke wobble, which wears the new seal quickly. Replacing the support fixes the cause. ### Can a worn output shaft affect the speedometer? Yes. Many speed sensors read the output shaft, so excess play can cause erratic readings. ### Is this job the same on front-wheel-drive cars? Front-drive cars have output gears and axle seals instead of one rear shaft. We explain what applies to your vehicle. --- Call (909) 608-7699 or visit https://route66autorepairshop.com/contact for a written estimate.