# Manual Gearbox Overhaul in Upland > Manual gearbox overhaul in Upland for noisy, grinding or jumping-out-of-gear transmissions. Teardown findings, photos and a written estimate first. Source: https://route66autorepairshop.com/transmission-services/gearbox-overhaul 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:** An overhaul fits a manual gearbox with **several worn parts**. It is decided after inspection, with **teardown photos** and a written estimate. A gearbox overhaul at Route 66 Auto Repair in Upland is the full answer for a manual transmission with more than one internal problem: noise in several gears, grinding shifts, and a gear that pops out under load. The gearbox is removed, taken apart, cleaned and measured, and worn bearings, synchronizers, seals and damaged gears are replaced. Your written estimate shows every step, and we photograph what we find. ## When does a manual gearbox need an overhaul? One worn part can sometimes be fixed alone. An overhaul makes sense when the symptoms point to more than one: a growl that changes with gear plus grinding into third, or a gear that jumps out while you climb toward the Cajon Pass. Jumping out of gear usually means worn gear teeth, shift fork pads or detents, and it tends to come with bearing wear that lets the shafts move. Before we recommend it, we rule out simple causes. A clutch that does not fully release causes grinding in every gear. Broken engine or transmission mounts let the shifter move and pull a gear out. Low or incorrect gear oil makes shifts notchy and noisy. Our [clutch system inspection](https://route66autorepairshop.com/diagnostics-and-inspections/clutch-system-inspection) checks those first. ## What gets replaced in an overhaul? - Input, output and countershaft bearings - Synchronizer rings and, where worn, sleeves and hubs - Seals and gaskets, including the input and output shaft seals - Shift fork pads and worn detent parts - Gears with chipped or pitted teeth, when found - Gear oil that matches the maker's specification ## Our gearbox overhaul process 1. **Confirm the gearbox is the source:** Road test in each gear, mount check and clutch release test. 2. **Remove and tear down:** The gearbox comes out and is disassembled and cleaned. 3. **Measure and photograph:** Bearings, synchronizers, gears and endplay are checked, and findings are photographed. 4. **Updated estimate:** If teardown finds more than expected, we stop and call you before going further. 5. **Reassemble and verify:** The gearbox is rebuilt to spec, installed, filled and road tested in every gear. ## What's included in a gearbox overhaul - Removal and installation - Teardown, cleaning and measurement - Bearings, synchronizer rings and seals - Correct gear oil - Photos of worn parts - Road test through every gear ## Need-now or need-later? **Need now:** - A gear that jumps out under load - Loud grinding or clunking with metal in the oil **Need later:** - A faint whine in one gear with clean oil - Slight notchiness only when cold ## How pricing and timing work The estimate is built in two parts: removal and teardown, then the parts the inspection proves are needed. Parts availability for your gearbox sets much of the timeline. If the clutch is worn, doing a [clutch repair](https://route66autorepairshop.com/transmission-services/clutch-repair) at the same time saves repeat labor, and we list it as a separate line so you can choose. ## Aftercare Shift smoothly and avoid hard launches for the first few hundred miles while new parts settle. We recheck the oil level and look for leaks at a follow-up visit. Warranty coverage is written on your invoice. If a single noise returns later, our [gearbox bearing replacement](https://route66autorepairshop.com/transmission-services/gearbox-bearing-replacement) page explains how we isolate it. ## Frequently asked questions ### Is an overhaul better than a replacement gearbox? It depends on parts availability, the condition of the case and gears, and timing. We explain both options once we know what is worn, and the choice is yours. ### Why did my gearbox start jumping out of gear? Worn gear teeth, shift fork pads or detents are common causes, and broken mounts can make it worse. We check the mounts first, since that repair is simpler. ### Should I replace the clutch at the same time? If the clutch has meaningful wear, yes, because the gearbox is already out. If it is in good shape, we will say so and you can skip it. --- Call (909) 608-7699 or visit https://route66autorepairshop.com/contact for a written estimate.