# Transfer Case Fluid Change in Upland > Route 66 Auto Repair in Upland drains and refills transfer case fluid with the type your 4WD specifies, checks the magnet for metal and sets the level right. Source: https://route66autorepairshop.com/transmission-services/transfer-case-fluid-change 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:** A drain and refill replaces worn lubricant with the **exact fluid type** your transfer case needs. The drain plug magnet also gives an **early warning** of wear. A transfer case fluid change is a drain and refill of the lubricant inside your 4WD or AWD transfer case, and Route 66 Auto Repair in Upland does it as routine maintenance. It is one of the most skipped services on trucks and SUVs. Our ASE-certified technicians use the exact fluid your owner's manual names, because transfer cases vary widely: some take gear oil, some take automatic transmission fluid, some take a special blend. ## When is a transfer case fluid change due? - Your owner's manual interval has passed, or you do not know when it was last done - You tow, go off-road or drive through water - You just bought a used 4WD with no records - The shift into 4WD feels stiffer than it used to - A mild whine has started in the middle of the truck ## What happens during a drain and fill? We remove the fill plug first. That order matters: if the fill plug is seized, we find out before the case is empty. Then the drain plug comes out and the old fluid drains while we look at it. The magnet on the drain plug collects fine metal. A light gray paste is normal wear. Chips or slivers are not, and we photograph them for you, then check the [chain](https://route66autorepairshop.com/transmission-services/transfer-case-chain-replacement) and bearings. The case is refilled with the specified fluid until it reaches the correct level at the fill hole. Using the wrong fluid can cause chatter or poor shifting. If the old fluid shows water or heavy debris, a [transfer case fluid flush](https://route66autorepairshop.com/transmission-services/transfer-case-fluid-flush) may be the better next step. Many owners pair this with a [differential fluid inspection](https://route66autorepairshop.com/diagnostics-and-inspections/differential-fluid-inspection). ## Our fluid change process 1. **Confirm the fluid:** We look up the exact fluid type and capacity for your transfer case. 2. **Crack the fill plug first:** The fill plug is loosened before draining so the case can be refilled. 3. **Drain and inspect:** Old fluid and the drain magnet are checked for water, burning and metal. 4. **Refill and seal:** New fluid goes in to the fill-hole level and both plugs are torqued to spec. ## What's included in a transfer case fluid change - Fluid type lookup for your transfer case - Fill plug loosened before drain - Drain magnet inspection with photos if metal is found - New fluid to the specified type and level - Plug washers or sealant as specified - Leak check and short engagement test ## Is a transfer case fluid change urgent? **Need now:** - Fluid is low or leaking - Metal chips on the magnet - Water in the fluid after deep water crossing **Need later:** - Mileage-based change on a quiet, dry unit - Changing fluid on a truck that rarely uses 4WD ## Pricing and time for a fluid change Price depends on the fluid type and capacity, plus access to the plugs; skid plates add time on some trucks. The written estimate lists both. This is usually a short visit, and it often fits the same day when the board allows. AAA members save 10% on parts and labor, up to $75. ## After the fluid change Nothing special is needed. Check for drips where you park over the next few days. Your invoice records the fluid type and mileage so you know when the next change is due. ## Frequently asked questions ### How often should transfer case fluid be changed? Follow your owner's manual. Many list a longer interval for normal use and a shorter one for towing or off-road driving. Most Upland trucks that tow fall under the severe schedule. ### Can I use regular gear oil in my transfer case? Only if your owner's manual calls for it. Many transfer cases take automatic transmission fluid or a special fluid. The wrong one can cause noise and poor engagement. ### What does metal on the drain plug mean? Fine gray paste is normal. Chips, slivers or chunks point to chain, bearing or gear wear. We photograph what we find and explain the options. --- Call (909) 608-7699 or visit https://route66autorepairshop.com/contact for a written estimate.