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Find RockAuto warehouse-split shipping and the swap that ships your order together. Unofficial, not affiliated with RockAuto. Stop Paying More Because RockAuto Ships From Multiple Warehouses See exactly when your RockAuto order is split across warehouses, find the part causing the split, and get a one-click fix that can consolidate your order. If RockAuto says your cart “ships from 3 warehouses,” you may be paying a separate shipping charge for each warehouse. RockAuto Cart Optimizer finds those splits directly on your cart page. It shows you what is happening, what can be changed, and how much the change is estimated to save. No guessing. No manual part hunting. No subscription. FREE: See Exactly Why Your Order Is Split Install the extension and it analyzes your RockAuto cart automatically. You’ll see: How many warehouses your order is shipping from Whether your order can be consolidated into fewer warehouses The estimated shipping savings from consolidating your order For example: Ships from 3 warehouses These items could ship from 2 warehouses instead Estimated savings: ~$18 The warehouse reduction is based on the actual candidate warehouses for the parts in your cart. Shipping-dollar amounts are always labeled as estimates. RockAuto determines the actual shipping cost when you calculate shipping. PRO: Fix the Split With One Click: $10 One-Time, No subscriptions Found a split? Pro shows you the exact brand swap that can consolidate your order. For example: Swap MOTORAD T151 → DORMAN 82599 Part cost: +$0.80 Shipping: $27 → $18 Estimated net savings: ~$13 Then click Apply Swaps. The extension applies the change, re-checks your actual RockAuto cart, and shows you what happened. Every suggested swap is fitment-aware It doesn't simply find a cheaper or different brand. It checks the fitment information RockAuto provides, including attributes such as: Left / right Front / rear ABS Drive type Engine Other applicable fitment attributes So the goal is not just “find another part.” It's “find a part that fits your vehicle and lets the order ship together.” You control the swap rules Choose the rules that matter to you, including: Minimum acceptable quality tier Match material / grade Maximum price increase per part Prioritize shipping savings vs. lowest overall part cost Apply It. Verify It. Undo It. After applying a swap, the extension re-checks the real cart. You'll see: Predicted: 2 warehouses Actual: 2 warehouses Predicted parts total: $129.14 Actual parts total: $129.14 If RockAuto groups the order differently than expected, you can revert the swaps with one click. The extension doesn't pretend an estimate is a guarantee. It verifies the result against the actual cart. No monthly fee No recurring subscription No hidden membership Full refund if it doesn't save you money — just ask Payment is securely handled by ExtensionPay using Stripe. The extension never sees your card information. Private by Design Your cart data doesn't need to leave your browser. 100% client-side No servers of our own No account required No analytics No data collection No ad tracking Runs only on rockauto.com Only reads the RockAuto cart and catalog pages you actually visit Learned data stays in your browser and expires after 14 days See the Split. Find the Cause. Fix It. RockAuto's warehouse splitting can turn one order into multiple shipping charges. RockAuto Cart Optimizer shows you exactly when that's happening—and gives you a practical way to fix it. Install it free. Analyze your cart. Upgrade only if you want the one-click fix. Unofficial tool. Not affiliated with, endorsed by, or connected to RockAuto, LLC. “RockAuto” is a trademark of its respective owner and is used only to describe compatibility.