Huge Rear Axle On My TRD Off-Road Trim - 9.5" Upgrade | 4th Gen Tacoma Forum

SXTHElement · 2025-04-15T13:47:16+00:00

We're working on a new intercooler upgrade for the 4th gen Tacoma, and it's shaping up to be a solid improvement over the factory unit. The core features more charge air rows for better thermal efficiency, and we're using cast aluminum end tanks for improved strength and flow characteristics. Lower intake air temperatures during high-stress conditions are the main goal here. As most know, once IATs rise past a certain point, the ECU begins pulling timing and boost to protect the engine, which means power drops off. This setup is designed to delay that threshold and keep performance consistent for longer periods. The prototype is already in development. We're currently testing with 3D printed aluminum-magnesium end tanks to validate fitment and flow. Once we have it on the truck, we'll be posting dyno and temperature data so everyone can see the actual performance difference. If you're pushing your Tacoma hard or live somewhere hot, this will be worth watching.

rustytaco

Administrator

Staff member

Feb 15, 2025

For those wondering, Toyota did give us a lot of what we asked for in this new truck. One crazy important feature, the 9.5" rear axle. This axle is nearly as big as a Dana 60, only .25" smaller. Naturally, they are super strong. You could technically run a 40" tire with relatively little issues. My plan is to run 37s bare minimum in the next few months, and 40s only if I decide to throw it on portals. But I'm beyond stoked on the beefier rear end. Hopefully the front can keep up! The 3rd Gen had a max size of 8.75". While still a good size, these new ones are much better.

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