LS Swap Your Classic Truck: The Honest Cost Breakdown

vintagerustapparel
Apr 1
2 min read

Updated: 3 days ago

Everyone talks about the LS swap like it is a weekend project. Pull the old motor, drop in an LS, done. In reality, it is one of the best upgrades you can make to a classic truck, but the cost can surprise you if you are not prepared. Here is what it actually costs.

The Engine: $1,500 to $8,000

A junkyard 5.3L from a 2007 Silverado runs $500 to $1,500 depending on mileage and your negotiating skills. That is the budget route and it works great. A crate LS3 from Chevrolet Performance starts around $7,500. Most guys land somewhere in the middle with a rebuilt 5.3 or 6.0 for $2,000 to $4,000.

The Swap Kit: $500 to $2,000

Motor mounts, oil pan (the truck pan clears the crossmember, the car pan does not), headers, and a wiring harness. Companies like Holley, Hooker, and Dirty Dingo make swap kits that bolt right in. Budget $1,200 to $2,000 for a quality kit. The cheap eBay headers will crack. Ask anyone who has tried them.

Transmission: $0 to $3,500

If you already have a TH350 or TH400, a simple adapter plate lets you bolt the LS right to it. Cost: under $200. Want overdrive? A 4L60E or 4L80E from the same junkyard truck runs $300 to $800, but now you need a transmission controller ($200 to $800). Going full modern with a Tremec T56 manual? That is $2,500 to $3,500.

The Hidden Costs

Fuel system upgrade (return-style fuel line plus an electric pump): $300 to $600. Cooling system (aluminum radiator, electric fans, new hoses): $400 to $800. ECU tuning: $200 to $500. Exhaust from headers back: $400 to $1,200. Driveshaft shortened: $150 to $300. These add up fast.

Total Realistic Budget

Budget route (junkyard 5.3, keep your TH350, do the work yourself): $3,000 to $5,000. Mid-level (rebuilt 6.0, 4L60E, quality swap kit): $6,000 to $10,000. Full send (crate LS3, Tremec 6-speed, everything new): $15,000 to $20,000. The LS swap is the best power-per-dollar upgrade in the classic truck world. Just go in with your eyes open on the real cost.

Gear Up

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