Used 6.6L Duramax LB7/LLY for Sale — VIN-Verified.
Powerstroke, Duramax & Cummins — VIN-verified, tested diesels for Houston trucks, shipped right the first time. 0% restocking, ever.
Used & remanufactured 6.6L Duramax LB7/LLY — VIN-verified, tested, and shipped nationwide from our Pasadena, TX facility. Fits Silverado/Sierra 2500HD/3500HD (2001-2007).
The early 6.6L Duramax (LB7, LLY) is a top diesel search. We inspect for the known LB7 injector and LLY overheating issues and VIN-match the exact RPO code. Ultra Auto Parts TX is Houston's drivetrain specialist for used and remanufactured diesel engines, serving Pasadena, Deer Park, Baytown, La Porte, Channelview and the wider Gulf Coast truck market from our shop at 5041 Spencer Hwy, Ste 101, Pasadena, TX 77505. In a region built on work trucks, fleets and towing, we focus on the three diesel platforms Texans actually run — Ford Power Stroke, GM Duramax and Dodge/Ram Cummins — and match every long block or complete engine to your exact VIN before it ships. Unlike a general salvage yard, we treat diesels as core drivetrain, not random inventory. Every used diesel engine is VIN-verified against your truck's year, cab and emissions configuration, then inspected and tested before we quote a firm price. We speak English and Spanish, respond within 10 minutes during business hours, and back every diesel with a real warranty — so Houston owner-operators and shops buy with confidence.
Known issues we check on the LB7 & LLY Duramax
The early Duramax splits into two: the LB7 (2001–2004) is famous for injector failure — and they sit under the valve covers, so we check injector health closely — while the LLY (2004.5–2005) is prone to overheating from restrictive airflow. We VIN-verify the exact RPO code (you don't want an LLY sold as an LB7) and compression-test before quoting.
Used vs. remanufactured LB7/LLY Duramax — which to buy
On an LB7, factor injectors into the decision — a reman long block or a used engine with fresh, known-good injectors saves a second job. On an LLY, cooling upgrades matter as much as the block. A tested used engine is a strong value on a documented donor; reman makes sense for high-mileage tow rigs. Send your VIN for used-vs-reman pricing.
Why buy a quality used diesel engines?
A diesel is the most expensive component in the truck, and a proper machine-shop overhaul often runs $8,000–$15,000+ once you add gaskets, injectors, machine work and labor. A quality tested used engine or a reman built to OEM spec gets you back on the road faster, at a fraction of that cost, with a warranty covering the assembly — not a shop's one-off labor guarantee. For a work truck losing money every day it's down, verified used or reman is usually the smarter math.
Common signs you need a replacement
We know these platforms cold: 6.0L Power Stroke head-gasket and stretched-head-bolt failures, EGR and oil-cooler issues; 6.4L Power Stroke cracked pistons; LB7 Duramax injector failures and later LLY overheating; Cummins 5.9L (12v/24v) VP44 and lift-pump issues, 6.7L DPF/EGR and injector wear; and high-mileage blowby on all three. We inspect for exactly these before quoting.
| Feature | Ultra Auto Parts TX | Typical salvage yard |
|---|---|---|
| Restocking fee | 0% — ever | ~20% |
| Warranty | 6 mo – 3 yr | 6 mo flat |
| Fitment | VIN-verified to your vehicle | Not verified |
| Drivetrain testing | Specialized per component | General salvage |
| Service | Bilingual · 10-min response | Varies |
Quick Quote Fastest lead
Send Name + Phone + Part + ZIP. VIN recommended for exact fitment.
Fitment Flags We Check
- Year-specific emissions hardware (EGR/DPF/SCR) must match your truck
- Long block vs complete drop-in engine — confirm what's included
- VIN 8th-digit engine code identifies the exact diesel variant
- Cab & chassis vs pickup accessories and oil-pan/turbo differences
- Automatic vs manual transmission flexplate/flywheel and sensors
- California vs federal (49-state) emissions calibration
Diesel drivetrain is our specialty — alongside engines we also supply matched heavy-duty transmissions (Allison, TorqShift, 68RFE, ZF), transfer cases and Dana/AAM axles for the same trucks.
What to send for an exact quote
- VIN (best — locks exact fitment)
- Year/make/model (F-250/2500/3500, Silverado/Sierra HD, Ram HD)
- Engine (Power Stroke/Duramax/Cummins + displacement)
- Cab type (regular/extended/crew, pickup or cab-&-chassis)
- Mileage expectation and used vs. reman preference
Every used diesel engine carries a standard 6-month warranty, extendable up to 3 years on tiered/reman options. And we charge a 0% restocking fee on all returns — no penalty for making it right.
Diesel engines are heavy freight — local Houston-area delivery is free with our own drivers, while regional and out-of-state moves ship by freight at exact or quoted cost; we confirm the timing before we promise it.
How It Works
FAQ — Used Diesel Engines in Houston, TX
Where can I buy a used 6.6 Duramax LB7 or LLY near me in Houston?
Ultra Auto Parts TX in Pasadena (Houston area) stocks VIN-verified used and remanufactured 6.6L Duramax LB7 and LLY engines for 2001–2007 Silverado/Sierra HD, tested and RPO-matched, with a 6-month to 3-year warranty and 0% restocking. Call (281) 436-9991 or text 281-436-9991.
Do you check the injectors on a used LB7 Duramax?
Yes — LB7 injectors are the known weak point and they sit under the valve covers, so we inspect injector condition on every LB7 and tell you what you're getting. If you'd rather not gamble, we'll quote a reman long block or a used engine with known-good injectors. Send your VIN.
How much does a used 6.6 Duramax engine cost?
It depends on the RPO variant (LB7 vs LLY), mileage, injectors, and used vs reman. We never quote without your VIN — send it to 281-436-9991 and we'll give you an honest range the same day, backed by warranty and 0% restocking.
Ultra Auto Parts TX is a used and remanufactured drivetrain-parts dealer in Pasadena, TX (Houston metro). 5041 Spencer Hwy Ste 101, Pasadena TX 77505 · (281) 436-9991 · Mon–Fri 8am–5pm CT · Bilingual · 0% restocking · 6mo–3yr warranty.
Looking for a used diesel engine in Houston, TX? Ultra Auto Parts TX in Pasadena supplies VIN-verified, tested used and remanufactured Ford Power Stroke (7.3L, 6.0L, 6.4L, 6.7L), GM 6.6L Duramax and Dodge/Ram Cummins (5.9L, 6.7L) diesel engines for F-250/F-350, Silverado/Sierra 2500HD/3500HD and Ram HD trucks. As Houston's drivetrain specialist we match by VIN and emissions year, back every diesel with a 6-month to 3-year warranty and 0% restocking, and serve the whole Gulf Coast in English and Spanish.