SportMonster Chevy 4L65E Transmission and Torque Converter 4WD

In-stock transmissions usually ship the next business day.

Custom builds or out-of-stock units typically ship within 4–6 weeks.

Need it sooner? Call us — we can often make special arrangements.

We offer the most comprehensive coverage in the industry:

• RoadReady: up to 6 Years (3 Year Manufacture, optional 2 or 3 Years from Extend)
• StockMonster: up to 4 Years (1 Year Manufacture, optional 2 or 3 Years from Extend)
• StreetMonster: up to 5 Years (2 Year Manufacture, optional 2 or 3 Years from Extend)
• SportMonster: 6 Years (3 Year Manufacture, 3 Years from Extend included)
• TrackMonster: 1 Year (1 Year Manufacture, Extend not available)

Extend warranties are included on all Transmission Purchases read more HERE.

No — we offer a $364 Flat-Rate One-Way Shipping to any Address.

If you find a better rate, you're welcome to arrange your own shipping.

The easiest way to tell the difference is by checking your vehicle’s year and engine type:

• In 1998, GM introduced the LS1 engine and began using the 4L65.
• By 1999, trucks with 4.8L, 5.3L, or 6.0L LS engines came factory-equipped with the 4L65.
• If your vehicle is 1998 or older and does not have an LS engine, it likely has a 4L60.

Tip: If your vehicle is from 1999+ and has an LS engine, use our 4L65 transmission for proper fitment.

Yes! Our upgraded 4L65 builds are ideal for cammed and even boosted LS-powered vehicles.

• For moderate cams and street use, choose our StreetMonster 4L65 with a stall converter.
• For setups making 450 HP or more, upgrade to our SportMonster or TrackMonster for maximum reliability and performance.

All units are dyno-tested.

Yes — the 4L65 is a stronger version of the 4L60E from the factory.

• It features upgraded internal components including the input shaft, planetaries, and sun shell.
• Designed specifically for LS-based applications and trucks from 1999+.
• Our upgraded versions can handle over 600 HP, with the TrackMonster 4L65 rated for 1000 HP.

While both can be built strong, the 4L65 is the better platform for high-output LS builds.

No reflash or tuning is required for 4L60 or 4L65 replacements in factory applications.

• Simply disconnect the battery during install and clear all DTC/fault codes before driving.
• The vehicle’s PCM will relearn shift strategy automatically.
• We include a full step-by-step guide in our Installation Manual

Proper code clearing and Installation is key to smooth operation and long-term performance.

No, fluid must be purchased separately. We offer special discounted prices and even cheaper shipping options when you bundle with our fluid at checkout.

Returning your core is simple. Once your old transmission is ready for pickup, you can start the return process online or call our Customer Service Team.

• Use our Core Return Form to submit your pickup request.
• Or call 800-708-0087 and our team can help schedule your return freight pickup.

Please Note:

• The customer is responsible for return shipping.
• A flat-rate fee of $364 will be deducted from your core refund to cover return freight and handling unless round-trip shipping was prepaid upfront.
• The returned core must be the same model and not cracked or damaged beyond rebuild.

Our goal is to make this process as easy as possible. If you have questions about your core return, give us a call and we’ll help.