StreetMonster Chevy 4L60E Transmission & Converter Conversion Package

In-stock transmissions usually ship the next business day.

Custom builds or out-of-stock units typically ship within 2–4 weeks.

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

We offer the most comprehensive coverage in the industry:

• StockMonster: 1 Year (Extendable to 4 Years with Extend)
• StreetMonster: 2 Years (Extendable to 5 Years with Extend)
• SportMonster: 3 Years (Extendable to 6 Years with Extend)
• TrackMonster: 1 Year (Extendable to 4 Years with Extend)

Extend warranties are optional add-ons available during checkout.

No — we offer a $299 Flat-Rate One-Way Shipping to any address, commercial or residential.

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 year and engine type:

• In 1998, GM introduced the LS1 engine and began using the 4L65 in select vehicles.
• By 1999, trucks with 4.8L, 5.3L, or 6.0L LS engines came with the 4L65.
• If your vehicle is 1998 or older and does not have an LS engine, you most likely have a 4L60.

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

Yes — but only with an adapter kit. This pre-1999 4L60 can be used behind an LS engine when paired with a:

• Flexplate adapter
• Crankshaft spacer

If your vehicle originally came with an LS engine (like a 2003 Silverado), you’ll want to choose our 4L65 transmission instead for direct compatibility.

Great for LS swap projects when used with the correct adapter components.

Yes — you can use a standalone transmission controller with this 4L60E, as long as it's designed for non-LS applications.

• Works great with carbureted engines, early EFI setups, and LS swaps that don’t use factory ECMs.

Tip: Be sure to match the controller to the type of transmission (mechanical vs. electronic) you have.

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 you are ready to return your core, you can initiate the return process in one of two ways:

• Fill out our Core Return Form (available online) using the button below.
• Or call our Customer Service Team at 800-708-0087 to schedule your return freight pickup.

Please Note:

• The customer is responsible for the return shipping cost.
• A flat-rate fee of $299 will be deducted from your core refund to cover return freight and handling. If Round Trip Shipping is not Prepaid Upfront.
• The core must be the same model and not cracked or damaged beyond rebuild.

Our goal is to make this process as seamless as possible — if you have questions about your core return, just give us a call.