Power through the toughest jobs with the StreetMonster 4L85E transmission, the ultimate 4-speed automatic built for heavy-duty trucks, SUVs, and high-performance beasts. Renowned for its legendary durability and high torque capacity, the 4L85E is engineered to dominate in towing, hauling, and high-powered applications. With a rugged design and reinforced internals, this transmission is your go-to for reliable, long-lasting performance under the most demanding conditions. Built to handle up to 450 horsepower and 440 lb-ft of torque, the 4L85E doesn’t just survive under heavy loads—it thrives. Featuring smooth, electronically controlled shifting and a lockup torque converter, it delivers efficient power and crisp performance while maximizing fuel economy. Whether you’re hauling a heavy trailer, crushing off-road terrain, or taking on high-performance challenges, the Monster 4L85E delivers unmatched strength and reliability.
Note
Was told the transmission was an upgrade from the stock transmission, 1,500 more naturally. Then was told the transmission would take 6 weeks because they needed to “build” the transmission. My order arrive 10 days after ordering. That should be a great thing right???….NOPE. After having it professionally installed, broke in and serviced…..this transmission is junk. All towing capabilities GONE! Ate the core deposit of $500 (seeing as it was going to be $250 to ship the core) so I can have the original transmission PROFESSIONALLY rebuilt. If you’re thinking about purchasing from this company i would recommend anywhere else. Trash product
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:
Extend warranties are included on all Transmission Purchases read more HERE.
No — we offer a $364 Flat-Rate One-Way Shipping to any Address.
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.
Please Note:
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.
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