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The Boss Hog 49451 Night Stalker Torque Converter is designed for GM LS-based vehicles equipped with 4L60E, 4L65E, or 4L70E transmissions (1998 and newer with 300mm input shaft). With a stall range of 1600–2200 RPM, this converter is ideal for near-stock applications, offering smooth engagement and enhanced drivability while maintaining the benefits of a lock-up design.
Built from a factory-size 12-inch core and tested to strict quality standards, this unit features a hardened chromoly impeller hub, heavy-duty stator, and encased Torrington bearings for long-lasting performance. Each converter is leak-tested, digitally balanced, and proudly made in the USA.
Upgrade Suggestions:
Choose the Street Bandit Series if your build includes aftermarket intake, cam, or exhaust. For setups using nitrous, turbos, superchargers, or a trans brake, opt for the Outlaw Series.
Stall Speed Range: 1600–2200 RPM
Transmission Compatibility: GM 4L60E / 4L65E / 4L70E (1998+ LS with 300mm input shaft)
Lock-Up Compatible: Yes
Core Diameter: 12 inches (factory size)
Input Splines: 30
Crank Pilot Diameter: 1.703 inches
Bolt Circle Diameter: 11.125 inches
Bolt Size: 10mm x 1.5 pitch (Class 10)
Anti-Balloon Plate: Not included
Construction Details:
Hardened chromoly impeller hub
Encased Torrington-style bearings
Modified heavy-duty stator
Extreme-duty lock-up liner
4-corner tack welded or furnace brazed fins
Tested: Leak and pressure tested, digitally balanced
Material: Steel
Finish: Black painted
Made in the USA
Quantity: Sold individually
GM LS-powered vehicles with 4L60E, 4L65E, or 4L70E automatic transmissions
Fits 1998 and newer with 300mm 2-step input shaft
Ideal for daily drivers and light-performance applications
(1) Boss Hog 49451 Night Stalker Lock-Up Torque Converter
Use Type F transmission fluid
Always install an auxiliary transmission cooler
Apply blue Loctite to all torque converter bolts
We are open Monday-Friday from 8am-6pm EST
Yes, customers located in and around the the Piedmont area are welcome to pick up their items from our retail location during normal business hours. Our address is:
Elite Race Fab
1514 Holbrook St Suite D-F
Greensboro, NC 27403
Elite Race Fab offers free ground shipping & handling to our retail customers within the lower 48 contiguous United States on most orders totaling $159.99 and higher, when the item being purchased is not a Freight/LTL item! Orders under $159.99 will be subject to a nominal $13.99 Flat shipping charge. Some exceptions and/or exclusions apply, in those scenarios you will be advised of any additional charges in the item details/description stating shipping exclussions/freight shipping required etc.
In regards to expedited and international shipping each order will need to be quoted on a case by case basis. You can obtain a quote two ways:
- From your shopping cart select "Request a Quote" prior to placing your order. We will review your proposed order and promptly respond with shipping estimates.
- Complete your order ahead of time indicating either expedited or international shipping during the checkout process. We will promptly determine shipping rates for your order and email you for approval and additional payment.
-Give us a call and we can ensure your item is shipped right then, to ensure you have it in time for your deadline.
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As far as price matching, we dont want to write a check we cant cash, but we certainly want to earn your business. With that said, we will go above and beyond to match our competitor's pricing when it is needed. Simply email us, click the live contact button, or give us a call and be sure to have a link to our competitor's site and please factor in any shipping and handling their website will be charging. We will then ensure you get the lowest price, and either match or beat their pricing.
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