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The Boss Hog 47012 Night Stalker Series Torque Converter is built for GM TH350 and TH400 automatic transmissions. It delivers a stall speed of 2200–2800 RPM and is ideal for mildly upgraded or near-stock street-driven vehicles. With a 12" factory core and 10.75" bolt circle, it provides dependable performance and smooth engagement.
Crafted in the USA with quality components, this converter features a CNC-machined 30 spline turbine hub, hardened chromoly impeller hub, Torrington-style bearings, and a heavy-duty stator. Every unit is digitally balanced, leak-tested, and ready to handle real-world use.
Fitment Note: Will not interchange with TH350C. Compatible with TH400 when used with the correct flexplate.
Upgrade Tip: If you've upgraded the intake, headers, cam, or gears, consider moving up to the Street Bandit Series. For nitrous or forced induction builds, step up to the Outlaw Racing Series.
Key Features
2200–2800 RPM stall speed range
Fits GM TH350 and TH400 (requires correct flexplate for TH400)
Will not fit TH350C
12" factory-size core
10.75" bolt circle
30 spline turbine hub (CNC machined)
1.703" crank pilot
Bolt size: 10mm x 1.5 pitch (Class 10 or stronger)
Hardened chromoly impeller hub
Torrington-style incased bearings
Modified extreme-duty stator
No anti-balloon plate
Fins are four-corner tack welded or furnace-brazed
Leak and pressure tested
Digitally balanced
Steel construction with black painted finish
Made in the USA
Sold individually
Vehicle Fitment
GM vehicles with TH350 automatic transmission
Also fits TH400 with proper flexplate
Not compatible with TH350C
Ideal for lightly modified or factory-spec street applications
What’s Included
1x Boss Hog 47012 Night Stalker Torque Converter
Installation Tips
Use Type F transmission fluid
Install an auxiliary transmission cooler
Apply blue Loctite to all 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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