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The Boss Hog 48400 Night Stalker Series Torque Converter is a stock replacement unit for GM 700R4 and 200R transmissions using LT-type engines with a 3-step, 27-spline input shaft. Built to original factory stall specifications, this lock-up converter delivers reliable OEM-style performance with no added stall — ideal for daily drivers and stock rebuilds.
Precision-built with a 12" factory core, this converter includes Torrington-style incased bearings, a heavy-duty stator, and a high-temp O-ring for long-lasting reliability. Digitally balanced and leak-tested in the USA.
Upgrade Tip: For builds with upgraded intake, exhaust, cam, or gearing, consider moving up to the Street Bandit Series. For power adder setups, choose the Outlaw Series.
Key Features
Stock stall range – no additional stall added
Lock-up compatible
Fits GM 700R4 and 200R transmissions (LT-type, 3-step input shaft)
12" factory-size core
10.75" bolt circle
27 spline input shaft (count the smaller splines)
1.703" crank pilot
Bolt size: 10mm x 1.5 pitch
Torrington-style incased bearings
Modified heavy-duty stator
Extreme-duty lock-up
Extreme temp heavy-duty O-ring
No anti-balloon plate
Fins are 4-corner tack welded or furnace-brazed
Leak and pressure tested
Digitally balanced
Steel construction, black painted finish
Made in the USA
Sold individually
Vehicle Fitment
GM vehicles with 700R4 or 200R automatic transmissions
LT-type engine setups using a 3-step, 27-spline input shaft
Intended for stock replacement and daily driver applications
What’s Included
1x Boss Hog 48400 Night Stalker Lock-Up Torque Converter
Installation Tips
Use Type F transmission fluid
Install an auxiliary transmission cooler
Apply blue Loctite on 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.
We have been committed to offering all of our customers the lowest pricing throughout our website day in and day out. We value your business so much that we go a step further than our competitors. We use a third party software that proactively monitors all our competitor's websites/pricing so that we can make adjustments accordingly if needed to have the lowest prices. Thats right, no need to spend hours searching for the lowest prices, as ours will be the lowest.
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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