The Boss Hog 48400 is a Night Stalker series lock-up torque converter for the GM 700R4 and 200-4R (298mm) automatic transmissions, on the 27-spline three-step input shaft. It is a stock-stall replacement with no added stall, designed to strengthen the weak points of the factory converter with a much thicker, stronger lock-up liner, a modified heavy-duty stator, an extreme-temp heavy-duty O-ring, and new Torrington-style encased bearings so it handles more power and runs cooler. It uses the factory 12 in core, a 10.75 in bolt circle, and a factory 1.703 in crank pilot. To verify the input shaft, count the smaller set of splines. Every unit is leak and pressure tested, digitally balanced, and made in the USA.
- Series: Night Stalker
- Transmission: GM 700R4, 200-4R (298mm, lock-up)
- Stall Speed: Stock, no stall added
- Input Shaft: 27-spline, three-step (count the smaller splines)
- Core: 12 in (factory)
- Bolt Circle: 10.75 in
- Lock-Up: Yes (extreme-duty); extreme-temp heavy-duty O-ring
- Impeller Hub: Hardened chrome moly
- Bearings: Torrington-style encased
- Stator: Modified heavy duty
- Crank Pilot: 1.703 in (factory)
- Bolt Size: 10mm x 1.5
- Anti-Balloon Plates: No
- Balance: Digitally balanced
- Build: Leak & pressure tested; made in USA
- Part Number: 48400
WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
FAQ
What transmission does the Boss Hog 48400 fit?
It fits the GM 700R4 and 200-4R (298mm) lock-up transmissions on the 27-spline three-step input shaft. Count the smaller set of splines to confirm.
What is the stall speed?
The 48400 is a stock-stall replacement with no added stall.
Is this a lock-up converter?
Yes. It uses an extreme-duty lock-up with a thicker, stronger liner than the factory converter.
How do I confirm it fits my input shaft?
Count the smaller set of splines that stick out the farthest; this unit is 27-spline. The 30-spline 700R4 units (48441, 48442, 48453) use a different input shaft.
Which Boss Hog series should I choose?
Boss Hog groups these converters by build level. Night Stalker suits stock to mild combinations, Street Bandit is the step up once you have upgraded two or more items such as intake, heads, headers, exhaust, cam, or gearing, and the Out Law racing series is for power adders like nitrous, a supercharger, a turbocharger, or a trans brake.