The most common failure in a Turbo 400 is the 2nd gear sprag. This is a mechanical part has to stop the direct drum turning in the opposite direction of transmission rotation
the instant the 2nd gear is engaged. Imagine a 9lb drum turning at engine RPM and has to be stopped instantly. What typically happens is the sprag will wear and break or flip
over causing a loss of 2nd gear. This will happen from a stock 400 to Hi HP units.
The industry for years has worked to improve the problem GM built into the Turbo 400. The industry solution was to use a larger sprag out of a front wheel drive GM transmission
referred to as (Super Sprag). This sprag is larger and has more surface area and it does extend the HP limitation of the 2ng gear sprag. The problem is the Super Sprag is still
a mechanical part, it still wears and fails only at a higher HP level. No one seems to know what HP level this new sprag is reliable. When you shock a mechanical part it will
fail period. That's what happens every time you pull the shifter on your 400 into 2nd gear.
Steve Griner came up with the solution. If the sprag is a mechanical part. It wears and fails due to shock load. How do we permanently fix it. We remove the sprag from the
transmission. No sprag = No sprag Failure. The Turbo 400 EXtreme is a Spragless 400 transmission. That's right!!! There is no sprag to break. The clutches will handle all
the shock you can throw at them. You shock the clutch pack it will slip grab and go down the track. You shock a mechanical part it will explode. The Heart of the EXtreme
Spragless™400 is the valve body built for EXtreme Automatics™ by Griner® Engineering. Steve Griner started from a block of aluminum billet and a clean sheet of paper.
The other guys are still modifying the 40 year old GM cast iron valve body. With the new Valve body the sky was the limit. We removed the 2nd gear sprag, Improved direct
clutch life and designed the fastest shift time in the industry. All this was topped off with a Pro Tree .000 release time Griner trans brake the fastest in the industry.
The spragless technology has been tested for years in 10,000lb Fuel Blown monster trucks where no sprag has ever survived. These trucks must be shifted up and down in and out
of 2nd gear at full throttle. That's some serious punishment. Imagine a 10,000lb truck. On the Dragstrip the spragless has been 6.21 at over 230 in the quarter when the other
big name 3 speed 400s failed. If you are looking for the strongest 3 speed 400 on the planet with the latest innovation The EXtreme Spragless™ 400 is for you.