We build 2 levels of Sprag Turbo 400s. Our entry level 400 will handle more power than some competitors best unit. If you are looking for the strongest TH400 built, you have come to the right place. We only build sprag units up to 1300HP.
All Units We clean all parts and perform a complete part by part inspection to ensure that we use the best cores. We disassemble each Gear set and inspect every single gear pinion and replace all pinion thrust washers. We cryo treat our gear sets after they have been rebuilt. The bushings are replaced with better than OEM bushing kits. We pay attention to every detail. We start with Hi Quality Parts that makes for a Hi Quality finished product. We only Use Griner Billet Valvebodies on all of our 400s.
TH400 Stage 2 Ford 5.0
Ford 5.0 Ultrabell
Stage 1 1200HP
Manual Reverse Shift Pattern
Griner G-10 Pro Transbrake
Media Blast Case Prep for Racing
Hytuff Input Shaft
CNC Forward Drum for Exclusive Shaft Retaining System
Intermediate Snap Ring Case Support
Clutch Hub Rollerised
2.48 Rollerised Gear Set
Rear Case Torrington Thrust Bearing
Torsional Mains Shaft
Harden Stator Support
H.D. 34 Element Sprag
Tube Shaft Modification (Keeps Direct Drum Parallel Extends HP Capacity of Sprag)
Low Drag Option
Tensioned Sealing Rings
High Energy Expanded Capacity Cutch Packs
ARP Stainless Fasteners
Deep Pan
Hi Flow Filter Assembly
1 Year Warranty
Call for pricing
Options JW Ultra Bell GM $295 JW Ultra Bell Ford and Most others $395 Light Weight Gear Set $195 VSS Package GM and Ford $275
Safe Neutral Option $150
Light Weight Gear set (left)
Torrington Rollerised (left)
Snap Ring Case Support
Phil McGloin 9.38@146
Stage 2 1300 HP
Extreme Automatics Stage 2 is designed for Pro tree heads up racing for applications 1300HP or less. This trans has been 8.50s @ 155 MPH in a 3450 Car. The Stage 3 has more standard than the other guys have options. The Griner Trans Brake is the fastest in the industry and has been used on more record setting cars than all the other manufactures combined. The Standard Stage 3 Has 7lb less rotating mass than a stock TH400. The Stage 2 if you are looking for a super strong 400 with a lightning fast Trans Brake, Lightning Fast shifts and a little less weight.
Griner Pro Tree Billet Aluminum Valve Body .000 Release Time
Reverse Shift Pattern / Safety Reverse Lockout
Case is Media Blasted and Prepped for Racing
Billet Harden Stator Support
300M Billet Input Shaft
CNC Forward Drum for Exclusive Shaft Retaining System
Intermediate Snap Ring Case Support
Billet Clutch Hub
Clutch Hub Rollerised
2.48 Light Weight Rollerised Gear Set
Rear Case Torrington Thrust Bearing
300M Billet Main Shaft
H.D. 34 Element Sprag
Precision Ground Direct Drum (inner Race)
Tube Shaft Modification (Keeps Direct Drum Parallel Extends HP Capacity of Sprag)
Low Drag Option (Torrington Bearings used in lieu of Thrust washers)
Tensioned Sealing Rings
Maximum Duty Hi Energy Clutch Packs
H.O. Pump Assembly
ARP Stainless Fasteners
Deep Cast Alum Pan or Deep Derale Cooling Tube Pan
Hi Flow Filter Assembly
1 Year Warranty
Call For Pricing Options Safety Neutral VB $175 JW Ultra Bell $295 JW Ultra Bell Ford and Most others $395 2.48 Straight Cut Gear Set $395 (Includes Low Drag Option) 2.10 Gear Set $1495 Hi Stall Boost Builder Option $725 Aluminum Direct Drum $695 Aluminum Forward Drum $695 Super Light Option $1895 ( Removes 20lbs of Rotating Mass) VSS Package for GM and Ford $275
****Boost Builder Hi Stall Option****
Boost Builder is a Hi Stall option that is built into the transmission to allow a temporary increase in stall. This option will increase the Stall of any torque converter approximately 1000 RPM. Typically a Turbo car would use boost builder to increase stall to spool the turbo faster. When the turbo boost is up the boost builder is then turned off so the converter will then return to normal stall for top end slip efficiency. We have seen this setup spool large turbos and maintain 3% top end slip percentage with the proper torque converter. The Boost builder will work with any torque converter. Are you tired of the torque converter stall game? Is your converter so tight you cant bring your Turbo car up? Does your turbo car spool up fast but has excessive slip on the top end? Boost Builder can fix all these problems. Give us a call and we can explain how Boost builder can work for you.
Precision Ground Direct Drum
TH 400 Ready to Ship
300M Input Shaft
300M Mainshaft
Griner 34G10 Pro Tree VB
A work of ART
The Competitors Super Sprag Exposed
Extreme Automatics does not install the so called Super Sprag. The 34 element sprag in a properly build transmission has proven to be reliable to about 1300HP. The Super Sprag has proven to hold even higher HP. I know you are asking yourself where I am going with this. The main problem with the Super Sprag is the cost factor. The typical drum cost from $600-$1000 in addition to the transmission build. Although It does increase the HP capability of the 2nd gear shift it still wears, it still breaks and you will never get the increased HP capability for the cash you spend. If you are making over 1300HP or just want something more reliable than a HD 34 element sprag. Check out our Extreme Spragless 400. You will see for yourself when you add a super sprag to a build with the increased cost you could have a Spragless Transmission.
2 Griner Brakes In Action (The Orange Car won this Race)
