Turbo 400 TH400 Transmission High Performance Race Transmission 4" Tail, Racing Th400, Race Th400, Racing Turbo 400, Performance Th400
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Turbo 400 TH400 High Performance Race Transmission 2WD with Free Transmission Fluid
Turbo 400 TH400 High Performance Race Transmission 2WD with Free Transmission Fluid

Turbo 400 TH400 High Performance Race Transmission 2WD with Free Transmission Fluid


The Turbo 400 SSMega Monster transmission is tough enough to withstand the rigors of even the toughest street machines delivering tire-spinning shifts race after race. Now Includes the best Full Synthetic Transmission Fluid on the Market provided by Burn Rubber Brewing Co. For Free! INCLUDED FREE - No Fault Warranty A 1-time no questions asked repair or replacement. Covers Shipping, Freight claims, Installation errors, overheating and more!

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Torque Converter
Torque Converter Perf Upgrades
Case Color (shades may vary*)
Pan Style
Other Performance Upgrades
Smooth Cam Drum (+$275.00)
SFI Approved Trans Scatter Shield (+$379.00)
Lower Planetary Gear Sets (+$3,500.00)
Sonnax Smart-Tech Drum **HIGHLY RECOMMENDED** SEE DESCRIPTION (+$3,500.00)
Core and Warranty Options (Please Select One)
Note: A core deposit is required on this product please choose an option below
A) We'll pick up and Build Your Original Core - 90 Day Warranty activated when order ships (+$200.00)
B) Return your core using our Core Return Service within 30 days of shipment - 90 Day Warranty activated when core received (+$250.00)
C) No Core will be returned - Pay Core Fee to Activate 90 Day Warranty (+$600.00)
WOWanty Plans *Must return core or pay core fee to extend warranty
Popular Accessories (These have been Discounted for your transmission package!)
Free 12 Qts. of Burn Rubber Brewery Premium Synthetic Trans Fluid
Torque Converter Bolts (3) (+$9.99)
Universal Transmission Mount (+$19.94)
Transmission Flush - Dr. Tranny Kooler Kleen (+$19.98)
Universal Dust Cover (+$25.00)
Trans Cooler Kit #1403 (+$49.95)
Fillertube & Dipstick (+$84.99)
Warranty Upgrade
Included FREE - No Fault Warranty
Time commitments may vary as this is a custom built transmission

SS Mega Monster Transmissions
Engineered to Dominate, the Turbo 400 SS Mega Monster transmission is tough enough to withstand the rigors of even the toughest street machines delivering tire-spinning shifts race after race. It is ideal for vehicles powered by engines producing up to 750 horsepower using pump gasoline. Equipped with a Manual/Automatic valve body, most units allow you to manually shift the vehicle into each gear change or, by placing it in the drive position, remain fully automatic. In either mode, you get a racetrack shift that bangs through the gears giving you all the right to say "Eat My Shift!". When you use the manual gear selection feature, the SS Mega Monster upshifts and downshifts when you move the shift lever, please note, in order to have complete control of the RPM shift timing you must upgrade to a full manual valvebody. When you select the normal drive position, the transmission retains its firm, automatic shifts for the ease of driving you look for in an automatic transmission.

The SS Mega Monster Transmission features: the latest technology in our industry with only the best internal components for increased strength, dependable performance and monster torque capacity. All Monster transmissions are custom made in the USA and quality checked to ensure your peace of mind. For the system to operate properly, all throttle linkage, vacuum lines and kick-down components must be connected and adjusted properly.

- The chrome pan in the product photos is an upgraded item that is shown as a related product that you can add to your cart.

 New Paper Gaskets, O-rings, Teflon rings
 New Rubber Seals for Drums & Pistons
 New Steel Check Balls
 New Double Lip Seals (Front & Rear)
 New Governor Filter

 New Kolene Steel Plates
 New High Performance Race Clutches
 New Brass Washer Kit "NO PLASTIC HERE"
 New Bushing Kit 
 New Torrington Bearing Kit

 Superior High Performance Shift Reprogramming Kit
 Super Pump
 New Pump Bushings
 New Stator Bushings, Rotor Gears & Sealing Rings
 Modified Boost Valve Assembly
 New Boost Valve Spring

New HD 34 Element Sprag
 Updated / Modified Accumulators
 Heavy Duty Kevlar Bands
 High-Temp. Tolerant
 Improved Holding Power
 Added Strength At Strut Support

 Updated & Modified Governor with Spring Kit and Nylon Gear
 Recalibrated Valve Body
 Recalibrated Shift Plate
 New High Flow Filter
 New Low / Reverse Heavy Duty Sprag
 New Heavy Duty Accumulator Spring
 New Modulator

*Special Note: If you are planning a direct transmission swap it is recommended to re-use your existing tail-housing and speedometer gear for your new unit. This Monster 700R4 Transmission does not come equipped with a new Speedometer Gear. Certain vehicle specific tail-housings may not be available with this unit. In most cases, you will be required to swap your original tail-housing (this will NOT void your warranty). Please Contact Us to purchase a proper speedometer gear for your application or if you are unsure if your tail-housing will need to be reused.

****Sonnax Smart-Tech Drum Modules

Sonnax Smart-Tech drum modules for racing GM TH400 transmissions improve on-track performance and consistency, leading to quicker ETs, more wins, and greater reliability. The TH400 is preferred for its overall durability and multitude of available ratios, but is known to be heavier and less efficient than the popular two-speed Powerglide. Part of the TH400 inefficiency results from the fact that the direct drum counter-rotates, spinning backwards in 1st gear, brakes to a complete stop on the 1-2 shift, then goes from 0 RPM to input RPM on the 2-3 shift. Significant energy is wasted through this cycle that robs power, upsets traction on the shifts, and contributes to broken internal parts.

Compared to aluminum direct drums, the Smart-Tech drum module reduces the weight of the counter-rotating components by over 3.3 lbs.! And more significantly, because the weight of the Sonnax counter-rotating parts is closer to the centerline, there's a 68 percent reduction in energy required to stop and restart during the 1-2 and 2-3 shifts. The benefits are increased wheel horsepower, better acceleration, less shock on the shifts, and improved durability.

* Complete kit (34555-01K) replaces both forward and direct drums and includes everything from intermediate sprag to the pump; a selection of Sonnax input shafts is available separately.
* 100 percent new content, no used core pieces
* Includes larger-diameter, 36-element sprag and sprag race that works with OE intermediate clutches
* Includes six-friction forward clutch pack and seven-friction direct clutch pack


* Forward Piston Housing
* Forward Piston
* Forward Piston Return Springs (16)
* Forward Spring Retainer
* Forward Snap Ring
* O-Ring 1.674 in.
* Lip Seals (2)
* Direct Housing Assembly
* Direct Piston
* Direct Piston Return Springs (26)
* Direct Spring Retainer
* Direct Snap Ring
* O-Ring 2.737 in.
* Sprag Shaft
* Front Sprag Retainer Plate
* Heavy-Duty Sprag 36 Element
* Outer Sprag Race
* Rear Sprag Retainer Plate
* Sprag Retainer Screws (4) 6-32 x 5/16 in.
* Quad Ring Seals (2)
* Anti-rotation Seal Rings (2)
* Drum
* Pressure Plate
* Outer Snap Rings (4)
* Bearing Small
* Forward Clutch Hub
* Bearing Large
* Direct Clutch Hub
* Steel Clutch Plates (4) .060 in.
* Steel Clutch Plates (11) .077 in.
* Friction Clutch Plates (13) .080 in.
* Clutch Separators (60) .103 in.

I bought the TH400 stage2 i then put in a 3200stall behind my trucks 515hp 372 then with a 250 shot of NOS 745hp, The transmission has held up perfectly!
Verified Buyer: 
turbo 400
great tranny finally installed, would buy from you guys again thanks alot snappy shifts
Verified Buyer: 
Just want to give a big thanks to Tom and Charlotte, they were very helpful. And im extremely happy with the transmission, we’re using it, its working hard doing a great job never missing a beat. Thank you.
Verified Buyer: 
Would like to express my upmost appreciation for you guys. First off Jay is the man. I had sent him these pics and he told me to send them here. I had my brotha of RealDeal Designs stripe the transmission. Hope you like. You guys are more than welcome to use these pictures for whatever. Thankyou once again. I am in Boston right now getting ready to drive to Kansas. I live near a drag strip out there and lots of people looking for built turbo 400 with manual bodies and trans brakes. I will let them all know about you guys. Thankyou once again.
Verified Buyer: 
Monster helped me put together a package with a turbo 400.
We exchanged my transmission from a 4L60E which blew up several times (I lost 3rd and 4th gear). Monster helped me put together a package with a turbo 400. When I ran into problems getting the adaptors and the conversion shafts for it to go into my truck, they went up to bat for me and got this all lined up. They got the transmission set up and shipped it to me. I live in Alaska and they shipped it to my shipper and got it to me. It''s installed in my truck and it works great. Thank you very much for all of the Monster people''s help and advice in parts.
Verified Buyer: 
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