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Turbo 400 TH400 Heavy Duty Transmission 4WD 4x4
Turbo 400 TH400 Heavy Duty 4WD 4x4 Transmission

Turbo 400 TH400 Heavy Duty Transmission 4WD 4x4


Custom built to handle up to 550hp/500tq.


Questions? Call Us 800-708-0087

Build Your Order Online

Torque Converter
Shift Firmness
Case Color (shades may vary*)
Output Shaft Length (End of case to end of shaft)
Pan Style
Core and Warranty Options (Please Select One)
A) We'll pick up and Build Your Original Core - 3 Yr Warranty activated when order ships [+$150.00]
B) Return your core using our Core Return Service within 30 days of shipment - 3 Yr Warranty activated when core received [+$250.00]
C) No Core will be returned - Pay Core Fee to Activate 3 Yr Warranty [+$500.00]
Warranty Information (Check Box to Acknowledge)
All warranties are contingent upon core returns and/or fees. If the Transmission & Converter cores are not returned within 30 days or a core fee is not paid I am opting out of any warranty coverage.
White Glove WOWanty Upgrade
Popular Accessories (These have been Discounted for your transmission package!)
12 Qts. of Burn Rubber Brewery Premium Synthetic Trans Fluid [+$149.93]
Fillertube & Dipstick [+$39.00]
Trans Cooler Kit #1403 [+$49.95]
Torque Converter Bolts (3) [+$9.99]
Universal Dust Cover [+$25.00]
Transmission Flush - Dr. Tranny Kooler Kleen [+$19.98]
Transmission Flush - Dr. Tranny Kooler Kleen [+$19.98]
Give Me A Name
Time commitments may vary as this is a custom built transmission

Mega Monster Transmissions
Engineered to Dominate, the Turbo 400 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 500 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 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 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.


*Special Note: If you are planning a direct transmission swap it is recommended to re-use your existing extension-housing and speedometer gear for your new unit. This Monster 700R4 Transmission does not come equipped with a new Speedometer Gear. Certain vehicle specific extension-housings may not be available with this unit. In most cases, you will be required to swap your original extension-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 extension-housing will need to be reused.

Thank you to Javier for assisting me and thank you to Monster for giving me some good products.
I have been dealing with Javier as far as my order and it has been a pretty good experience. He''s always anserwed my emails and my calls. I have ordered both a Turbo transmission and and a 208 transfer case from you guys and you seem to have everything I need. The ordering process is easy. While I''ve been overseas, I''ve been shopping around. I found that Monster had everything I needed and had good prices. Thank you to Javier for assisting me and thank you to Monster for giving me some good products. I can''t wait to get back home to the United States and install everything. I''ll be sure to order more from ya''ll in the future. Thank you very much.
Verified Buyer: 
I drove for the first time yesterday with my Turbo 400 and it shifts freaking great!
I drove for the first time yesterday with my Turbo 400 and it shifts freaking great! It shifts smooth and has a a lot of power. The fluid is great in it. The guys at Monster Transmission are extremely knowledgeable. They know what they''re doing and they are really good at what you do. They get your stuff to you fast. It''s just a really great product and the price is great. I''d recommend Monster Transmission to anybody. I appreciate you guys for all of your hard work.
Verified Buyer: 
The guy Tom who helped me out provided really good service. You know it was fast, easy, very explainable, made everything make sense. And, yeah Monster Transmission has definitely been a good you know company to buy from. You know I appreciate the help. It was hassle free and just the service over all was supreme and I really appreciate it. Thanks guys and have a good Christmas.
Verified Buyer: 
Hey Corey - and the team at Monster! I just wanted to let you know we got our transmission and transfer case in the truck last weekend. I've been driving the truck all week and it's running perfect. I'd like to just pass along how grateful I am for the help you gave us, getting this truck back together!! I've not had much luck with transmissions in this truck. It's lifted 6" - plus about 3" more in body lift. I kept putting used transmissions in the truck and never changed the transfer case - but kept having problems with leaks and other stuff. So far - I've been driving it all week and I'm finally starting to have some confidence in this truck!! Well have a great weekend, and thanks again for helping me with this purchase. :)
Verified Buyer: 
The transmission turned out great. It shifts really hard and firm.
We''re doing a conversion on my father''s Suburban. The transmission turned out great. It shifts really hard and firm. It''s a great product and and the service was good. Thanks a lot guys. It''s a great product! Keep them coming!
Verified Buyer: 
I am very impressed
I ordered a transmission with you guys and I am very pleased with the turnout and by what my car does. I am very impressed. I have a 1972 LeMans and I put an Overdrive Transmission in it. I drive it on the highway now. I have 411 Gears in the back and my RPM went from 3400 to 2200 at 70 MPH. I''m very impressed. I''m the first one out of my group of muscle car that has tried your transmissions and hopefully all of my other friends, including my brother, will do the same thing once they get the feel of it and everybody sees the power it has when you drive it. I''m very impressed and you guys build one hell of a transmission. If you have any questions I would love to tell you anything that you need to know. Thank you
Verified Buyer: 
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