The Bottom Line
An overview of the TH400 transmission shows it is a durable transmission that can give a good performance. The TH400 was used in a wide range of cars from GM as well as other manufacturers. Interestingly, the transmission can be adapted for use in several engines today.
How much horsepower can a Turbo 400 take?
About 400-450 HP/TQ is the limit on the stock TH400. With ONE almost free modification and some minor valve body calibration changes, 800 HP on an otherwise stock TH400 is not a problem if it’s assembled well (good endplay, etc), and the 34 element sprag is a wise addition above 450 HP or any drag usage.
Is a Turbo 400 a 4 speed?
The Turbo 400 was placed in many cars across GM as well as other car manufacturers during its long production life. Overall the transmission remained in production an impressive 27 years before it was eventually replaced by a 4 speed electronically controlled transmission, the 4L80E, in 1991.
Is TH400 and Turbo 400 the same?
They are, for the most part, interchangeable on the same vehicles; however, you would normally find the TH400 in larger engine applications because they are able to function more reliably at higher engine rpms.
What’s better TH350 or TH400?
They are completely different transmissions. The Turbo 400 is larger, longer, and heavier than the Turbo 350 and was designed to live behind higher-torque applications such as big-blocks.
How much HP can a powerglide handle?
With all the available upgrades, both the Powerglide and the TH400 are capable of withstanding an incredible 3,500 horsepower.
How can I tell if I have a 400 Turbo transmission?
Another quick way to identify a Turbo 400 is to look at the kick-down mechanism. Unlike the Turbo 350, instead of a “kick down” cable, it uses an electrical slide switch, which is controlled by the throttle linkage. Generally, in ’68-’71 vehicles, the switch is located on the carburetor.
How much HP will a TH350 handle?
The Stage 1 TH350 is rated up to 450 hp. Those seeking something a little stronger can check out the Stage 2 version (PN PA35102) that holds 550 hp and retails for $1,500 with a real world street price of $1,175 from most vendors.
Does the TH400 have overdrive?
Some refer to the 4L80E as the TH400 with an overdrive ratio, as much of the internals are interchangeable. TCI has a complete line of 4L80E transmissions in the Street Fighter and Super Street Fighter trim levels.
Will a Turbo 400 bolt to an LS engine?
“The TH350, TH400, and Powerglide are a direct bolt-on for an LS engine,” explains TCI’s Winstead.
Can I replace my 700R4 with a TH400?
Re: Replacing my 700R4 with a TH400 Need Help!
The four-pin plug from your 700R does not get re-used on the TH400. The throttle valve cable doesn’t get re-used either. The 400 downshifts using modulator vacuum and an electrical switch attached to the gas pedal or a fabbed switch mounted on the throttle linkage.
How many gears does a TH400 transmission have?
The TH400 is an automatic shift, three-speed, longitudinally positioned transmission. It is widely regarded to be a supremely durable and legendary transmission. The TH400 is conservatively rated at 450 ft. lbs.
What makes a TH400 shift?
In a stock TH400 all W.O.T. shifts are a balance between the governor & line pressure. 1-2 is also a “forced” shift. You can leave the lever in low but it will still shift to second gear when the governor overrides the line pressure.
Whats the difference between a TH400 and a 4L60E?
Much to our surprise, the most significant difference between the TH400 and the 4l60E transmission is the first gear ratio — the 4L60E has a 3.06 first gear, 1.62 second, 1.00 third, and a . 70 overdrive. The TH400 and 4L80E both come with a 2.48 first gear, 1.48 second, and 1.00 third gear.
How much oil does a Turbo 400 transmission take?
You can expect to use between 11 and 12 quarts of fluid in the stock version.
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