How much HP can a t400 handle?

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.

How many gears does a t400 have?

three-speed
The GM TH400 transmission is a three-speed automatic transmission that was longitudinally positioned behind the engine. This placement is aimed at providing the best power ratio and durability for rear-wheel drive. The TH400 has been rated at 450 ft.

Is Turbo 400 same as TH400?

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.

Which is better Turbo 350 or 400?

1. Is there a big difference between a Turbo 350 and Turbo 400 – and which one do I want? 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 many speeds is a Turbo 400?

TH-400 transmissions are three-speed automatics, with a 2.48:1 first gear. Reverse gear is 2.08:1 and third gear is an even 1 to 1. Turbo 400s use three tail shaft lengths; the most preferred units for a GM swap would have the short 4-inch tail shaft.

Which is better TH400 or 4L80E?

The 4L80E is just a longer, heavier, overdrive version of the TH-400. It uses the same first three gear ratios but adds a 0.75:1 overdrive. This means that with a 3.55:1 rear gear, the overdrive drops the effective rear gear ratio to 2.66:1.

Does a Turbo 400 have a kickdown cable?

Instead of a linkage or cable, the TH400 uses an electrical switch that is most often mounted on the carburetor. The 12-volt connection is a single spade connector just above the oil pan rail on the driver’s side about halfway back–at least that’s where it is on my TH400.

What does the vacuum modulator do on a Turbo 400?

The vacuum modulator is a vital component of automatic transmissions. It tells the transmission what kind of load is being put on it, allowing the transmission to react with the proper line pressures and shift points.

What transmission can handle 4000 HP?

The Lenco CS1 transmission will control up to 4000+ HP.

Is a TH400 better than a TH350?

Does the TH400 have overdrive?

But the TH350 and TH400 three-speed versions (and their two-speed Powerglide cousin) fall short when it comes to highway cruising. The reason for this is the conspicuous lack of an overdrive gear.

Does Turbo 400 have overdrive?

An overdrive unit is designed to maintain cruising speeds of the vehicle while simultaneously reducing the RPM produced in order to better fuel economy and prevent excess noise and wear made by the various parts of the transmission.

How does a Turbo 400 downshift?

When the throttle linkage reaches a specific point, the cable triggers a mechanical detent valve inside the transmission–allowing it to shift into a lower gear. The Turbo 400 uses an electric switch to trigger a detent solenoid on the valve body to produce the same effect.

How much HP can a gearstar TH400 handle?

Since this Gearstar TH400 transmission was getting the Level 4 package, it gets all the best bells and whistles, like this 300M full-billet clutch hub (left) rated to take over 1,000 hp. The stock cast 400 OE forward clutch hub (right) 300M is only rated to handle 500 hp.

Is the Ford Turbo 400 the best gear set ever?

“The gear set design in the Turbo 400, even in OEM form, is probably the strongest gear set design ever developed by the “big three” auto manufacturers. Even the factory gear sets can handle upwards of 2,000 horsepower without an issue, which is unheard of out of any other transmission.

Is there a monster in a box for a GM TH400?

The Monster-In-A-Box transmission rebuild kit for the TH400 is available for GM vehicles. This kit has available all the parts needed to make your transmission a true Monster. It comes as a performance Mega package and also has a SS variant for those needing a higher horsepower and torque rating.

What is the difference between a gearstar and a Level 4 drum?

A stock drum with spring and roller is only rated to 500 hp, while the upgraded Gearstar assembly is rated to 1,000-plus hp. Heavy-duty carbon fiber bands with reinforced apply lugs in the Level 4 builds have wider lugs (left) than the stock low and reverse bands (right).