Is a TH400 a good transmission?
The TH400 is an automatic shift, three-speed, longitudinally positioned transmission. It is widely regarded to be a supremely durable and legendary transmission.
What causes a Turbo 400 to slip?
The slipping happens when you are driving or changing gears and may accompany odd noise. Since the primary role of a turbo 400 torque converter is to efficiently convert engine power into hydraulic pressure for the transmission to use for shifting gear, if it is malfunctioning, you may experience slipping in overdrive.
Which transmission is 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. That doesn’t mean the Turbo 350 is weak in comparison.
What does the vacuum modulator do on a Turbo 400?
What does the vacuum modulator do on a Turbo 400? It is equipped with a vacuum modulator that senses change in the engine’s vacuum due to throttle position and load changes. As these changes occur, the modulator adjusts the shift timing of the transmission according to the demand of the engine.
How much HP can a TH400 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.
What happens if you overfill a TH400 transmission?
The 400 is exactly like any other, in that if overfilled, it will froth and foam, and vent fluid, and yes, the overfilling can lead to damage.
Are all TH400 transmissions 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.
How much HP can a Turbo 400 handle?
How hard is it to rebuild a TH400?
The TH400 is also a very simple unit, and is relatively easy to overhaul. It does not require a lot of special tools, or special procedures. Most hobbyists have great success building their own units at home.
Does a TH400 need a kickdown?
Registered. th 400 does not use a kick down cable but does have a electric solenoid for kickdown. A manual valve body does not require use or retain a kickdown function.
What are the symptoms of a bad transmission modulator?
When you have a bad modulator valve, some or all of the following symptoms will begin to manifest themselves:
- A whistling sound (from a leaking diaphragm)
- White smoke coming out of the exhaust (from a leaking diaphragm)
- Early or late shifting.
- Hard shifts (usually causing the car to jerk)
- A rough idle.