What does a Turbo 400 transmission look like?

The TH-400 uses an oblong-shaped pan with one side having a “hump” in the pan and one side is curved while the other two sides are straight. The TH-400 pan also has two circular indentations on the humped side of the pan. Measure the transmission.

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 do I know if I have a TH350 or TH400?

You’ll know it’s the TH350 if you have the fitting attached to the right frontal side of the transmission. However, it is the TH400 if this fitting is at the transmission’s front-rear side.

Is a TH400 the same as a Turbo 400?

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.

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How many gears are in a Turbo 400?

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.

What kind of transmission do I have?

Open the driver’s side door and find the white card on the side of the door that is filled with small black lettering. This card contains specific details about the year the car was made, its transmission, engine specifications and other details. Underneath or beside the “TR” symbol will be a number code.

Does Turbo 400 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. Back in the late-’60s gas was cheap and highway cruising speeds were lower.

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.

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.

How do I tell what year my TH400 is?

A small metal tag is affixed to the passenger side of the transmission just above the pan rail. This identified the model year, engine type, date, and transmission serial number. The partial VIN is stamped on the driver side of the transmission just above the pan rail.

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What transmission can replace a turbo 400?

See all 29 photos The Turbo 400 is supported with a transmission jack for removal. Because the Gearstar 700-R4 has similar dimensions to the Turbo 400, it is easy to swap without extensive modifications. Gearstar and Summit Racing Equipment have provided virtually everything necessary to do this swap.

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.

Which is better TH400 or 4L80E?

4L80E vs.

Though 4L80E race transmissions are quite similar to TH400 in terms of strength and parts used, however, there are differences, such as the added overdrive gear, advanced electronic controls, and a lock-up torque converter. 4L80E transmissions have nearly 25% overdrive and are 4 inches longer than the TH400.

Is a Turbo 400 a 3 speed or 4 speed?

The Turbo 400 transmission was a 3 speed automatic transmission developed by General Motors. This was one of General Motors editions of the Hydramatic transmission series.

What does TH400 stand for?

The Turbo Hydra-Matic 400 transmission was General Motor’s heavy duty, 3 speed automatic transmission. It first appeared in 1964, where it was used as a production option for Cadillac cars.

When did GM stop using TH400 transmission?

These were mated to a Borg Warner Quadra-Trac or Dana 20 transfer case. The TH-400 was also used behind the Buick 350 in Jeep J-series pickups and SJ-series Cherokees and Wagoneers. Chevrolet and GMC used the TH-400 in 4WD truck applications with New Process transfer cases well until 1991.