Is a th400 a good transmission?


Is a th400 a good transmission? 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 good is a Turbo 400 transmission? 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.

How much HP can a Turbo 400 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.

Can you daily drive a turbo 400? The th400 isnt bad daily driven and fuel mileage can be obtained very easily. Keep in mind though you just dont leave a th400 in 3rd gear and drive it. You have to shift 1-2-3 and when you stop shift back to first.

Is a th400 a good transmission? – Related Questions

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.

Does a 400 Turbo transmission have overdrive?

The Turbo 400 has earned the reputation of a tough, reliable transmission that can survive harsh duty, but is there a better alternative? Although not often considered as such, much like the Turbo 400, the 4L85E is a solid contender for use in heavy, high-horsepower vehicles, and has the added benefit of an overdrive.

How much power can a Turbo 350 transmission handle?

The Stage 1 TH350 is rated up to 450 hp.

Is a Turbo 400 the same as a 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.

How much HP will a stock powerglide handle?

With all the available upgrades, both the Powerglide and the TH400 are capable of withstanding an incredible 3,500 horsepower.

How do I know if my Turbo is 350 or 400?

The TH-350 uses a square pan, with one corner cut off. 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.

How many gears are in 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.

Will a TH400 bolt up to a 350?

You might be able to swap that B-O-P T-400 for a Chevy T-350. The T-350 is lighter and will offer less internal drag, so the swap would benefit you. A PowerGlide loses about 18 horsepower to parasitic drag, a T-350 comes in at about 38 horsepower and a T-400 requires about 45 horsepower.

Is a TH350 stronger than a 700r4?

According to the big trans guys they are actually stronger than the 700; smaller, lighter, and a better 1st gear ratio. I have had a mildly built 200-4R behind a 462 in a 4000# car for over 10 years with no issues.

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.

How much does it cost to have a TH400 rebuild?

The “complete kits” are $300-$700 depending on the quality and components. Figure most “consumer” shops are going to put about $300-$400 materials, and about $200-$400 labor. “Performance” shops will likely add about $200-$500 on top of that, depending on level of work done.

Who makes Turbo 400 transmission?

Turbo-Hydramatic or Turbo Hydra-Matic is the registered tradename for a family of automatic transmissions developed and produced by General Motors. These transmissions mate a three-element turbine torque converter to a Simpson planetary geartrain, providing three forward speeds plus reverse.

Is a Turbo 400 the same length as a 700R4?

Registered. edit: okay, AA sez the 350 is 21.5″, 700r is 23.375″, 4l60e is 21.875″, and 400 is 24.25″.

Does Turbo 350 transmission have overdrive?

Overdrive. The 700R4 has an overdrive while the TH350 does not. Overdrives allow for high-speed cruising, which saves fuel while lowering torque.

Can a Turbo 350 handle 1000hp?

The TH350 can “hold” 1000 HP but it will be a more maintenance intensive unit that a TH400 or Glide. However, clutches are really not my worry when building a TH350 for that power level.

Is the 350 Turbo transmission good?

A turbo 350 transmission is the perfect transmission for your entry-level sports car, light truck, or rally race. High performance and tough parts give this transmission the ability to handle a variety of use cases.

What vehicle has a turbo 350 transmission?

The Turbo 350 automatic found its way into Chevrolet Camaros, Pontiac Firebirds and Chewy and GMC trucks. Although the transmission most notably matched GM vehicles with small-block V-8s, it also matched the block-block 396 V-8s, V-6s and the small Iron Duke in-line four-cylinder models.

How many splines does a Turbo 400 have?

GM TH400’s primarily used 3 different output shaft lengths, all are 32 spline.

Will a powerglide bolt up to a 350?

Registered. The powerglide should be fine with the 350 unless it is an air cooled version.

What cars did a powerglide come in?

Other cars employing the Powerglide were the 1964 to 1972 Chevelle and Malibu, 1967 to 1972 Camaro, 1962 to 1973 Nova, 1962 to 1967 Corvette, 1970 to 1972 Monte Carlo, 1971 to 1973 Vega, 1964 to 1971 full-size pickups and vans and the 1971 to 1972 El Camino utility coupe pickup.

How do I identify a 350 transmission?

The 350 transmission is easily identified visually, by counting the pan bolts and by locating transmission number. This number contains the year of manufacture, but does not identify the transmission as a THM350.


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