How many gears does a Turbo 350 have?

Asked By: Montes Garcia Pozo | Last Updated: 13th April, 2020
Category: automotive suv
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Specifications. GM introduced the Turbo 350 to replace the venerable Powerglide two-speed automatics. The Turbo 350 featured gear ratios of 2.52-to-1 for first gear, 1.52-to-1 for second and 1.00-to-1 for third.

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Then, how many gears does a th350 have?

This is an automatic transmission that is longitudinally mounted, making it applicable for rear-wheel drive cars. This transmission is a 3 speed, and no overdrive gear was available. The gear ratios used for this transmission were 2.52 for 1st gear, 1.52 for 2nd gear, and 1.0 for 3rd gear.

One may also ask, are all Turbo 350 transmissions the same? Externally, all the TH350 transmissions look the same; however, internally there are some differences. Depending on the engine size of the car the transmission was removed from, it can have anywhere from 10 to 18 friction discs and 10 to 18 steel clutch plates inside.

Additionally, is a Turbo 400 transmission a 4 speed?

Turbo 400 Transmission (TH400) Specs. The Turbo 400 transmission was a 3 speed automatic transmission developed by General Motors. 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.

How do I know if I have a Turbo 350 transmission?

Measure the transmission case with a tape measure. The Turbo 350 case measures 21 3/4-inches long from the front of the bellhousing to the rear of the case. Do not include the tailshaft housing which bolts to the rear of the case. The Turbo 400 measures 24 3/8-inches long from the belllhousing to the rear of the case.

39 Related Question Answers Found

What's better th350 or th400?

The TH350 uses a mechanical kick down switch, whereas the TH400 uses an electric one. A lot of people claim that he TH350 has less drivetrain loss than the TH400, which means that all things being equal, the TH350 is going to get more power to the rear wheels from an engine with equal power.

Is a 700r4 better than a th350?

TH350 vs 700R4: Biggest differences
Shift control– The TH350 is controlled by engine vacuum and a kick down cable. The 700R4 on the other hand is controlled by a TV cable. The best way to think of the TV cable is as a throttle position sensor. The 700R4 uses an overdrive gear to reduce engine RPM at highway speed.

Are th350 and th400 interchangeable?

They are interchangeable, if you use the 13" converter in a TH350, be sure it clears the case. If you are doing a TH400 deal, use the TH350 converter Be sure the flexplate is drilled for both patterns.

Is a th350 a good transmission?

The TH350 is an automatic shift, three-speed transmission. It is widely considered to be one of the greatest of automatic transmissions ever built.

How much HP can a th350 handle?


The TH350 can easily handle 600 lb/ft when properly built. It doesn't take anything super fancy. I have a couple at 600+ using a stock intermediate roller clutch setup. The int roller clutch setup is the common failure point of a TH350 when making HP, getting aggressive shifts, and burnouts.

How strong is a th350?

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. Both transmissions come with a standard one-year warranty.

How much horsepower can a Turbo 400 transmission 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 does the 60 in 4l60 mean?

4L60E One Piece Case Identification: 93-97
GM changed its naming nomenclature into a universal standard across all of its product line. The 4 stands for 4 speed, L is for Longitudinal (for a rear wheel drive vehicle), and 60 is the torque capacity.

What's better 700r4 or Turbo 400?

The TH400 is much stronger, but it doesn't have overdrive and the first gear is only 2.48:1. The 700R4 has an overdrive gear (0.7:1), and a 3.06:1 first gear, but it's not as strong. So it depends on what your using it for and how much power you have.

Can you daily a th400?


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.

What does 700r4 mean?

The GM 700r4 is a 4-speed automatic transmission with overdrive. It was introduced in the early 1980's, as way to make their V8 powered cars and trucks more efficient.

Does Turbo 400 have overdrive?

ATI's 4L85 Offers Overdrive With Near Turbo 400 Durability. When it comes to a performance-oriented automatic transmission primarily used in modified, vintage streetcars, the Turbo 400 is usually the first unit that comes to mind.

Can you add overdrive to a Turbo 400?

Gear-Splitting is that feature which has made Gear Vendorss so popular. Our Gear Vendors overdrive for Chevrolet GMC are available for automatic transmissions using: TH350 and the Turbo 400. You need an auxiliary overdrive transmission capable of gear splitting behind your transmission.

How strong is a stock th400?

a stock th400 can probably handle 1.5 or 2 times the power of a stock 4l60e if not much more. Those th400's are called monsters for a reason, they can take a LOT of abuse.

How many quarts does a Turbo 400 take?


You can expect to use between 11 and 12 quarts of fluid in the stock version.

How much is a Turbo 400 transmission worth?

However, selling it as a good unit and with a "it will work" or your money back warrantee, it should be worth $150-200. There are many shops that sell a stock rebuilt TH400 for $600.

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. The TH400 is conservatively rated at 450 ft.