Is a Turbo 400 a good transmission?
The Bottom Line 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 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.
Are all Turbo 400 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.
Is a Turbo 400 better than a Turbo 350 transmission?
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 much is a Turbo 400 transmission worth?
How much is a TH400 transmission worth?
| This item GM TH400 Turbo 400 Stage 2 4×4 Transmission up to 650HP | GM Turbo 400 Conversion Kit Transmission TH400 Stage 2 Race Up to 650 HP | |
|---|---|---|
| Customer Rating | 5.0 out of 5 stars (3) | (0) |
| Price | $1,699.00 | $2,099.00 |
| Sold By | Patriot Transmission & Performance | Patriot Transmission & Performance |
How hard is it to rebuild a Turbo 400?
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 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.
What is a good highway gear for a TH400 transmission?
TH400 gear multiplication with a 3.08 will net you decent highway mileage at the expense of bottom end acceleration. Whereas a 4.10 rear end will snap your neck with a stout motor in 1st, but you’d be stopping for gas much more often and be taching out at high rpm at highway cruising speeds.
How many gears does a 400 Turbo transmission have?
three-speed
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.