The Turbo-spline shaft allows installation of a Turbo 350/400 converter in your Powerglide. We also offer input shafts that will allow the use of a 17-spline Powerglide converter with the Turbo-350/400 transmission. Installation of the Turbo Shaft requires some minor machining of the stator shaft.
How many splines does a Turbo 400 input shaft have?
32 spline
TH400: The 32 spline Atlas was primarily designed for the GM TH400 transmission with a 32 spline output shaft.
How many splines does a TH350 input shaft have?
27 spline
The TH350, Powerglide, 700R, and 4L60E transmissions are the most common GM transmissions equipped with this 27 spline output. These transmissions have various output shaft stickout lengths depending on the vehicle that the transmission was originally removed from.
How do I identify a Powerglide transmission?
Identifying a Powerglide Transmission Identify early cast-iron Powerglides by locating the word “Powerglide,” stamped on the passenger side of the transmission. Another identification feature is that the cast-iron models have no pan on the bottom of the transmission.
How many splines is on the input shaft of a TH350?
How many splines does a 700R4 transmission have?
Initially, the 700-R4 came with a 27-spline input shaft from 1982-’84. Later production units were equipped with a 30-spline input shaft. Although the later 30-spline version is more desirable, both units can be interchanged if the proper spline-count torque converter is also used.
How do you count splines on a shaft?
To determine the spline size of a component (rack and pinion, steering column, and steering box), measure the outside diameter and count the number of splines. If there is a flat spot on the shaft and some of the splines are missing, count halfway around where there are splines and double that number.
How do you count torque converter splines?
Simply count the grooves/teeth on the middle shaft, it will either have 30 or 27 and that will determine what spline torque converter you will need to mate to your transmission.
What is a turbo spline?
Also known as a turbo spline, this is the same spline used in the Turbo Hydromatic transmissions (TH350 and TH400). The larger diameter shaft paired with an upgrade in material quality gives this new input shaft a lot more backbone.
How does a Powerglide input shaft work?
In OEM applications, a powerglide input shaft has a 17 count spline that engages the torque converter and two sealing rings midway down the shaft to complete the cooling circuit. The shaft also has a number of oiling holes throughout to complete the lubrication and hydraulics.
What size spline do I need for my power steering?
We recommend the powerglide spline (17) input shafts made from quality steel at power levels under 700 horsepower and 600 ft lbs of torque. The first input shaft design upgrades changed this 17 spline design to the 30 spline count.
