A very common question regarding the iron Turbo 400 transbrake is the location of the checkball. This article will walk you through the proper location and function of the checkball.
This solution only applies to Hipster's Turbo 400 Transbrake (P/N: 22748 or 400BRAKE).
Your Hipster T400 Transbrake will be shipped with the checkball already installed in the valvebody and greased in place, see Figure 1.
DO NOT REMOVE THE CHECKBALL OR SPRING!
Figure 1 - 22748 Shown with Checkball Greased in Place:
Checkball location and size is noted below in Figure 2. The checkball is 5/16" Viton type, as found in E4OD or 4R100 transmissions.
Figure 2 - 22748 Checkball Location:
The checkball sits atop a wedged in place spring, which is vital to the proper function of the checkball. Yes, it is there intentionally. No, it's not a mistake, flaw, or a random piece of scrap.
UNDER NO CIRCUMSTANCES SHOULD THIS SPRING BE REMOVED FROM THE VALVEBODY.
Figure 3 shows the spring in place in the valvebody with the checkball removed. This is merely an illustration of the spring, the checkball is still required for proper function.
Figure 3 - 22748 Checkball Spring Location:
The spring only serves to function as a limit for the checkball. It should be installed exactly as shown. It should not put spring tension on the checkball or restrict the ball in any other way.
Proper spring installation in the casting allows the checkball to float freely in the pocket, as illustrated in Figure 4.
Figure 4 - 22748 Checkball Floating on Spring:
If you need the complete instructions for Hipster's Turbo 400 Transbrake 22748, please see the attached PDF instructions.