For more than 30 years, racers have relied on a variety of OEM parts to complete their cars due to budget or due to a lack of suitable aftermarket parts. In the last 15 years, this has started to change dramatically with the availability of aftermarket cases, housings, gears, and just about every other high performance transmission component.
Stock cases have a lot of applications in budget and entry level racing.
What are the practical limits for the stock cases? What are some important tips to remember when using a stock case?
StigO recommends using a polyurethane transmission mount. Solid, rigid mounts are often too stiff for a powerglide case when a car launches hard. This will often lead to a crack in the case.
Also, stock cases are more prone to failure if driveshaft get out of balance or u-joint thats not properly configured or faulty.
Finally, it is important to monitor line pressure when using a stock powerglide case. Pressures over 250 lbs can cause leaks or cause cracks to form in the thin die cast aluminum found in some of the various casting versions.
We have customers racing with a stock case up to and above1500 HP whitout any problems , but not every stock case can handle that kind of power.
Aftermarket powerglide cases bring a lot of advantages over stock cores:
Revised oil channels optimized for racing
Improved wall thickness to meet SFI safety requirements
Elimination of non essential areas and features for OEM usage