Built to Hold
Build guides, transmission tech, and install notes from the Gearstar shop floor. Every unit we ship is assembled by one builder, matched to your combo, and dyno-tested before it goes out the door. This is where we show the work: what holds, what grenades, and how to spec it right the first time.
Overview of the 4L85E Transmission
The 4L85E transmission is a series of an automatic transmission from General Motors. It is also popular since it is a heavy-duty transmission that was...
Shifting Into Overdrive With Performance Automatic
Many transmissions in the past may have been designed without an overdrive, but this is not the case with modern transmissions. The reason is because of...
Overview of the 4L80E Transmission
The 4L80E transmission was produced in October 1963 by General motors for longitudinal engine configurations. This transmission is a revamped version of...
Torque Converter Problems: Symptoms & Replacement Costs
It may be a bit challenging to ascertain if the problems with your car are originating from its torque converter or transmission. As such, mistaking the...
The 4L80E Built With the Latest and Greatest Parts
The 4L80E may be an old transmission from General Motors, but it has been revamped with the latest and greatest modern parts to boost its performance. As...
Was Your Transmission Rebuild Dyno Tested?
Whether your transmission rebuild is working perfectly today, or it is already giving you problems, great thought has to be given to its dyno-testing because...