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.
E40D Transmission Swap – Hot Rod Hauler
Check out this E40D transmission swap on this 1973 Ford f350. Read more only at www.customclassictrucks.com, the official website for Custom Classic Trucks...
6L80 vs 6L90: Devil's in the Details
The 6L80 and 6L90 are two of the most popular rear-wheel transmissions from General Motors. So many things have been discussed about these remarkable...
6L80E and 6L90E Transmission Specs and Identification
The 6L80E and the 6L90E are close enough that people mix them up constantly, and different enough that putting the wrong one in a heavy truck is an...
Sports Cars That Are Faster with an Automatic Performance Transmission
Some luxury cars with automatic transmission include the Lexus ISF, BMW M4/M5, Audi S6/S8, and Porsche Panamera, to mention a few. Since there are two...
Ford C4 and C6 Transmissions: What Are the Differences?
Ford's C4 and C6 3 speed automatic transmissions are similar in operational characteristics; however, there are still unique differences between the C4 and...
545RFE Transmission Specs and Schematic
The 545RFE transmission is an electronically controlled unit that was great for its time until it was replaced bu the 65RFE and 66RFE. Read below for...