TH350 vs 4L60E: Comparing the Differences

The TH350 was GM’s go to transmission for light duty vehicles for at least 20 years.  Beginning in the early nineties, the 4L60E began to be the go to transmission for GM light duty cars and trucks.  When comparing the TH350 vs the 4L60E, there are many differences. GM made the 4L60/700R4 before the 4L60E. … Read more

GM Transmission Pump Alignment Tool

Most of the longitudinal GM Automatic Transmissions have similar sized pumps.  This makes it nice, because one pump  One GM Pump alignment band is compatible with most GM Automatic Transmissions. A pump alignment tool is simple tool, much like a ring compressor, that makes it possible to align the pump body to the pump body. … Read more

NV3500 Specs + Identification

The purpose of this page is to help you find all the info regarding the NV3500 transmission’s specs and identification in one place.  Within the confines of General Motors transmissions, the NV3500 is known as the M50 transmission.  If you made your way here because you were trying to figure out what this code meant, … Read more

CV Joint Noise + Symptoms

What does a CV joint do anyway?  A CV joint (short for Constant-Velocity joint) transfers power to the wheels exactly like a drive shaft would on a rear wheel drive car.  The rub with a CV joint is that it has to transfer power at MULTIPLE ANGLES. There are two CV joints per axle.  They … Read more

Transmission Fluid Change vs Flush

When a vehicle owner drives into any car maintenance facility, they may or may not know what services they really need to keep their car running smooth and efficiently.  It’s easy to be taken advantage of.  They may need the technician to explain a little bit more about the ins and outs of maintaining their … Read more

Saginaw 4 Speed Identification

The Saginaw four speed transmission is a transmission that was used in a variety of GM cars in the 60’s. They were popular in the Muscle Car era. As a rule of thumb, they were not built to handle the kind of power that a Muncie transmission could handle. So, if you are looking to … Read more

M30 Transmission

The M30 transmission is a variation of the venerable 4L60E transmission, and is manufactured by General Motors.  It has four forward gears, the third of which is a 30% overdrive.  M30 itself is a RPO code.  It stands for: M30:   TRANSMISSION, AUTO 4 SPD, HMD, 4L60E, ELECTRONIC There is a different RPO code for every … Read more

700R4 4×4

The 700R4 is a very popular transmission in 4×4 trucks.  It is both proven and rugged.  They can be found all day long in the salvage yard at a very reasonable price.  If you are looking for one just keep in mind that the factory units are typically going to found in a Silverado or … Read more

Transmission Coolers

Many transmissions have a harder life than the manufacturer had originally intended.  Whether it has found life in a street machine, or it is in a tow truck, a transmission cooler can really help keep a transmission running better for longer.  Transmissions wear out incredibly quickly when the fluid gets over the ideal operating temperature. … Read more