Get the Most out of Your Manual Transmission

manual-transmission-pic-1

Few things connect driver and vehicle like a smooth-shifting manual transmission. Although U.S. automakers have steadily moved away from manuals, many enthusiast cars still come with optional manuals. The heavy-duty market is still dominated by manuals, with many of these transmissions being automated.

manual-transmission-schematic

Most modern automobile manual transmissions use synchronizers – conical brass rings attached to each drive gear – to match the rotational speed of the drive and dog gears during shifts. Without synchronizers, these gears would clash as they try to mate.  Transmissions without synchronizers require a shifting technique called double clutching to engage the gears smoothly.

Maximizing Shift Quality

Whether you’re driving a sports car or an over-the-road truck, smooth shifts are important. The lubricant’s viscosity and friction properties play a vital role in shift quality. Viscosity that is too high could prevent shifting the gears until the transmission warms up or result in abnormally high temperatures during operation. Viscosity that is too low could cause the synchronizer and dog gear to engage too quickly, resulting in grinding or hard shifts and abnormal transmission wear. The wrong frictional properties will result in poor shift quality and possibly accelerated synchronizer wear.

Synchromesh Lubrication

Despite their relative simplicity compared to automatic transmissions, manuals require properly engineered lubricants – particularly the synchromesh units – to operate properly. In addition to providing smooth shifts, the lubricant must…

  • Help control gear wear
  • Reduce heat for improved gear efficiency
  • Inhibit corrosion to gear surfaces

Controlling wear isn’t as simple as it sounds. The relative motion between gears squeezes out the oil, meaning the microscopic film of lubricant left behind must be sufficiently resilient to withstand high pressures. Typically, the lubricant cannot contain high levels of anti-wear and extreme-pressure additives because they deteriorate synchromesh materials and disrupt gear engagement.

Manual transmissions may call for motor oil; an automatic transmission fluid; a GL-4 or GL-5 fluid or a fluid formulated for synchromesh units. Motor oils are common manual transmission lubricants in older vehicles, but they generally do not offer adequate protection in modern transmissions.

AMSOIL formulates a complete line of synthetic manual transmission fluids for passenger car/light truck and heavy-duty applications. They are specifically formulated to deliver smooth shifts and long transmission life for their intended applications, helping you get the most out of your vehicle.

Check out these links to some of our most popular products. Many are pleased to find weights which many parts stores no longer carry or OEM’s charge sometimes twice for their brand what AMSOIL sells for.

synchro-of-man-tran

 

 

top dead center valve timing

Why Does My Engine Knock? 3 Possible Explanations. John Baker|Aug 06, 2019 10:56 AM There are a few different reasons your engine might make a knocking, ticking or pinging sound. Let’s break each down and talk about what might be happening. Is it an engine knocking sound, tick or ping? One driver’s knock is another driver’s tick. Or ping. […]

cleaning filter surface

Changing the Oil in your Motorcycle John Baker|Mar 09, 2020 9:20 AM Guest Blog Post by Monica Pretzl Changing oil in your motorcycle is relatively quick and easy. It’s also important; regular oil changes prolong engine life and keep your bike running smoothly all season. We broke down the process into step-by-step directions for both […]

Synthetic Air Tool Oil

Premium Air Tool Protection New Synthetic Air Tool Oil provides smooth operation, reduces wear and extends tool life. Air (pneumatic) tools are commonly used amongst automotive enthusiasts, mechanics and craftsmen. Powered by compressed air, they provide exceptional precision and higher power-to-weight ratios than their conventional power-tool counterparts, making them popular choices for those working with […]

Reposting – Top 3 Single-Track Dirt Bike Trails in the Upper Midwest Kerry Johnson|Aug 24, 2016 2:53 PM   We sat down with dirt bike enthusiast and AMSOIL Mechanical Lab Technician, Ben Grembowski, to learn about his favorite places in Minnesota to ride the trails. With 54 state and grant-in-aid trails to ride in the state, […]