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

 

 

Oil Analysis Kits Available from Oil Analyzers Inc. Ed Newman|May 10, 2022 2:38 PM   In order to provide a cost-effective oil analysis option when a full fluid analysis is not required, Oil Analyzers Inc. has launched a new Oil Analyzers Value Kit that focuses on the most critical used-oil analysis tests. It provides less […]

Racer Secrets: Tips and Tricks to Help on Race Day Lindsay Premo|Oct 16, 2020 8:00 AM Happy October, race fans! There are a lot of things we know are necessary in racing. A helmet, driver’s suit, gloves, appropriate footwear and (obviously) something to race on/in are all essential to striving toward that checkered flag. But, […]

First Time Heading to Sturgis? We’ve Got Some Tips. Jamie Jarvi|Aug 03, 2016 9:26 AM The Sturgis Motorcycle Rally is a true bucket-list destination for any motorcycle enthusiast. Each year thousands upon thousands of riders descend on Sturgis, S.D., and turn this small, sleepy town into a motorcycle mecca. Some travel the road to Sturgis […]

AMSOIL synthetic motor oil helps you breathe easier Oxygen is great in your lungs, but it’s not so great in your motor oil. Matt Erickson | VP, PRODUCT DEVELOPMENT Oxygen comprises about 20% of our atmosphere. It’s the third most common element in the universe. Without it we’d all be doomed. Yet, oxygen can cause […]

How to Maximize Marine Engine Performance and Reliability John Baker|May 02, 2022 10:36 AM   Fishing opener is right around the corner for us Northlanders. It’s essentially a regional holiday, rivaled only by the opener of gun deer season in the fall. Although some boaters and anglers don’t realize it, using a dedicated marine motor […]

Zeroturn Spindle

Best Practices for Your Zero-Turn Mower First, we’ll start with a question. How did we survive before Zero-Turn mowers? What did they do in the 50’s? Did they not cut the grass? Chris Sharon|Sep 07, 2022 8:00 AM Here at AMSOIL, we’re always investigating ways we can help you get the most out of your […]