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

 

 

Leave a Reply

06Sep 2019
Motorcycle shock cutaway demonstrating the use of fluid.

Fork Oil – Which do I use? John Baker|Aug 22, 2019 10:33 AM A fork oil’s number-one task is to deliver consistency. Consistent dampening despite temperature changes. Consistent rebounds despite different terrain. Consistent performance so you can ride or drive confidently. Consistency. What fluid would provide the best shock consistency? Water. Yes, water. But you […]

05Sep 2019
synchromesh unit

Get the Most out of Your Manual Transmission 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. Most modern automobile manual […]

05Sep 2019
Amsoil signature series motor oils

Signature Series – Packaging What You Should Expect Signature Series Synthetic Motor Oil is not only the best oil we have ever made, it’s better than any competitive oil we have tested. Advanced engine technology and the normal demands of everyday life generate extreme conditions that can challenge motor oil and engine life. Signature Series […]

05Sep 2019
Become a AMSOIL dealer

DIRECT JOBBERS: ‘WE’RE A WELL-OILED TEAM’ Direct Jobbers Ken and Denise Chuderewicz of Pittsburgh are a self-described “well-oiled team.” “When we started our AMSOIL business we never gave it a second thought – we are a team,” Ken said. “We have always enjoyed doing things together. We support each other in everything we do. We […]

05Sep 2019

AMSOIL’s My Garage for your Records John Baker|May 12, 2016 1:00 PM   The garage. Protector of vehicles, incubator of great ideas. Many innovative companies owe their beginnings to the humble garage. Apple, Harley-Davidson and Google, to name a few. It makes sense. The house is where we make sensible decisions, do our taxes and […]

05Sep 2019
amsoil girls with a fan

Where in the World is Team AMSOIL? Lindsay Premo|Jan 15, 2018 10:40 AM (Posting archives we missed) Sometimes things get a little hectic around here, race fans. January is one of the busiest times in the AMSOIL Race and Events Department. Last week was the kickoff of Monster Energy Supercross and AMSOIL Arenacross. And with AMSOIL Championship Snocross in full swing, […]