Quick guide to the modern Automatic Transmission

A manual gearbox is a simple and straight forward affair; each gear has its own cog in the box, a lever shifts them, power ensues. Automatic transmissions are a little more complicated. Rather than specific cogs for each ratio, they use planetary gears much like you find in a winch, with one feeding into the next. By using a series of brakes and clutches, the transmission is able to control what gears are engaged and what the final ratio will be.

The clutch has a complicated alternative too. Up front, a torque converter acts like two fans pointing at each other; although, they pump fluid not air. It lets the engine-side fan spin harder and harder until the transmission-side fan starts turning, which is what provides torque multiplication and what stops the 4WD from stalling when you come to a stop.

At certain speeds the transmission can completely lock up the torque converter, giving you direct drive through the transmission. 

What’s all this got to do with programming?

In the not so long ago “olden days” the automatic transmission controlled all these different operations by pumping transmission fluid through complicated valve bodies that would engage the different clutch packs, giving different gear ratios.

This complicated system has now been replaced with simpler solenoids, all controlled by the “Transmission Computer”.

The Transmission Computer relies on a whole bunch of inputs, with everything from the throttle position, road speed, and temperature and gear selection, all being considered before it will kick up or down a gear. The result is a more intelligent transmission that does what you want, when you want, and one that can be easily modified without even dropping the fluid.

Rick and the team did a fabulous job upgrading my beloved 200 series. I have always loved my vehicle but love it even more now! Rick's professionalism and vast knowledge of the 200 series instilled confidence and trust. I am now a Diesel Performance Tune addict and can't wait for my next mod!

Natalie French

I was asked to contact this business by a third party to try and resolve an issue I had with my car’s suspension. I was somewhat prepared for service that was so-so as I lived on the other side of the country and it was obvious that more than likely I would never cross their doorstep again once I had the problem looked at. That view could not have been further from the truth. Rick fitted me in to initially look at the problem and then spent an hour thoroughly diagnosing what may be the cause. He contacted two separate suppliers, arranged to have the parts delivered ASAP and again fitted me in first thing on the Monday morning to complete the job so I could be on my way. I cannot speak highly enough of this company and it’s staff and it’s approach to customer service. I would have no issue using them for any of the services that they provide and do not hesitate to recommend others to do likewise.

Rick V

When it comes to knowledge and quality workmanship you won't find any better on the GC. We originally took our ranger to these guys to fix something that had been incorrectly installed by another company and no one could correct this. From the first conversation these guys knew their stuff and were honest! And resolved my issue with one visit. We are so lucky we were referred to Diesel Performance Tune and take all our vehicles to these experts now. The staff are great to deal with and are honest good people. Anyone had enough of not getting value with who your using currently don't hesitate give these guys a call!

Jessica Sanders

Very professional outfit. I have a PK Ranger and it is hard to find centres who care about older vehicles these days. Rick, Eddie and the boys treated me like one of their high end Land Cruiser customers. I am mechanically minded and was able to really discuss my issues and findings with the vehicle which did not fall on deaf ears. Not only did they resolve my issues and breathed new life back into my old vehicle, they also repaired smaller less noticeable issues which were very inexpensive now but would have resulted in a lot more costly repairs down the track. These guys will be seeing me again 🙂 Keep up the great work.

Matthew Sonter

The diesel performance team did a great job with my hilux. I have had a reoccurring problem for years with the check engine light, limp mode and the hilux throwing codes that no mechanic was able to diagnose. The team was able to find the hidden broken wire, fix it and tune my hilux. It's been running great ever since. Would highly recommend this business.

Jessy Bloom

Rick, Eddy, and the team did a GVM upgrade on my Landcruiser 200 and were fantastic throughout the process. Thorough and very professional. Would recommend highly.

Joanne Riley

First of all I want to say a big thank you to Eddie and his team, im so impressed on the attention to detail and work they did on my 79 LandCruiser. The staff are very friendly, honest and extremely knowledgeable. Thanks again team and I look forward to getting future upgrades and work done. Regards, Dean from Apollo.

Dean T

Just picked up my turbo diesel iload, being a business owner vehicles off the road cost money, the boys did a professional job, highly informational and job completed in a couple days. Competitive price with excellent workshop and customer service, highly recommended. Thanks

Mark Ansems

What a customer service. So hard to find people willing to help. Just a phone call, I was able to get an information that saved me wasting my money and time. Thank you so much. Super happy with my experience.

Mark Uzuelli

Have just had my 2012 Land Cruiser worked on by the guys at Diesel Performance & Tune. ECU remap, transmission remap, Stocklock transmission lockup, fuel manager 2 micron post filter, catch can, carbon clean, Scan gauge & transmission service. Ray & Eddy are great guys who patiently explained everything and answered all my questions. Car runs with much more power & torque now. Very professional job. Thoroughly recommend Diesel Performance & Tune.

Colin Price

Great service, Had my 4x4 tuned and some work done. Very knowledgeable bunch. Eti was very friendly and knew what he was talking about. Thanks guys for looking after me. I'll definitely be back if I need more work done. 10/10.

David Mackow

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