Sonnax 6L80/90 Torque Converter Heavy-Duty Builds Explained 

Especially across the big 3 domestics, the overcharged customer is the new R&D testbed.

So glad to hear that, thanks so much for the wonderful feedback!

Our product support team would be happy to help you. They can be reached directly via email at sonnaxtechsupport@sonnax.com, or phone at (800) 843-2600 ext. 398. Thanks for reaching out!

Glad to hear it! Thanks so much for your support, and let us know how everything goes.

@@sonnax will do!! I also pre ordered my 4L60e gm054-HD valve body 6months ago through summit and it’s expected to ship 1-7-24. I’ve been anticipating it’s delivery

Thank you for your comment, and hello to you, too!

No, that'll cost GM an extra $3.24 per vehicle! Nevermind that the cost of vehicles keeps rising thousands of dollars year over year.

No, as we are not transmission rebuilders. We design and manufacture top-of-the-line parts for transmissions, torque converters, and drivelines. Feel free to visit our website to learn more: www.sonnax.com. You can see what's available for the A960E here: www.sonnax.com/units/25-a960e. Hope that helps. Thanks for reaching out, and have a great day!

Our product support team would be happy to help you. They can be reached directly via email at sonnaxtechsupport@sonnax.com, or phone at (800) 843-2600 ext. 398. Thanks for reaching out!

NO! I don't care what they believe. Keeping the stock allowed slip BS is just making life harder on the Sonnax upgraded converter. EVERY good builder will block the appropriate ports to force TCC to not unlock or slip. Its better if it goes in walks up unlocks locks up unlocks. And also a good practice on these transmissions is we go in and program out the lock up on first through fourth and only lock up in 5th and 6th on daily driver trucks and fourth fifth and sixth on towing vehicles. Because this slippage that GM put in there is to make sure you don't feel that torque converter lock up but that's also what makes that front cover grind down to metal and overheat and warp that front sheet metal cover and if they had built a billet style front cover for the converters they can get away with it maybe but in all actuality you're going to be much happier if you find a good person who knows how to tune a 6L 80 or a 6l90 and eliminate that slippage apply pressure just a little bit to make sure it's a good solid hold without overloading anything. And if they're really good they'll go in and tune your shift points so that your transmission gives you a nice firm but not radical shift where you feel one two three four five six and it holds better and doesn't burn itself up.

No, we do not. We design and manufacture top-of-the-line parts for torque converters, transmissions, and drivelines. Feel free to visit our website to learn more: www.sonnax.com/. Thanks for reaching out, and have a great day!

Our product support team would be happy to help you. They can be reached directly via email at sonnaxtechsupport@sonnax.com, or phone at (800) 843-2600 ext. 398. Thanks for reaching out!

We don't offer complete torque converters, we design and manufacture top-of-the-line parts for them. Feel free to reach out to our product support team with any questions. They can be reached directly via email at sonnaxtechsupport@sonnax.com, or phone at (800) 843-2600 ext. 398. Thanks for reaching out!

​@@sonnax that's a mistake... Just saying.

Our product support team would be happy to help you. They can be reached directly via email at sonnaxtechsupport@sonnax.com, or phone at (800) 843-2600 ext. 398. Thanks for reaching out!

The converter kits and modifications in the video only work for 6L80 and 6L90 units. The 300mm converters in the 4L60E’s don’t suffer from the same converter failures that the 300mm units see in the 6L units. For your 4L60E application, a converter builder should be able to set you up with a low stall 300mm TMBX style converter with a forged cover. The Sonnax part number for a forged cover for a TMBX converter is GM-CC-17: www.sonnax.com/parts/4589-front-cover. Hope this helps, and thanks for reaching out!

@@sonnax Thank you so much for replying to my question, The LS1 4l60e in question is out of a 2004 Australian Holden Commodore and fitted to a 94 Toyota Hilux LN106 using an adapter kit mating the 4l60e to the Toyota transfer case, The Hilux is setup with a Touring Canopy and loaded up for extended living in the outback and weighs in at around 2400kg / 5300lb travelling in some very hot and rugged conditions that puts a lot of stress on the transmission and converter so a recoed one is on the list to be done. Cheers from downunder.

Glad to hear that! Our product support team would be happy to help you. They can be reached directly via email at sonnaxtechsupport@sonnax.com, or phone at (800) 843-2600 ext. 398. Thank you!