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Founded in 1978, Sonnax is a diversified supplier of specialized drivetrain products to the automotive and commercial vehicle industries, and to industrial sectors utilizing drivetrain technology. We design, manufacture, test and distribute a wide variety of components used to remanufacture torque converters, to rebuild automatic transmissions, and to protect driveshafts and associated components from over-torque damage. Sonnax became a 100% employee-owned company in 2010.
As a leading supplier to the automotive aftermarket, Sonnax exports to more than 70 countries and supports emerging markets worldwide. An international network of distributors, remanufacturers and technical resources is one result of our commitment to successful partnerships with our customers. The Sonnax TASC Force™ is vital to this effort, bringing the Sonnax team together with transmission specialists, remanufacturers and rebuilders to share knowledge benefitting the entire transmission industry.
Sonnax corporate headquarters in southern Vermont includes state-of-the-art design, inspection, technical development and distribution facilities, with additional Technical Development Centers located in California, Georgia, Illinois and Wisconsin. Our 150 plus employees take great pride in the Sonnax name, and strive to further the company's reputation for excellent service, technical knowledge and customer dedication.
Sonnax Industries is an ISO 9001: 2008 Registered Company
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1996 Saturn sl2 automatic will back up when cold but not when it is hot all forward gears are fine what would cause this?
The most likely culprit is the Transmission Valve Body. The reverse valve wears out the aluminum housing and when warmed up, causes the fluid to flow around it instead of pushing it. If you can rev the engine up and get it to go into reverse then that is most likely it. There is an aftermarket company called Sonnax that makes repair kits for transmissions but don't look to put the kit in yourself. The kit can be had for $19.95 but the special reaming tool is around $500.00. Look for a rebuilt valve body with the Sonnax kit and install it. They can be had on eBay for as little as $175.00. Installation is relatively easy for someone with the know how and the tools. It took me less than an hour to do mine. One caveat: read the directions that come with it! There are steps that need to be taken to reprogram the car's on board computer system. If you skip these steps, you will think that the rebuilt valve body is badly defective as the transmission will not want to go into gear and when it does, will shift very harshly. The computer has to learn the new valve body's hydraulic requirements and you have to initiate this process.
What does problem code p0741 mean on a 2003 Cadillac deville?
This code relates to the torque convertor clutch control system, similar to the P1870 code found in other GM models. The usual problem here is slipping in the torque convertor's viscous clutch and possibly a solenoid problem. The most common repair would be to remove the transmission and replace the electronic pressure control solenoid (EPC), the torque convertor clutch solenoid (TCC), and replace the torque convertor to an aftermarket upgraded unit the eliminates the viscous clutch (available from several suppliers that install the upgraded "Sonnax" brand convertor parts). This would also be the time to replace the internal filter inside the side cover (only accessible when the transmission is removed from the car) and both scavenger filters in the lower pan. It is usually not necessary to dismantle the transmission past removing the side cover. Re-install the transmission, re-scan and clear codes. NOTE: This installation is not for a novice mechanic, the Cadillac is a very labour intensive "remove & replace" on the transmission and requires special tools and training.
Why does 1995 Astro van shift hard?
AnswerGM has a service bulletin regarding harsh upshifts from 1st to 2nd gear on Astro Vans (and similar GM vehicles). They say the problem typically occurs for vehicles with greater than 32 thousand miles on them. They recommend installing a control valve body with the revised TCC regulator and isolator valves. I just had this done to my 1999 Astro and it solved the problem.Alternatively, Sonnax manufactures kits which correct the problems on the TCC Reg. & Isolator valves. If a transmission shop finds the control valve body to be the fault of your problems, discuss this option with them as it will be significantly less expensive than a total replacement of the control valve body.However, before assuming a worst case scenario with your transmission, always be sure to check the transmission fluid levels. If possible, drop the pan, drain the fluid, replace the filter and fluid. If this doesn't alleviate the problem, then it would be prudent to take the vehicle to a reputable transmission shop to have it professionally diagnosed.*Note: The service bulletin was only regarding '97 and later models, as they seem to be plagued by this issue. It is possible, however, that this defect is also present in earlier models.
If your 1997 Olds Bravada 'hard shifts' from first to second after ANY highway use what could this be?
thats ur transmisson, my friends jeep does it too. try some of the stuff they carry at the auto store. if that doesnt work, its expensive to fix My '97 Bravada had a new tranny put in after it did this... (Fortunately mine was still under warranty) This is a known issue with GM vehicles that have the 4L60E transmission. The issue normally presents itself after the transmission has had time to warm up and has been driven approximately 50 - 60 MPH. At highway speeds the torque convertor locks up for increased efficiency and so that it generates less heat. The lockup is accomplished by a solenoid in the tranmission's valve body which applies the torque convertor clutch (TCC). The solenoid and valve body itself are made of different metals which cause them to expand and contract at different rates. This constant variance in rates causes the valve body to wear away. The wore valve body allows transmission fluid to slip past the solenoid, causing a weak TCC apply. This weak apply is detected by the tranmssion as a slip. When a slip is detected the computer increases the line pressure to the shift solenoids to make the shifts firmer to minimize damage. This increased line pressure is what causes the hard shift that you feel, it is most noticable from 1st to 2nd gear. If the transmission detects the slip on two consecutive trips it will illuminate the "Check Engine" or "Service Engine Soon" light and store the code P1870. If you ignore the problem, you will end up damaging your transmission and it will require a rebuild or replacement. However, if you catch it in time you can generally save your transmission. There are two ways to remedy the problem. 1) Replace the valve body. (GM has a new updated one) 2) Repair your current valve body, this can be done with special repair kit available through Sonnax.
