Sonnax highlights TH400 heavy and extreme duty input shafts
Input shaft failure is a common problem in GM TH400 transmissions running with added horsepower. Sonnax notes that it offers heavy and extreme duty input shafts compatible with heavy duty forward drum part no. 34554-01 and Smart-Tech drum module no. 34555-01K. Part numbers include: • Heavy Duty Input Shaft 30280-01 • Heavy Duty Input Shaft 30280-02 • Extreme duty Input Shaft 35280-02 • Extreme Duty Input Shaft 27280-02
Easy TH400, 4L80-E reverse servo setup: Craft your own tool
While not as sensitive as some shifting bands, the Reverse band adjustment on a TH400 or 4L80-E transmission is critical, and failure to get it right has tripped up even the best builders. There is nothing worse than getting the transmission installed, putting it in Reverse and then not going anywhere or having no engine
ATI introduces pressure regulator valve, boost valve kit for T400
ATI Performance Products has introduced a new solid pressure regulator valve for GM T400 pumps (part no. 4050120) and a boost valve kit for the T400 (part no. 405136). Both parts are new OEM style replacements and will work with OEM and aftermarket mating parts with no modifications, the company says. The pressure regulator valve
Sonnax highlights intermediate clutch backing plates for GM transmissions
Sonnax highlights its heavy-duty intermediate clutch backing plates for GM 4L80-E, 4L85-E and TH400 transmissions. Both backing plates are compatible with OE and aftermarket cases, the company says. Plates available include:
Alto introduces steel plate for GM transmissions
Alto has introduced a new steel plate for a variety of GM transmissions. Applications covered include the 3L80/TH400, TH375, TH425, TH475, 4L80E and 4L85E for model years 1990 and on. The forward and direct steel plates have 14 teeth and measure .077 in. According to Alto, this updated steel plate has a set of 14
GFX introduces new oil pan lines for various GM transmissions
GFX has introduced a variety of new oil pans for several different General Motors transmissions.
Sonnax releases Smart-Tech drum module for TH400 racing applications
At the recent PRI show in Indianapolis, Sonnax announced the release of its Smart-Tech drum module for racing GM TH400 transmissions. According to Sonnax, this drum module is designed to correct a specific flaw of the TH400: the fact that the direct drum counter rotates, spinning backwards in first gear, brakes to a complete stop
Sonnax introduces Smart-Tech drum module for racing applications
Sonnax has introduced the Smart-Tech drum module (part no. 34555-01K) for the GM TH400. Designed for racing applications, this kit increases wheel HP, improves acceleration and reduces shock on shifts while ramping up durability and safety, the company says. According to Sonnax, the module includes parts to upgrade forward and direct drums plus everything else
Sonnax highlights adjustable rear servo pin kit
Sonnax highlights its adjustable rear servo pin kit (part number 34912-01K), which allows users to replace servo pins in GM TH400 and 1995 and earlier 4L80-E transmissions. OE pins have seven different lengths to allow for adjustment of the Low/Reverse band but are no longer available from GM. This pin kit has an adjustment range
Sonnax introduces Low/Reverse servo pistons for GM TH400, 4L80-E
Sonnax has introduced new Low/Reverse servo pistons for GM applications. According to the company, the new pistons are built for GM TH400 and 4L80-E transmissions, and are made of high-strength, billet aluminum to prevent failure.
