Sonnax has provided the following guide on critical wear areas and vacuum test locations for the GM 9T series of transmissions. Technicians working on these models should find this guide helpful.
You may find that these transmissions have a late 1-2 and 2-3 shifts along with high TV/line pressure.
The complaint
Before or after repairs, you may find that Chrysler RH and RE series transmissions have a late 1-2 and 2-3 shifts along with high TV/line pressure. OE idle line pressure specification is 55-65 PSI in the drive range.
The cause
The culprit here is mismatched TV plunger, bushing and retainer bracket (See Figures 1, above and 2, below). Figure 3 illustrates the difference in the TV cam shaft length between a TV cable system and a TTVA system.
The lower resistance and higher resistance solenoids are not interchangeable.
When the torque converter housing is bolted to the transmission case in an Allison 1000, the geartrain is locked and will not rotate.
General Motors designed the 6T70/75 transmission fluid pump to be a non-serviceable component.
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Sonnax has introduced a hardened steel center support sleeve for Ford 6R60, 6R75 and 2009–later 6R80 transmissions. According to the company, users can restore proper hydraulic control and prevent future wear in these transmissions caused by the 3-5-R “B” clutch housing sealing rings by machining 2-6 “C” clutch housing bore (center support) and installing this
Sonnax has introduced a new drop-in TCC signal damper piston kit for Ford 10R140 transmissions. The company says users can correct circuit pressure variation in these units by replacing the worn OE damper with this kit (part no. 105740-07K). This kit includes an O-ringed sleeve and no reaming is required. Related Articles – Alto releases
Sonnax highlights its oversized cooler/lube flow control valve kit for Toyota UA/AB transmissions. Sonnax says users can recover hydraulic control and restore cooler/lube performance in Toyota/Lexus UA80E, UA80F, UB80E, UB80F transmissions by reconditioning the bore and installing this kit (part no. 168740-08K). Related Articles – Rostra highlights GM 8L90 speed sensor, harness assembly – TransGo
Sonnax has introduced a drop-in 4-5-6 sleeved accumulator piston kit (part no. 124740-68K). The company says users can recover hydraulic control and renew shift feel and performance in GM 6T70, 6T75, 6T80 (Gen. 2) transmissions by installing this kit. Related Articles – American Powertrain adds GearStar automatic transmissions for Ford, Chevy, Mopar – PRT launches
