Withstand higher pressures and improve durability in GM 4L80-E, 4L85-E and TH400 transmissions by installing Sonnax heavy duty intermediate clutch backing plates. Both backing plates are compatible with OE and aftermarket cases.
- #34144HD-01, .375″ thick, for ’98-ealier 4L80-E and TH400 transmissions
- #34144HD-02, .275″ thick, for ’99-later 4L80-E and 4L85-E transmissions
For more information, visit: www.sonnax.com
