Jasper, Ind.--Jasper Engines & Transmissions is offering the CD4E transmission for 2001-2007 Ford Escape and Mercury Mariner, and 2001-2006 Mazda Tribute sport utility vehicles.
Jasper has incorporated a series of improvements that eliminates the CD4E's common failures and provides for a smoother running transmission.
One of the issues in the CD4E is that the scarf-cut seal rings cross-leak in the forward drum.
"Scarf cut rings require constant pressure to keep the seal in a sealed position," said Dustin Greene, Jasper New Product Development technician.
"In the case of the CD4E, the rear lube circuit is separated from the reverse clutch only by the seal ring,” Greene said. “In all ranges but reverse, it is possible for rear lube pressure to exhaust due to the seal not being seated. Jasper updates these seals to a solid ring to eliminate the issue."
Another issue in the CD4E is the reverse drum, which is prone to bushing journal failure due to the soft-cast material it was made from and the lack of direct lubrication.
"Jasper has redesigned the drum to be more durable," Greene said. "A hardened steel sleeve was added to the drum and cross-drilled holes were added to supply direct lubrication pressure to the bushing journal. To help redirect lube through the cross-drilled holes, a redesigned bushing was developed and installed."
Jasper supplies a stand-alone cooler kit with each CD4E that is sold. The OEM coolers have been found to fail internally, restrict coolant flow, and ultimately result in a failed transmission.
"The addition of a stand-alone cooler kit will prevent any possibility of a ballooned, restricted, or contaminated cooler," Greene said. "Plus, our tests have shown the supplied cooler kit is more efficient at cooling than the OEM design, and reduces transmission temperature by as much as 50 degrees."
To deal with wear issues in the CD4E valve body, Jasper reconditions the pressure regulator valve bore and the bypass control valve bore. Jasper then installs an updated pressure regulator valve and bypass control valve that prevents premature bore wear and restores hydraulic integrity to both areas. Jasper also installs a redesigned converter regulator valve that reduces side loading and prevents lube shutoff in the event of a fail-safe condition.
A Jasper remanufactured CD4E transmission is covered by a three-year/100,000-mile nationwide transferable parts and labor warranty.
