Don’t Get Shook Up
Here is a trouble vehicle – a 1999 Chevrolet 4WD Silverado extended-cab pickup – suffering from a problem whose unique cause was difficult for us to find. The customer’s complaint was that the transmission-to-transfer-case adapter had cracked repeatedly. I don’t know the exact count, but by the time we were blessed with this job I think the count was three broken adapters. Figure 1 is an example of one of the broken adapters that was cracked near the transfer-case mounting bolts.
GM’s 2ML70 Hybrid Two-Mode Transmission
GM’s 2ML70 hybrid transmission (Figure 1) is a four-speed unit with fourth gear being overdrive. Applications include the 2008 Chevrolet Tahoe and GMC Yukon and the 6.0-liter 2009 Cadillac Escalade. It also was used for a short time in the 2009 5.7-liter Chrysler Aspen and Dodge Durango. BMW uses the two-mode 2ML70 in its ActiveHybrid X6, and Mercedes-Benz also uses it.
