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by Z15 » Oct 27 2012, 12:19pm
Allison Transmission Fluid Leak
By Blog Post on March 1, 2010 11:00 PM| No Comments
During cold weather, a small, red fluid leak may be noticed on some 2001-2010 Silverado and Sierra 2500HD-3500HD series models equipped with the Allison LCT1000 transmission (RPO M74, MW7). The fluid leak may be at the back of the transmission by the vent.
This condition may be caused by fluid being discharged out of the transmission vent during extreme cold weather (approximately -15Â°F or -25Â°C or colder), at which point DEXRONÂ® VI and other conventional transmission fluids become extremely viscous.
When the viscous fluid is circulated into the vent area, it becomes trapped and is not able to drain back to the pan. As the transmission warms up, the expansion of the air inside the transmission can force the trapped fluid out of the vent, leading to small drops of fluid being discharged.
To correct this condition, remove the stock vent assembly and run an external tube (Fig. 2, A) and vent (remove the top of the vent assembly) (Fig. 1) up to the front of the transmission to a mounting bracket. (Fig. 2, B)
by manicmechanic1961 » Oct 27 2012, 12:52pm
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by starspangled6.0 [OP] » Oct 27 2012, 5:12pm
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