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Re: GMC Truck Transmission question
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Posted by Brokenwrench on February 03, 2005 at 09:54:56 from (69.128.196.191):
In Reply to: Re: GMC Truck Transmission question posted by Allan in NE on February 03, 2005 at 08:29:49:
Not to get nit picky, but the 4L60E has the VD vane pump. The 4L80E has a fixed gear pump w/ a pressure regulator valve in the pump body. What I see alot of, is wear in the pressure regulator sleeve. Causing lower line pressure, especially under lower rpm load (pulling down the highway). Converter or clutches overheat and fluid starts blowing out the vent. If it wasn""t just a cooler line leak, the low line may not affect it until those condititons happen, like two states away pulling a trailer. I own a tranny shop in MN, and if you were my customer, I would have let you make the call to go thru or not. The benefits are good if done right, you have an early 4L80E, so there"s lots of key updates to put in. Molded forward and direct pistons, shift kit (prevent runaway line blowing out OD, and replaces PR sleeve with steel sleeve and valve). If you pull alot, these type of things are great updates. I"d get another opinion.
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