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Showing results for tags 'thermostatric bypass'.
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So I went ahead and purchased the "updated" thermostatic valve for my 6L80e, part number 86774933 referenced in the SB. installation look about 10 min and only required a 10mm and 13mm open end. I do my trans fluid and filter every 22,500 as per the service manual and my fluid temp would hover around 185-195 towing or not towing hot outside or cold. As i live in CT the ambient air temp can be 10 degrees or 90. After the installation of the new bypass valve the trans sits at 145 and never got over 150 on a 2 hour 116mile drive. I also think this is much better than the "pill flip" as you retain the bypass ability for colder weather so the trans still gets up to temp quickly. I have not yet towed anything to see if the temp would go back up to the 180-190 range but I figured I would share this info for anyone else who thinks a transmission designed to run at 192 degrees is crazy. Also for anyone who wants one and doesn't wanna pay if your truck is still under warranty the dealer will install one of these if you complain about anything with the transmission even if the "Customer complaint Cannot be replicated." that being said i got mine for $60 on GMpartsDirect.
