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Old 04-09-2014, 07:26 PM   #1
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1994 Winn Vetra Allison tranny issues

This is a good one folks, my old bus has been a good one until now, 101k on the speedo now and I just took a trip up I59 to tenn and the tranny temp light flickered a few times and eventually came on. Long long story short, and a new wiring harness in the tranny later, new fluid and filters I managed to make it back to houston without being left on the road. This is what it amounts to....I can drive almost 300 miles then the tranny gets hot and have to let it cool for about 3 hours, then another 300 I go. Fluid looks and smells perfect and I checked the radiator side of the heat exchanger, but not the tranny fluid side yet. Might do that tommorow... Any ideas on this one.
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Old 04-10-2014, 06:00 AM   #2
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Old 04-10-2014, 07:51 AM   #3
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Quote:
Originally Posted by RageATV View Post
This is a good one folks, my old bus has been a good one until now, 101k on the speedo now and I just took a trip up I59 to tenn and the tranny temp light flickered a few times and eventually came on. Long long story short, and a new wiring harness in the tranny later, new fluid and filters I managed to make it back to houston without being left on the road. This is what it amounts to....I can drive almost 300 miles then the tranny gets hot and have to let it cool for about 3 hours, then another 300 I go. Fluid looks and smells perfect and I checked the radiator side of the heat exchanger, but not the tranny fluid side yet. Might do that tommorow... Any ideas on this one.
The main heat producer in that transmission is the torque converter when unlocked. If it's spending most of its time with the torque converter locked up as it should then your problem must be in the tyranny fluid cooler. Is yours built into one of the radiator end tanks? A drain/flush/fill on the radiator might do the trick. Over about 6 years my coolant had gotten too concentrated and when I changed to coolant out with correct 50/50 strength, my tranny temp dropped about 10-12 degrees. Turns out the concentrated coolant is not as good at heat transfer as 50/50. Maybe the gauge or sending unit is failing and the temp is not actually high.
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