6.5 turbo no overdrive 4L80
#1
6.5 turbo no overdrive 4L80
Took my truck to the transmission shop cuz it would not shift into od they said the tcm was bad 400.00 later and 3 miles and it quit shifting again. found loose battery cable on pass side fixed that everything worked great for about 3 weeks. I can unplug and blow out the tcm it will shift great as long as you drive like granny. first time you get on it shifts real hard and i lose od please help
#4
my whole system was low. batteries were barely charging. I'd check it at the batteries. I never did fix it all the way so I can't tell you for sure what it might be i did my motor swap before I fixed that electrical problem. but its an actual function of the ECM to disable overdrive on low voltage.
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waitwaitwait you have a 92?
I didn't notice but I just read up a bit and it looks like it works about the same so since that was one of your problems I would run with it.
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waitwaitwait you have a 92?
I didn't notice but I just read up a bit and it looks like it works about the same so since that was one of your problems I would run with it.
Last edited by FastCR; 05-04-2009 at 08:28 PM. Reason: Automerged Doublepost
#5
Check your Throttle Position Sensor (TPS) plug on the side of your fuel injection pump for loose connection and if it seems tight and clean put some dielectric grease on it. I had that same problem and it would go for weeks and then just quit having OD, put dielectric grease on it and went no problems ever again.
#7
check your pedal tps as well they tend to go bad as well and the won't shift, i had that problem before i did my swap in my truck
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you also might want to check your speed sensors in the input side of your trans and the output on the tailshaft of the trans and if it is 4x4 check the output speed sensor on your transfer case. i had 2 sensors go bad on mine. they would read onetime and act up once in a while. the sensors are cheap from napa, but i noticed the gm ones are better.
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you also might want to check your speed sensors in the input side of your trans and the output on the tailshaft of the trans and if it is 4x4 check the output speed sensor on your transfer case. i had 2 sensors go bad on mine. they would read onetime and act up once in a while. the sensors are cheap from napa, but i noticed the gm ones are better.
Last edited by chevycummins1@yahoo.com; 05-05-2009 at 03:12 PM. Reason: Automerged Doublepost
#8
i tried the grease it didnt work it worked for bout 6 miles i turned around then stopped shifting
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i live in ohio so i doubt you will come here..it would be nice but thats a haul..and yea its a 1992..
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i live in ohio so i doubt you will come here..it would be nice but thats a haul..and yea its a 1992..
Last edited by 6.5 smoker; 05-06-2009 at 02:05 PM. Reason: Automerged Doublepost
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