Just Rebuilt 4L60E, has no Overdrive... Help!!!
05-24-2010, 12:16 AM
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Car: 1990 Firebird
Engine: 6.0L LQ4
Transmission: 4L60E 4000 Stall
Axle/Gears: 3.23 G80 (01 TA)
Just Rebuilt 4L60E, has no Overdrive... Help!!!
I just rebuilt my 4L60E transmission to handle the power of my engine. I have it installed and have 1,2,3 and reverse but I have no overdrive.
I didn't have TCC as well but its because I didn't properly wire it up. I have no DTC's when I use HP tuners.
What could cause me to lose 4th gear only?
I didn't have TCC as well but its because I didn't properly wire it up. I have no DTC's when I use HP tuners.
What could cause me to lose 4th gear only?
12-28-2010, 07:22 PM
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Re: Just Rebuilt 4L60E, has no Overdrive... Help!!!
I have the same problem. I stopped at Advanced to have the codes checked and he said it was one of the throttle position sensors. I checked my ATSG manual and it lists the TPS as a possible cause as well as the fluid pressure switch assy, brake pedal switch and the 2-4 band assy assembled improperly. I'm going to try the TPS first. I realize this is an old post, did you figure out the cause in your case? If so, what was it? Maybe you can help me... Thanks in advance.
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