Joined
Jun 11, 2008 · 26 Posts
Discussion Starter · #1 ·
May 14, 2014 Trans can be manually shifted or commanded via efiLive into 1st gear...but it only binds...loading engine...nothing else. Any assistance would be greatly appreciated. Joined
Aug 5, 2008 · 1,506 Posts
Re: Trans gurus: 1st gear issue on fresh build Type of trans? Joined Jun 11, 2008 · 26 Posts Joined Aug 5, 2008 · 1,506 Posts
What is the history of the transmission and what mods done during the build? It could be several things. The intermediate band could be too tight, clutch pack not enough clearance, issue in the servo, etc. Joined Feb 1, 2013 · 285 Posts
When you say it works fine, if you put it in od and try to drive it what does it do? does it take off with no bind or to not get the bind you must go to manual 2? If it feels like wrong gear starts when in od position and it shifts once, its taking off in third and shifting to fourth, reverse is fine and it ties up only in manual 1, the directs are
applied due to missasembly, cracked aluminum piston, wave broken or just welded together. Joined Jun 11, 2008 · 26 Posts
Discussion Starter · #6 · May 15, 2014 What is the history of the transmission and what mods done during the build? It could be several things. The intermediate band could be too tight, clutch pack not enough clearance, issue in the servo, etc. Picked it up several years ago as a fresh rebuild...to replace the 4L60e originally in the
truck...picked up a PTC converter for i as well.
Joined Jun 11, 2008 · 26 Posts
Discussion Starter · #7 · May 15, 2014 (Edited) When you say it works fine, if you put it in od and try to drive it what does it do? does it take off with no bind or to not get the bind you must go to manual 2? If it feels like wrong gear starts when in od position and it shifts once, its taking off in third and shifting to fourth, reverse is fine and it ties up only in manual 1,
the directs are applied due to misassembly, cracked aluminum piston, wave broken or just welded together. It has gone from shop to tuner and back to shop...and to be honest, I personally have not driven it yet. What I have been told is that when in D on dyno that everything worked fine. Was also told that when just driving around working on driveability tune that it seems to work fine. But when manually placed into 1st or commanded into 1st via efiLive that it binds,
loading engine, and that's all. As soon as he commands 2nd, it unbinds and "works fine". Tuner realized this after WOT tuning and going back to work on start-up tune, I believe. Joined Jun 11, 2008 · 26 Posts
Discussion Starter · #8 · May 15, 2014 If the tranny has had the vac modulator mod since day one w/o issues...which it has...
Joined Apr 19, 2008 · 3,012 Posts
Have you done a pressure test? Joined Feb 1, 2013 · 285 Posts
If the tranny has had the vac modulator mod since day one w/o issues...which it has... I think you should personally drive it to cut out the middle man, because there
really isn't enough info to advise you on yet. Joined Jun 11, 2008 · 26 Posts
Discussion Starter · #11 · Jun 13, 2014 (Edited) Solenoids checked and seem to be fine.
Joined Jun 11, 2008 · 26 Posts
Discussion Starter · #12 · Jun 14, 2014 Sumbeach!!!
Joined Nov 26, 2011 · 7,147 Posts
Glad you found the issue! What causes a 4L80E not to shift?Other things to consider: If you vehicle is in limp mode, the issues can be in the input or output shaft sensor, shift solenoids, and sensor of speed. If the transmission is not shifting automatically, there you might need a new PCM (powetrain control module). Checking wiring might be why things aren't working as well.
Can you run a 4L80E without a computer?However, the 4L80E can be easily converted to a manually shifted valvebody, which eliminates the need for the computer and much of the electronics and wiring. This conversion turns the 4L80E into a great heavy-duty analog overdrive transmission that can be easily swapped into almost any high-horsepower 4x4.
What controls a 4L80E transmission?4L80E Transmission Control with the COMPUSHIFT
The 4L80E needs to have an electronically controlled speed sensor, for the 4L80E transmission controller to work properly. Mechanical speedometer tail-shaft conversions can be used in older vehicles.
What sensors are on a 4L80E?The 4L80E transmission may feature two speed sensors, one for turbine input speed and one for output speed. It uses the Input Speed Sensor to monitor input speeds to compare against engine speed and output Shaft Sensor speed, using this data to adjust shift speeds under instantly detectable conditions.
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4l80e will not shift out of 1st gear
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