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?
Shift it into 2nd...either manually or commanded...and it frees up and works fine.
Dropped pan today...no carnage found...solenoids are clicking when shifts are commanded as well.
Fresh tranny, converter and
motor...currently @ 693/623.
Thanks in advance!
Joined Jun 11, 2008
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26 Posts
Joined Aug 5, 2008
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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
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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
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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.
Only mod I know of was a Transgo 48-MOD that I had requested.
Ran it as a DD with occasional track time for 70k+ miles...only issue I had was not being able to manually put it in 1st due to the 4L60e cable and bracket. I never needed to manually put it in 1st so I never worried about correcting it.
While I had it out for the motor re-build I decided to send the PTC converter in to be refreshed and we couldn't get it off the input
shaft. I sent it to trans shop to get it removed and just had them go thru the tranny with a complete re-build while the converter was at PTC. If I remember correctly, there was an issue with the drive hub on the converter.
Got them both back in the truck along with the new motor and discovered this issue with 1st gear while dyno tuning.
Joined Jun 11, 2008
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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
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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...
is there anything in a standard rebuild that could cause issues if this mod isn't taken into consideration when rebuilding the tranny?
Joined Apr 19, 2008
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3,012 Posts
Have you done a pressure test?
Joined Feb 1, 2013
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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.
is there anything in a standard rebuild that could cause issues if this mod isn't taken into consideration when rebuilding the tranny?
Joined Jun 11, 2008
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26 Posts
Discussion Starter · #11 · Jun 13, 2014 (Edited)
Solenoids checked and seem to be fine.
Valve body checked and seems to be fine.
Truck will not shift out of 2nd automatically at all.
Both SOLUS and efiLive can command 2nd and up...but still not 1st.
No metal in pan.
Joined Jun 11, 2008
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26 Posts
Discussion Starter · #12 · Jun 14, 2014
Sumbeach!!!
Tranny is working now!
Changed out solenoids just to eliminate them completely from the diagnosis ...tranny is shifting perfect now...even in 1st.
Joined Nov 26, 2011
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7,147 Posts
Glad you found the issue!