4L70E 1st Gear shifting issue
4L70E 1st Gear shifting issue Hello,
Helping a buddy with his 2007 Avalanche with a 5.3L. He has recently developed a 1st gear shifting issue. It will not shift out of 1st gear, under any condition, without letting off of the gas. The other gears shift just fine after the 1-2 shift is made. Reverse works just fine as well. Log file and current tune are attached.
I appreciate any help.
Helping a buddy with his 2007 Avalanche with a 5.3L. He has recently developed a 1st gear shifting issue. It will not shift out of 1st gear, under any condition, without letting off of the gas. The other gears shift just fine after the 1-2 shift is made. Reverse works just fine as well. Log file and current tune are attached.
I appreciate any help.
Last edited by batmanntexas; Dec 12, 2019 at 07:39 PM.
TECH Junkie
Joined: Dec 2012
Posts: 3,618
Likes: 1,328
From: Iowa
It's been up for less than 24 hours.
Relax killer.
Alot of guys that have seen this post are probably not hanging out on their tuning laptop to be able to pull up the log and the tune. I'll take a look when I get home from the shop.
Relax killer.
Alot of guys that have seen this post are probably not hanging out on their tuning laptop to be able to pull up the log and the tune. I'll take a look when I get home from the shop.
TECH Junkie
Joined: Jun 2008
Posts: 3,203
Likes: 1,391
From: Nitro Alley
Sorry I do not read Logs.
Any Diagnostic trouble codes?
Any Freeze-Frame data?
Is this a new problem?
How long ago was the 4L70E transmission swapped into your vehicle?
How many miles are on the transmission?
What happened to the original transmission?
Have you ever serviced the transmission?
Have any transmission services or parts replacements been performed recently?
Any other issues with the vehicle?
Any modifications to the power-train and especially the transmission?
Have you checked the transmission fluid level?
Have you checked the transmission fluid condition?
Have you checked the transmission line pressure?
Is this a new tune?
Have you spoken with the tuner?
Do you have another tune you can try?
Any Diagnostic trouble codes?
Any Freeze-Frame data?
Is this a new problem?
How long ago was the 4L70E transmission swapped into your vehicle?
How many miles are on the transmission?
What happened to the original transmission?
Have you ever serviced the transmission?
Have any transmission services or parts replacements been performed recently?
Any other issues with the vehicle?
Any modifications to the power-train and especially the transmission?
Have you checked the transmission fluid level?
Have you checked the transmission fluid condition?
Have you checked the transmission line pressure?
Is this a new tune?
Have you spoken with the tuner?
Do you have another tune you can try?
sorry i do not read logs.
Any diagnostic trouble codes? No
any freeze-frame data? No
is this a new problem? Yes
how long ago was the 4l70e transmission swapped into your vehicle? Original transmission
how many miles are on the transmission? 120k
what happened to the original transmission? See post #1
have you ever serviced the transmission? Unknown
have any transmission services or parts replacements been performed recently? Not in the last 6 months. Prior to that i have no knowledge.
Any other issues with the vehicle? No
any modifications to the power-train and especially the transmission? Small cam in stock motor (216/223)
have you checked the transmission fluid level? Yes
have you checked the transmission fluid condition? Yes
have you checked the transmission line pressure? With the hpt vcm scanner. No physical gauge.
Is this a new tune? No.
Have you spoken with the tuner? Yes
do you have another tune you can try?
Any diagnostic trouble codes? No
any freeze-frame data? No
is this a new problem? Yes
how long ago was the 4l70e transmission swapped into your vehicle? Original transmission
how many miles are on the transmission? 120k
what happened to the original transmission? See post #1
have you ever serviced the transmission? Unknown
have any transmission services or parts replacements been performed recently? Not in the last 6 months. Prior to that i have no knowledge.
Any other issues with the vehicle? No
any modifications to the power-train and especially the transmission? Small cam in stock motor (216/223)
have you checked the transmission fluid level? Yes
have you checked the transmission fluid condition? Yes
have you checked the transmission line pressure? With the hpt vcm scanner. No physical gauge.
Is this a new tune? No.
Have you spoken with the tuner? Yes
do you have another tune you can try?
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TECH Junkie
Joined: Jun 2008
Posts: 3,203
Likes: 1,391
From: Nitro Alley
120K and no trans service... plus the new problem you have...
Well, I would remove the transmission and have a look inside then. Fix and overhaul the unit... It lasted a long time.
Also... Sorry to be the bearer or bad news... but there are no 2007 Chevy Avalanche vehicles produced with a 4L70E transmission.
Either it was swapped into the vehicle; or someone lied to you. Sorry.
Well, I would remove the transmission and have a look inside then. Fix and overhaul the unit... It lasted a long time.
Also... Sorry to be the bearer or bad news... but there are no 2007 Chevy Avalanche vehicles produced with a 4L70E transmission.
Either it was swapped into the vehicle; or someone lied to you. Sorry.
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Verdad Gallardo 120K and no trans service... plus the new problem you have...
Well, I would remove the transmission and have a look inside then. Fix and overhaul the unit... It lasted a long time.
Also... Sorry to be the bearer or bad news... but there are no 2007 Chevy Avalanche vehicles produced with a 4L70E transmission.
Either it was swapped into the vehicle; or someone lied to you. Sorry.
Well, I would remove the transmission and have a look inside then. Fix and overhaul the unit... It lasted a long time.
Also... Sorry to be the bearer or bad news... but there are no 2007 Chevy Avalanche vehicles produced with a 4L70E transmission.
Either it was swapped into the vehicle; or someone lied to you. Sorry.
Also, to my knowledge, there are no external differences between the 4L60E, 4L65E, and 4L70E. The only difference is internal modifications that GM made over the years to in improve the reliability & performance of the original 4L60E.
I may be wrong about my 4L70E designation, so I'll have to dig into that some more.
