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Username Post: 4L80E        (Topic#357537)
bobb 
Super Senior Member
Posts: 5464
bobb
Loc: paradise
Reg: 09-05-03
08-05-19 06:29 PM - Post#2772484    

any trans experts out there? I have a 4L80E that only goes into 1st gear manualy. it starts off in 2nd and drives normaly. no codes. swapped the speed sensors but same issue. readout shows 1-2 solenoid off in all gears until manually shifted into 1st.

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 


65_Impala 
Very Senior Member
Posts: 4303

Reg: 12-29-02
08-05-19 07:56 PM - Post#2772497    
    In response to bobb

1-2 solenoid should be on in 1st and on in 4th. If it was stuck off then you'd only have 2nd and 3rd.

Intermediate sprag upside down maybe?



 
Rick_L 
Honored Member
Posts: 27651
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
08-06-19 09:13 AM - Post#2772537    
    In response to bobb

If a 4L80E is like a TH400 in 1st/2nd gear in the D position (and I think it is) - 1st gear reaction torque is taken by the low gear sprag in D position. Additionally, when shifted to manual low, the low/reverse band and the sprag take the reaction torque. So no 1st gear unless manually shifted to low means the low gear sprag isn't working.



 
bobb 
Super Senior Member
Posts: 5464
bobb
Loc: paradise
Reg: 09-05-03
08-06-19 03:30 PM - Post#2772563    
    In response to 65_Impala

My mistake. 1-2 solenoid is on in 4th gear. and when manually shifted to 1st.

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
65_Impala 
Very Senior Member
Posts: 4303

Reg: 12-29-02
08-06-19 06:46 PM - Post#2772577    
    In response to bobb

If the PCM isn't commanding the solenoid then you won't get 1st gear. Figure out why the PCM doesn't want to use 1st gear.



 


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