4L80E funny shifting. . .hope its not dieing. . . - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 16 (permalink) Old 07-10-2009, 12:29 PM Thread Starter
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4L80E funny shifting. . .hope its not dieing. . .

when my transmission shifts it like it hits Nuetrual for a split second. . .Fluid is full and clean nice red color to it. . .

at wide open throttle it'll shift at 3,750Rpm smooth and solid no issues, but anything in between it Revs up starts to shift jumps 300 rpm then hits next gear.

almost like it slipped ?

I'll do be adding a larger cooler to it soon i will also be doing a fluid n filter change as this time, then another filter change shortly after the cooler swap as its used. . .

Mike

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post #2 of 16 (permalink) Old 07-11-2009, 01:45 AM
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Scan for codes. You may have a bad VSS. It will not set the check engine light. Mine didn't

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post #3 of 16 (permalink) Old 07-11-2009, 02:35 AM Thread Starter
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VSS ? . . .

I have noticed it dose on the shift from D 3rd gear into OD 4th gear. . .

Mike

1953 REO M48 w/w.
1962 GMC C45.
1969 AMC AMX -390.
1971 AMC /Jeep J4K-DRW.
1988 AMC /Jeep Comanche.
1991 Dodge RamCharger.

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B.O.M.B Squad #43

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post #4 of 16 (permalink) Old 07-17-2009, 10:38 PM Thread Starter
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So whats this VSS your talking about ?

Mike

1953 REO M48 w/w.
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1971 AMC /Jeep J4K-DRW.
1988 AMC /Jeep Comanche.
1991 Dodge RamCharger.

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post #5 of 16 (permalink) Old 07-17-2009, 11:33 PM
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Sounds like a torque converter issue, like its locking and unlocking harshly between shifts.

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post #6 of 16 (permalink) Old 07-18-2009, 12:36 AM Thread Starter
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I noticed it mostly when i manually shift from d 3rd in OD 4th after climbing a hill. . .
torque converter lock up that sounds like it !

likes its locked in 3rd but then unlocks as it shift in to 4th then locks right back up. . .

ill be getting on the interstate so i'll flipp it back into OD 4th gear then it dose it once it gets to the 3 to 4 shift. . . the trans don't shift when i move the lever it shifts a while after ward. . .


Mike

1953 REO M48 w/w.
1962 GMC C45.
1969 AMC AMX -390.
1971 AMC /Jeep J4K-DRW.
1988 AMC /Jeep Comanche.
1991 Dodge RamCharger.

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B.O.M.B Squad #43

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post #7 of 16 (permalink) Old 07-19-2009, 03:09 PM
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Vehichle speed sensor. It's on the transfer case. Scan for codes and it will tell you if it's bad. I just replaced mine.

1986 CUCV....M1008 6.2 NV4500 5 spd
Raptor 100 LP. Serp belt conversion. 5 inch redneck master exhaust. DB2831 IP. Dmax fan. Humvee waterpump.

1981 AM General M35A2c

Lee's Auto Ranch In Ellington CT SUCKS !!
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post #8 of 16 (permalink) Old 07-19-2009, 03:10 PM
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Trans will "usually" throw a code if there is a problem. I would start by scanning it.

1986 CUCV....M1008 6.2 NV4500 5 spd
Raptor 100 LP. Serp belt conversion. 5 inch redneck master exhaust. DB2831 IP. Dmax fan. Humvee waterpump.

1981 AM General M35A2c

Lee's Auto Ranch In Ellington CT SUCKS !!
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post #9 of 16 (permalink) Old 07-20-2009, 12:56 PM Thread Starter
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How do i go about scanning it ?

Mike

1953 REO M48 w/w.
1962 GMC C45.
1969 AMC AMX -390.
1971 AMC /Jeep J4K-DRW.
1988 AMC /Jeep Comanche.
1991 Dodge RamCharger.

AMO #9860

B.O.M.B Squad #43

Dually Club #98

Last edited by M123KT-450; 07-20-2009 at 12:59 PM.
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post #10 of 16 (permalink) Old 07-22-2009, 04:30 PM
 
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If the rear output sensor(VSS) or its connection went bad, you would never get out of 1st gear. Good sensor shows around 1350 ohms both directions.I just had a late/hard shift issue because of a so-so connection. Probably not your issue at all if you are feeling it hesitate between gears. How long since a filter check/replace?
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