1995 sonoma 4l60e shifting problems
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Joined: Apr 2020
Posts: 1
1995 sonoma 4l60e shifting problems
1995 sonoma 4.3 w/ 4l60e auto trans.
What I have done: Got truck w/ 149,ooo miles drove about 1000 miles over one month then trans blew. I replaced it w/ junkyard trans #1 out of 1994/5 safari van w/ 170000 wiles cost $189 from pick a part. trans work well with some (rare) downshifting issues for around 5000 miles then died!
Replaced it with junkyard trans. #2 all ready pulled from 1998 astro van (off the shelf) for $300 this one worked better shifted strong but also had up & down shifting issues now and then and never downshifted into low at stops unless manual shift. lasted about 2500 miles before reverse gear went south very loud very bad noises in R but drove home and checked it out.
After this would drive fine forward and shift normal 1 & 2 and 2-3 but after 30 seconds 3rd. (Drive) would kick out (feels like neutral) no O/D!
Went to friend's shop and ordered a proper year & model junkyard trans from his trusted supplier in L.A. (Low mile trans. "never had a bad tranny from these guys") special deal $500
This on matches the orig. trans & came w/ torque conv. Installed it and it worked great first time down the street up shift to O/D great! next trip and every test drive since 1st & 2nd only!! shifts to drive (3rd.) and feels like going into neutral and truck slows to speed for 2nd gear down shifts and drives. Put in man. 2nd goes great! Man. shift start in 1 then man. shift to 2nd Great! shift to D or O/d nothing!! Start in O/D shifts 1-2 fine shifts 2-3 nothing!
I have installed new sol. 1-2 & 2-3 changed fluid & filter (twice!) swapped speed sens. from orig. trans. and also replaced TPS, MAF,& ECM.
This truck is making me crazy! I have read every thread on 4l60e trans in this forum without success... Please help!!
What I have done: Got truck w/ 149,ooo miles drove about 1000 miles over one month then trans blew. I replaced it w/ junkyard trans #1 out of 1994/5 safari van w/ 170000 wiles cost $189 from pick a part. trans work well with some (rare) downshifting issues for around 5000 miles then died!
Replaced it with junkyard trans. #2 all ready pulled from 1998 astro van (off the shelf) for $300 this one worked better shifted strong but also had up & down shifting issues now and then and never downshifted into low at stops unless manual shift. lasted about 2500 miles before reverse gear went south very loud very bad noises in R but drove home and checked it out.
After this would drive fine forward and shift normal 1 & 2 and 2-3 but after 30 seconds 3rd. (Drive) would kick out (feels like neutral) no O/D!
Went to friend's shop and ordered a proper year & model junkyard trans from his trusted supplier in L.A. (Low mile trans. "never had a bad tranny from these guys") special deal $500
This on matches the orig. trans & came w/ torque conv. Installed it and it worked great first time down the street up shift to O/D great! next trip and every test drive since 1st & 2nd only!! shifts to drive (3rd.) and feels like going into neutral and truck slows to speed for 2nd gear down shifts and drives. Put in man. 2nd goes great! Man. shift start in 1 then man. shift to 2nd Great! shift to D or O/d nothing!! Start in O/D shifts 1-2 fine shifts 2-3 nothing!
I have installed new sol. 1-2 & 2-3 changed fluid & filter (twice!) swapped speed sens. from orig. trans. and also replaced TPS, MAF,& ECM.
This truck is making me crazy! I have read every thread on 4l60e trans in this forum without success... Please help!!
BF Guru
Joined: Dec 2016
Posts: 5,610
From: Moscow, ID
So, I learned that if the fluid is replaced on an old transmission that has not had its fluid regularly replaced, that it can cause the 3/4 clutch pack to slip. What also can happen is if the truck was used to tow but not kept in 3 instead of using O/D this can also burn up a seal that then ruins the 3/4 clutch pack. (This latter thing is what I did to mine.)
The hypothesis for the first reason is that the new fluid will dissolve some of the material on the clutch plates that have been providing some of the friction to help them work. If the fluid has been replaced with the swap, perhaps the new fluid has caused this slipping.
The hypothesis for the first reason is that the new fluid will dissolve some of the material on the clutch plates that have been providing some of the friction to help them work. If the fluid has been replaced with the swap, perhaps the new fluid has caused this slipping.
New Member
Joined: Sep 2021
Posts: 65
From: Kansas City, Missouri
So, I learned that if the fluid is replaced on an old transmission that has not had its fluid regularly replaced, that it can cause the 3/4 clutch pack to slip. What also can happen is if the truck was used to tow but not kept in 3 instead of using O/D this can also burn up a seal that then ruins the 3/4 clutch pack. (This latter thing is what I did to mine.)
The hypothesis for the first reason is that the new fluid will dissolve some of the material on the clutch plates that have been providing some of the friction to help them work. If the fluid has been replaced with the swap, perhaps the new fluid has caused this slipping.
The hypothesis for the first reason is that the new fluid will dissolve some of the material on the clutch plates that have been providing some of the friction to help them work. If the fluid has been replaced with the swap, perhaps the new fluid has caused this slipping.
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