When warm 4 speed automatic will not engage in third or overdrive
My 1995 safari awd does not engage in third or overdrive . The problem seemed to happen quite suddenly. Low and second seem to be ok. The temp. outside at the time was around -28 cellcious. The trans to my knowledge has never been rebuilt but has been well taken care of.
Re: when warm 4 speed automatic will not engage in third...
This may or may not help, but here goes. Those transmissions tend to have a problem with the valve body seperator plate going bad. what it is, is the plate is a bit too soft and it has these check balls (looks like sling shot balls), that open and close. what might be happeneing, is when the tranny is cold the ball is small enough to let tranny fluid thru, but when it warms up the check ball increases in size, enough to lodge in the plate (since the hole in the plate has been enlarged due to the ball pounding it out), thus not letting tranny fluid enguage the correct upshift solenoid. Every tranny i have opened up has had the plate holes pounded out, and i've seen a few where the ball lodged it self in the hole.
Now i'm not sure if the check balls are for the shifting solenoids or not, but it could be. another thing is that there is a shitch or computer inside the transmission bolted to the valve body. when you take the pan off you can see it (i think you have to remove the filter, but i can't remember). anyway try replacing it first. i would just rebuild it tho. its not too hard, but you just have to be clean, and keep trac of the hundreds of little parts and how they go. there is some guy on ebay selling the rebuild kits, and step-by-step videos on how to rebuild specific trannys. he has one for the safari (all years). thats what i used when i rebuilt my tranny on my 95 safari. good luck
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? 13:19 https://www.youtube.com/watch?v=JpmJtuVrdWk
Mar 16, 2011 - Uploaded by Nick Stageberg
How To Rebuild A 4L60E Automatic Transmission ... Also here is a link to some common break/fixes that may require a rebuild:... GMC canyon, envoy, safari savana, sierra Sonoma, Yukon, ....Great video, my 96 sierra 4x4 when shifting into high gear motor races as if nothing is there........................always ...
Mar 18, 2011 - The 4L60-E is an automatic shift, four-speed overdrive, longitudinally...... 4l60e 2002 gmc 4x4 was not driven for 1 year,will not shift into 3rd or ... I have a 2005 GMC envoy 4x4 6 Cylinder I assume it is a 460LE Transmission.
I have never known an overdrive that cannot be switched on or off at will or engaged or disengaged.
There are two definitions of overdrive and in the philosophy of some people the fifth gear is an overdrive.
The conventional manual gearbox, because the first motion shaft is locked to the third motion shaft in the top gear ratio, any supplemental ratio that has a ratio higher than 1:1 is considered an overdrive ratio.
The more traditional definition of an overdrive is a supplementary gearbox that can be incorporated into a normal manual gearbox to provide a single overdrive ratio for the purpose of quieter and more economical cruising.
The early overdrive was cable operated by a large chrome-plated dashboard-mounted handle. Later overdrives were hydraulic units that could be switched in or out by electricity, often by the means of a steering column-mounted switch or by a tiny switch incorporated into the gearknob.
A typical installation included an inhibitor switch mounted on the gearbox which prevented overdrive operation in the lower ratios when the benefits would be dubious.
Sometimes a lower than standard final drive ratio would be used and the overdrive ratios which typically could be selected whenever third or fourth gear was selected could be used together to produce something like a six speed close ratio gearbox which was hitherto unheard of when some of the rest of the world was still using "three on the tree" type three-speed gearboxes.
Most manufacturers had dispensed with overdrives by the end of the 1970's due to the weight and added expense, in favour of the now common five-speed gearbox, though Nissan incorporated an overdrive ratio into their automatic transmissions to compensate for torque converter slip when fuel costs began to rise disproportionately.
If you have an overdrive unit fitted to your car that doesn't work, I advise starting the diagnostic process by checking through the electric circuitry, wiring, switches and solenoid.
It should be either a 4R70w or E4OD, check the trans code on the drivers door decal and compare it to this list.
Transmission codes from 1995 Manual
M = manual 5 speed overdrive (Mazda?)
E = Automatic E40D
G = C6 auto
U = 4R70W (4spd auto with overdrive)
C = manual 5 speed close ratio (Z-F)
W = 5 speed H.D. Overdrive Transmission codes start with "TR" then are followed by one of the letters above.