I have a 1992 ford ranger xlt with a 3.0 liter engine. and a A4LD automatic trans. If I place the trans in overdrive from a stop the trans feels like it wants to go but will not. If I place it in drive I have perfectly operating trans. Once over 50 m.p.h. i can then shift the tranny into overdrive and it will engage the overdrive gear. once I come to a stop i have to place it back into the drive position to go again. Any ideas??????
Sounds like the shift kit is warn out in the transmission. The overdrive line may not be able to provide enough hydrolic pressure to engage the gears to move the truck. When you switch to regualr drive, that line is able to build the hydrolic pressure to engage the gears. At a certian speed (for the transmission, certian hydrolic pressure) there is enough pressure to engage the gears in overdrive, but go below that, and you have to start in drive again. If this is the case, there is no easy fix for that and I recomend taking it to a transmission shop to have your shift kit examined. Opening up an automatic transmission requires specalized tools, clean shop enviroment, and knowlage more then the average back yard machanic has.
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Your truck has a A4LD transmission. The older ones had major problems. What i believe is happening with yours is the converter is locking up intermittently. 1st-4th are actual gears for 5th(overdrive) the converter locks. I had the same problem as well as did alot of people I spoke with. I solved it by getting a used A4LD out of a '92 ranger with a 3.0L motor (these transmissions had some upgrades to deal with a number of problems including the one you are talking about.) You will need to swap bell-housings (this requires the pump to be shimmed properly,I paid a shop $100 to install the pump ,with is attached to the back of the bell-housing) There are only 2 kinds of A4LD one for floor shift and 1 for column shift,make sure you get the right one.Good luck.
There are 5 automatic transmissions used in the Ford Ranger, Explorer and Mountaineer. They may be identified by checking the transmission code on the Safety Standard Certification Label attached to the driver's side door post, in the space marked Trans. The transmissions can also be identified by a tag attached to the lower left hand extension attaching bolt. The transmission codes are as follows:
1991–94 code T is for the A4LD transmission
1995–99 code T is for the 4R44E (2.3L, 2.5L & 3.0L) or 4R55E (4.0L) transmission
1996–99 code U is for the 4R70W (5.0L) transmission
1997–99 code D is for the 5R55E (5-speed automatic) transmission
So, what you need to do now is...establish from a FORD workshop, whether both the A4LD and 4R55E transmissions share the same components and mounting dimensions.
Check your operator's manual. Make sure any and all fuses that have anything to do with the affected items are not blown and are working properly. If you can; check for loose fuse connections or wires. Hope this helps. God bless!