Most likely speedometer cable
The speedometer on a 1990 Mercury Topaz may not be working due to a faulty speed sensor, a broken speedometer cable, a blown fuse, or a malfunctioning instrument cluster. It is best to have the vehicle inspected by a qualified mechanic to diagnose and fix the issue.
There isn't a transmission capacity the only thing you go by is the amount of gears it has.
I assume you have a cable speedometer. If so, just follow the cable on the firewall in the engine compartment to the transmission. When you take the cable out there is a small gear in there. That's it.
Dexron 3 will do just fine.
Possibly. Look at the model # on each transmission. If they are the same, then they are interchangeable.
Mercury Topaz was created in 1983.
The 1993 Mercury manual transmission linkage will have adjustment nuts on each end of the linkage. Turning the adjustment nuts will move the linkage back in forth.
where is the fuel reset swith for a 1989 mercury topaz
On your 1989 MERCURY TOPAZ, the BACK-UP LIGHT SWITCH is: UNDER HOOD, DRIVER SIDE, LOWER ENGINE AREA, MOUNTED ON TOP OF TRANSMISSION
definitly a part...either the odometer unit itself, a speedometer cable or just the gear that's in the transmission under the cable...I say this as I've never seen a digital speedometer on any topaz or tempo from 1990 a before
The switching is done within the transmission by internal pressure. YOu may just be low on fluid. I have had this happen to my 93 topaz three times (plus a fourth that happened before I got the car). Every time it happened the fluid level was full. The tranny used (ATX) on the topaz has a governor on it. If the governor is not set right it will not shift. I have had to have the governor gear replaced Dec. 2005 because of this. Once you have one problem with the transmission you may have problems the rest of the car's life. I am now on my 4th transmission.