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Re: change transmission instructions
This is for rear wheel drive only front wheel drives require removing axle shat and dropping tie rod end and lower ball joint to get tranny out. If you start this I will give tork setting when I know what you have as it is a lot of work to type this out.
First disconnect the battery, inside the cab pull shifter boot off and remove snap ring to remove shifter, next get a block to go under engine remove drive line bolts and be sure E-brake is set and block the wheels, next put bolts from driveline into the read differential in order so you will be able to find them next disconnect the two starter bolts from the starter and tie starter up as not to allow the starter weight to hang on the wires. Remove two bolts holding slave cylinder on let hang off the side do not lose the shaft out of slave. Next remove the transmission mount bolt out next pull four bolts out of transmission cross member, next remove 5 bolts out of bell housing now get a baggie and a couple of rubber bands and pull drive shaft slide baggie over the transmission tail shaft and put on rubber band on bag to keep from losing fluid move drive shaft out of the way. Next disconnect the Speedo cable and wiring harness the reverse switch is at the top so will have to drop the tranny down to keep from breaking wire. Once you have a gap between the transmission and engine put block under back of engine slide the transmission out let the front drop down then lift up on rear of transmission and slide the cross member out of the way. Next slide tranny out of the way next remove the 6 bolts on the clutch assembly turning each bolt 1 and a ½ turns each till clutch is loose remove the clutch pressure plate and the throw out bearing, remove flywheel take to machine shop and have surfaced, replace the clutch plate pressure plate and the throw out bearing reinstall in reverse if you see any oil leaks replace seals, also replace rear transmission seal now if you don’t it will leak next after it is back together be sure you put new fluid in the transmission and bleed the slave cylinder.
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P0826 means there is an issue with a circuit for the up and down switch, usually due to a disabled manual shifter or TCM placed in Limo-in mode.
The presence of a stored code P0725 means that the powertrain control module (PCM) has detected a circuit malfunction with the engine speed sensor input signal. The engine speed input sensor is sometimes called the transmission input speed sensor and the input speed sensor. This type of code may be caused by a mechanical problem or an electrical problem
you need a better mechanic that traces ALL of the possibilities of each code, not just read the code and trow in a part hoping that it's fixed ~ it can be wiring as well, not just plug in a new part as mentioned on the 2nd trouble code to the vehicle speed sensor
I would suggest you get a cheap shop manual to guide you. The basic procedure is put it up on stands, discon battery, remove transmission (or if 4WD sometimes easier to pull engine) remove old clutch parts, resurface flywheel if needed, install new parts using clutch line up shaft, draw down pressure plate bolts in criss-cross pattern and tighten to specified torque (see, you do need a shop manual) and reassemble all. NOTE: clean flywheel and pressure plate suface with Brake-Clean or similar. Replace pilot bushing and throw out bearing too.
ATSG (Automatic Transmission Service Group ) makes the best manuals IMO.
The typical manual is 80 to 120 pages long and in addition to detailed tear down and assembly instructions will include valuable information such as road test procedures, diagnostic information, oil pressure and range reference charts, wiring and hydraulic diagrams, checkball and thrust washer locations, torque and end play specifications, electronic controls and operations, special tools and updates.
Just an exploded view is not a good idea, as it will not contain what you need to determine serviceability of the hard parts and lack of clearance specifications for the end thrust, bearing races, clutch pack clearances, runout's and many other critical specifications... not to mention the updates and fixes. Might want to think about that.
Operate engine until reaching operating temperature.
Turn OFF engine.
Remove the drain plug.
Drain the transmission fluid into a suitable container.
Install drain plug.
Torque to: 22-29 lb-ft. (29-39 Nm)
Refill fluid to specified level.
Fluid Type Specifications
4 Speed Automatic Transmission - Nissan Matic "D"
5 Speed Automatic Transmission - Nissan Matic "K" NOTE: Using Automatic Transmission fluid other than Genuine Nissan ATF will cause deterioration in driveability and automatic transmission durability, and may damage the automatic transmission, which is not covered by the NISSAN new vehicle limited warranty