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The manual transmission uses a mainshaft that is locked in 4th and gives the 1:1 ratio. The rest of the gears come off the input shaft of transmission to a counter gear cluster then back up to output shaft. Either the input shaft gear or the gear on the counter shaft is stripped. That would cause the only fourth gear drive.
if its look the same then it will work ,dont worry about gear ratios and all the technical stuff so long as the electronic stuff lines up away you go and it dont fit then make it fit
Here's what Chilton has to say on assembling the main shaft. 1.assemble 2nd gear, from rear of main shaft, with hub toward rear. 2.Install 1-2 synchronizer ring , with clutch taper to rear, together with a blocker ring on each side so their keyways line up with the clutch keys. Some units will have a snap ring to go on now or some units will have a 1st gear spacer sleeve to go on. 3. Install 1st gear with hub toward front and 1st gear thrust washer. 4.Press rear main bearing onto shaft being sure to seat it firmly. The diagram shows a piece of 1 and 5/8 ID pipe used to do this. 5. Install correct snap ring in groove on mainshaft behind rear bearing. Max gap between snap ring and rear face of bearing is 0"-.005". 6.Install 3rd gear, hub to front, and synchronizing ring, notches to front. 7. Install 3-4 clutch assembly with taper and hub to front. Make sure keys in hub correspond to notches in 3rd gear synchronizer. 8.Install snap ring on mainshaft with ends of snap ring behind spline teeth. 9.Install rear bearing retainer. Spread snap ring in plate to allow plate to drop around main bearing and press on end of mainshaft until snap ring engages groove on bearing. 10. Install reverse gear with collar to rear. 11. Press speedometer gear drive on mainshaft. From the inside face of the speedometer drive to the inside face of the rear bearing retainer should be 4 and 5/16".
The speeedpmeter sensor is located at the right rear of the transmission (on the side.) It is electronic, but there are two nylon gears inside the transmission, one on the sensor, the other on the mainshaft, if the gear stripps, it will not turn.There is a second sensor on the drivers side near the very back. It is a "Hall effects generator". It works off of magnetic impulses.
The speedometer head it self works off of resistance values which change as the rotatation of the transmission mainshaft rotates faster. This may be something best left up to a pro. You can check under the vehicle to see if anything came unpluggeg, but beyond that, unless you are into electronics and can pull the instrument cluster without busting up things around it, leave the refrigerator repai to the refrigerator repair man.
These have a nylon drive gear in the transmission you need to pull that out and look at the drive gear also look in the trans. and see if the main shaft drive gear is loose on the shaft if the speedo cable is old it may be binding it snakes through the body and has alot of bends
There are synchronizer rings on the mainshaft between the synchro hub and the gears. These rings help in meshing the gears so they don't 'grind' when shifting.
I think whoever rebuilt your transmission needs to fix it. It sounds like the synchronizer rings were left out, or possibly there is not enough allowance for the synchronizers to rotate freely -- the axial 'play' when they build up the gearsets on the mainshaft.
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