I have a top loader. The gear is okay to service, if you have the tools.
I can give you an outline:
1. Secure the driven gear and gaskets before starting.
2. Get the car in the air.
3. Disconnet the present speedo and any other items attached to the tailstock like the shifter and linkage.
4. Remove the drive shaft.
5. Place pan under tail stock to catch fluids.
6. Undo and remove the four bolts that hold the tail stock to the tranmission. Remove the bottom right bolt last.
7. Place a jack stand or jack post under the transmission and take the pressure off the tail stock.
8. remove the center bar.
9. remove the tail stock.
10. Check the seal, copper bushing and gasket before you continue.
11. Push the retaining clip in and pull the driven gear.
12. Push the new driven gear into place and make sure the retaining clip is in place.
13. replace as necessary the seal, copper bushing and/or gaskets.
14. reassemble. Should take about an hour ( if you are clean ).
This may look inclusive, but I think I left out a step or three.
Hope this helps!
