Originally Posted by
dan_vector
Make sure the 3 screws are only just touching the bearing. They need to be almost loose to stop binding the bearing.
The new diff gear may not be meshing very well if the pinion is old. It's best to replace the pinion with a new one so that the diff gear and pinion break in together to create a good mesh. I would recommend changing the pinion if the car has run quite a bit. If the car is relatively new then you'll get away running the existing pinion.
You can run the mesh slightly tight and feel some tight spots around the rotation. Run it for an hour and it should free up. If it doesn't you can drop down a shim. If it is super tight from the outset then drop down a shim straight away.
Yup....good asnwer...Had exactly the same thing. The 3 bearing screws only just touching the bearing and the gears with no play in the beginning. I have to open it up now after 4 races and some training to see how they hold up. The feel while yanking the wheels a bit seems to be fine and loose.
w.