If someone know which bearing Tracy use on prop shaft if yes
 what brand,ball or roller and
  bearing number



  Jean Prudhomme

  I don't have it here but I think it is a 1.3875" ID and
  the OD is 3.350". It is .75 inches wide. Double sealed.
  Inch series. Probably a Chevy Pick up truck rear wheel bearing.

  Search the internet for ball bearing makers and give
  them the dimensions.

  Paul Lamar


 Do you know if is a roller trust bearing or ball trust bearing??

 When you have a chance could you send me the bearing number and brand

 Jean Prudhomme


 It is a ball bearing Jean. The Chevy Truck has a lot of
 side load on the rear wheel while cornering so it must be
 a combination of axial and radial load.

 I am getting ready to go to Germany
 so I may not get out to the hanger for a couple of weeks.
 Try to find it on your own. Start with an auto parts store.
 Just measure the bearing they bring out and if the dimensions
 are correct that is the right one.

 Ball bearings are ball bearings.

 Paul Lamar


Paul
Your statement that ball bearings are ball bearings.
"It aint necessarily so".
It's over 40 years since as a design engineer I designed bearing systems but
if my memory serves me well there are deep groove ball bearings that have
greater axial load carrying capabilities than the standard type. If this
particular bearings is required to take high axial loads then I would be
surprised if it wasn't a deep groove type. Care needs to be taken in
selecting the correct bearing for this application
Bob Izett -Perth, WA

Well yes that is true and I totally agree but any rear axle bearing
THAT size will work. Tracy's prop shaft is an actual section of a GM rear
axle. The side loads on the rear axle are similar to the thrust loads on
a prop shaft. In fact the retainer for the ball bearing is the same
way GM retains the rear axle ball bearing. Namely it is pressed on.

Tracy has sold well over 100 gear boxes with many of
them flying for the past 10 years so it must be OK.

There is nothing seriously wrong with it but it could be designed
to be as strong yet lighter in weight. The bearing itself is very
heavy being over 3 pounds as I recall.

I should have said a rear axle ball bearing is a rear axle ball bearing.


Paul Lamar