5 Pinion Planets..

[rhino]

Difference between a 5 pinion rear planet and 4 pinion. The 5 pinion is definitely an upgrade, but we have had several have a small whine when installed.

You must be registered for see images attach

 

[DGA1]

Is the whine attributed to the way the planetary gears are cut, or have you found the part to be actually defective? GM's planetary is the way to go then?

 

[rhino]

If you get one, make sure its a GM planet. The one's we had whine were from an aftermarket source which is much cheaper but the Chinese just didn't make the grade. If you get one, make sure it's a GM. They are around $125.00.

 

[rhino]

It bout has to be the way the gear is cut, I took two apart and the bearings were good, no pits, everything looked perfect.

 

[DGA1]

Good to know. When I'm ready to rebuild mine I'll definitely be bugging you.

 

[Mike]

Great post.

 

[JollyGreen]

Great info and ammunition when I have mine rebuilt.

 

[bggrnchvy]

It bout has to be the way the gear is cut, I took two apart and the bearings were good, no pits, everything looked perfect.

It can also be a surface finish variation. Too high of an RA value and gears will be noisy.

 

[rhino]

It can also be a surface finish variation. Too high of an RA value and gears will be noisy.

That's a little over this old rednecks head.... What's a RA Value? Anyway to correct that?

 

[MIHELA]

Roughness average. Basically how smooth the surface of the gear is. They use the same value to show surface finish of a cylinder head is.