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What the heck is a pilot bushing (bearing)?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by fortcollinsram, Apr 6, 2002.

  1. fortcollinsram

    fortcollinsram 1/2 ton status

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    What is it? I know what the throw-out bearing (or release bearing) is but what is a pilot bearing...what does it do...how do I know if I need one? Thanks in advance...

    Chris
     
  2. thatK30guy

    thatK30guy 1 ton status Premium Member

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    It's the little bearing that sits in the "hole" on the back of the crankshaft. It allows the manual tranny shaft to "sit" and "spin" while using the bearing as a "guide" to keep it in place.

    Without this bearing, you can expect tranny shaft failure due to wobbling and no support.
     
  3. 72THING

    72THING 1/2 ton status

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    I ran a 350 out of an automatic truck (that had no pilot bushing) in my truck with SM465 for a while. I didn't know any better when I put the engine in. My most recent motor swap was from an automatic and I put a pilot bushing in it. I can't believe I didn't tear up my transmission in my old motor without the pilot bushing.

    Will
     

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