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WHPuller

8 Pinion Transmission

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How can I tell if the transmission is 4 pinion, 8 pinion or, 10 pinion without opening the case? Is there dead giveaways that it is not the 8 pinion? I have found an 654 with a 3spd trans, along with a c-160 with a 6spd trans. Would either of them be 8 pinion? How to the 4 pinions hold up? I believe the 654 would have the 4 pinion? Are they any good?
 

Thanks!

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P.S. I blew apart 2 10 pinion rearends in one day about a year and a half ago. Didn't know that they were weak, lasted a while actually. But, they eventually broke, so I started doing some creative welding on one, but unfortunately the other one had aluminum end caps on the carrier, so I couldnt weld that one. Looking to have a wheel horse tranny hold together without any creative welding! lol

Edited by WHPuller

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To know if it is 10 pinion, jack BOTH wheel off the ground and slowly turn one wheel.  If the other wheel turns in the SAME direction, it is a 10-pinion differential.  If the other  wheel turns in the OPPOSITE direction, it is either an 8 or 4 pinion gearbox.  Don't know how to distinguish between 4 or 8-pinion short of splitting the case open.

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The only time I have run into a 4 pinion in a 8-speed is if it has 1" axles in the mechanical transmission's.  All the ones with 1-1/8th axles have been 10-pinion or 8-pinion....Now when it comes to the hydro's it's different...Most of the substrands are 10 pinion and I have found the old bevel gear in a few..The eaton 700 is 1-1/8th axle but only 4-pinion the Eaton 1100 is the 8 pinion...

 

Mike

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The eaton 700 is 1-1/8th axle but only 4-pinion the Eaton 1100 is the 8 pinion...

 

Mike

 

I pulled an 8 pinion out of the Eaton 700 that was in a 312-H Mike.  The trans showed no signs of anyone being in there before.

 

Just to note if you use a differential out of an Eaton in a Unidrive trans, you will need to change axles as well.

 

Edited by sorekiwi
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Sorry I am looking to build a second puller and not have to deal with the 10 pinion rear ends. I like the 8spd trans because of the hi/lo so I was wondering if there was any way of telling between a 10 pinion and an 8 pinion without splitting the case? From what I have heard the 10 pinion is limited slip and the 8 pinion is not, so in theory, Dave's plan should work by spinning the wheel?

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Yes...but the key word here is "slowly".  If the 10 pinion is operating correctly, both wheels will spin in the same direction.  Spin slowly.  The 4 or 8 pinion will spin in opposite directions...no matter how slow you turn a tire. :)

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