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Farmall & IHC Tractors Discussion Forum
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Farmall A Differential

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Plant Doc

06-12-2018 09:16:53




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I removed the differential so I could install new bearings on the upper transmission shaft. When I removed the differential I was careful and kept all the shims and bearing carriers in order so the same ones would go back in the same as removed. Now the only way I can get the differential ring gear to mate properly with the pinion gear is to put all the shims on one side and not in same order as removed. This isn't my first ring and pinion job but now I am scratching my head trying to figure why this is not going together in the same order as it came apart?? Any ideas?

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tomtinker

06-13-2018 15:02:40




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 Re: Farmall A Differential in reply to Plant Doc, 06-12-2018 09:16:53  
Some differentials will mount on either side of the pinion shaft, when you do that you have one forward gear and a bunch of reverses.



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Janicholson

06-12-2018 16:29:39




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 Re: Farmall A Differential in reply to Plant Doc, 06-12-2018 09:16:53  
Did you gauge the ring to pinion backlash when you took it apart? if it was running "loose" it should be put back together loose. If the new tans bearing is thicker/thinner (even with the same number), or not seated in its retainer, the pinion will stick out farther, or be sunk deeper in the rear of the trans causing the depth error. Wipe patterns mean less on used gears than wear patterns. They are often real noisy when new. If the rear bearing was rough for a long time, it may be even noisere than it was. Jim

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Plant Doc

06-13-2018 03:54:00




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 Re: Farmall A Differential in reply to Janicholson, 06-12-2018 16:29:39  
Janicholson: Thanks for the reply. I think what you are missing is I only replaced the top shaft bearing and did nothing with the lower shaft that has the pinion pinion gear attached. So why the miss match between the differential ring and pinion is a mystery to me. I am an old hotrod bug and have been into my share of rear setups, but this one is starting to get personal. I think I will take the trans out again and check that bottom shaft just for piece of mind and as you said make sure the pinion gear isn't going deeper into the ring for so reason. Again, thank you.

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