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Old 10-01-2015, 05:45 AM   #1 (permalink)
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Default S40 Final Drive swap

I have an s40 transmission w/3.722 FD and swapped the countershaft and ring gear from a 4.25 tranny. With everything in place I lower the case but it will not sit flush before opening the snap ring. I took the tranny to a local mechanic that works with hondas and he says everything is assembled correctly but it still will not sit flush.

Any help will be appreciated to help sort this out.

I changed the ISB, top of mainshaft bearing, two bearings on top of countershaft and differential bearings.
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Old 10-01-2015, 06:15 AM   #2 (permalink)
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Had a similar issue to this and it was a slider jammed..... could be as simple as that.
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Old 10-01-2015, 06:35 AM   #3 (permalink)
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what do you mean with "slider" a selector?

This is my first time opening a transmission.
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Old 10-01-2015, 07:23 AM   #4 (permalink)
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In my case the 5th gear slider/selector and sinchro jammed, causing the mainshaft forks to out of position enough to keep the casing from closing all the way.
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Old 10-01-2015, 07:48 AM   #5 (permalink)
 
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The case won't sit flush until the snap ring is opened.
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Old 10-01-2015, 08:12 AM   #6 (permalink)
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How big is the gap?

Even with the snap ring expanded over the countershaft bearing, no Honda D, B, or K case will sit exactly flush due to the mainshaft thrust washer.
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Old 10-02-2015, 05:32 AM   #7 (permalink)
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Originally Posted by transzex View Post
How big is the gap?

Even with the snap ring expanded over the countershaft bearing, no Honda D, B, or K case will sit exactly flush due to the mainshaft thrust washer.
It seems there was a syncro ring improperly installed preventing the bearing from fully entering. now the countershaft will not lock in the snap ring by a few milimeters. The mechanic will check the countershaft today. hopefully I will get the tranny today.

Thanks for the responses.
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Old 10-02-2015, 09:12 AM   #8 (permalink)
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5th gear MS assembly got dislodged. To lock in the CS ring, flip over the trans once case is bolted together, gravity will do the work.
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Old 10-05-2015, 11:03 AM   #9 (permalink)
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I've always bumped mine on the ground against a few phone books. Turning them over might not always seats them.
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