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Old January 16th, 2022, 15:45
XJ-Mayhem XJ-Mayhem is offline
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Join Date: May 2009
Location: San Jose, CA
Posts: 154
NP231 SYE Issues

Iíve looked this over and messed with it for way too long, either Iím missing something stupid or Iím unaware of some additional steps.

1990 NP231 from behind an auto
G2 Gear SYE part # 37-231SYE (fits 87-01)

Iím running into two issues

1. Main shaft seems to sit too deep into the planetary side roller bearing. The upper larger shift fork in its highest position is still grabbing the synchro. Meaning the shaft is never in neutral. With the chain on it also binds/rubs on the larger shift fork collar slider piece. Iíve flipped it both ways, chain wonít fit period one way and rubs the other way.
Grabbing the main shaft and pulling up (towards rear axle) about 1/4Ē allows for neutral spinning and the chain to stop binding.
Was there some sort of button at the end that I lost or something? Or is a c-clip supposed to be holding it in a different position?

2. Shift fork shaft is too long with the new G2 housing. The new G2 housing wonít get anywhere near sitting in the correct spot. Pics are without the second case half but notice where the riding surface is on the shaft for the tail housing bearing - nowhere close. Itís sitting on the splines in the pic.

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Old January 16th, 2022, 17:08
Tim_MN's Avatar
Tim_MN Tim_MN is offline
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Join Date: Mar 2003
Location: Minneapolis, MN
Posts: 7,573
Re: NP231 SYE Issues

I have not installed an early 231 SYE, but I do know that with some brands of SYE the mode fork rod might need to be trimmed. I also think I remember reading that the output yoke installation influences the location of the shaft in the housing.

I would do a thorough job of research before any cutting.

Here are the directions from JB Conversions.
Step #11 reads:

11) Verify the length of your mode fork shift rod as shown (Fig.11). If your shift rod measures 10.2", it will need to be cut down to a length of 9.380".

Originally Posted by bimmerjeeper

Go ahead and slam the liftgate down on a blanket, and see how long you are laughing.

Last edited by Tim_MN; January 16th, 2022 at 17:18.
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