Transmission rebuild NLA parts recommendations?

[chaseincats]

Hey gang, now that we got the shifter pin out, I'm putting together my bag-o-parts to reseal this transmission and have everything except for 2 bits which are NLA.

- main shaft nut (right hand threaded one which is a 280z trans only part) - part number 32354-a7400

- reverse switch o-ring size 22x2.5mm - cant find part number

 

Anyone have a source for these or know if they're really necessary?

[zKars]

I really think if your nut threads on just fine, there is no reason to not reuse it. To ensure the staked section ends up in a new spot, make a thin spacer from some brass or thin steel stock.

I’ve got a method of releasing the original stake without harming the metal or breaking it. The nut metal is surprisingly soft. In fact I have been successful twice now by simply undoing the nut WITHOUT doing ANYTHING to remove or push up the staked part of the nut! It just gets pushed up as it engages the threads. That 2 ft long 1-1/2 wrench makes it easy to twist that sucker right off.

Of course you’re all cringing, “how dare you risk buggering up the precious threads on the shaft, you monster!” But in every case so far, there has been 0 effect on the threads. The shaft/thread  metal is about 15 times (professional estimate...) harder than the nut.  Then when I put the nut back on and torque it down, I just re-stake in the same spot. Yes after a couple of these I’m sure the staked area will fatigue and break out. Then do the spacer thing to move the stake location.

Regarding the reverse switch, Every one I’ve ever taken out hasn’t had an oring or copper crush ring, and new ones I’ve purchased don’t come with them, including Nissan ones. Just clean it and the case where it seats and snug it down. If it leaks, use a thin crush aluminum or copper washer crush washer or a dab of gasket maker goo. Don’t add too much thickness or you may cause the switch tip to not contact the shift rod and render it intermittent or inoperable.

Edited February 24, 2020 by zKars

[chaseincats]

32 minutes ago, zKars said:

I really think if your nut threads on just fine, there is no reason to not reuse it. To ensure the staked section ends up in a new spot, make a thin spacer from some brass or thin steel stock.

I’ve got a method of releasing the original stake without harming the metal or breaking it. The nut metal is surprisingly soft. In fact I have been successful twice now by simply undoing the nut WITHOUT doing ANYTHING to remove or push up the staked part of the nut! It just gets pushed up as it engages the threads. That 2 ft long 1-1/2 wrench makes it easy to twist that sucker right off.

Of course you’re all cringing, “how dare you risk buggering up the precious threads on the shaft, you monster!” But in every case so far, there has been 0 effect on the threads. The shaft/thread  metal is about 15 times (professional estimate...) harder than the nut.  Then when I put the nut back on and torque it down, I just re-stake in the same spot. Yes after a couple of these I’m sure the staked area will fatigue and break out. Then do the spacer thing to move the stake location.

Regarding the reverse switch, Every one I’ve ever taken out hasn’t had an oring or copper crush ring, and new ones I’ve purchased don’t come with them, including Nissan ones. Just clean it and the case where it seats and snug it down. If it leaks, use a thin crush aluminum or copper washer crush washer or a dab of gasket maker goo. Don’t add too much thickness or you may cause the switch tip to not contact the shift rod and render it intermittent or inoperable.

Sounds good, thanks for the info I'll keep that in mind when dealing with the nut.

Kind of confused regarding the reverse switch because that tranny rebuild PDF that has been making the rounds (attached) talks about it - but glad it seems to be wrong i guess!

-chase

Tranny_Rebuild_FEB2012.pdf

[EuroDat]

3 hours ago, chaseincats said:

Kind of confused regarding the reverse switch because that tranny rebuild PDF that has been making the rounds (attached) talks about it - but glad it seems to be wrong i guess!

-chase

Tranny_Rebuild_FEB2012.pdf 126.02 kB · 2 downloads

Switch? The document Tranny_Rebuild_FEB2012.pdf refers to an O-ring for the "reverse checking assembly". Is that what you mean? It is a device in the later 5 speed to help prevent hitting reverse when shifting back from 5th to 4th.

The O-ring location is shown in the second page in the Transmission shift control drawing under code 31341F. The reverse checking assembly is code 32180. See also photos.

[chaseincats]

42 minutes ago, EuroDat said:

Switch? The document Tranny_Rebuild_FEB2012.pdf refers to an O-ring for the "reverse checking assembly". Is that what you mean? It is a device in the later 5 speed to help prevent hitting reverse when shifting back from 5th to 4th.

The O-ring location is shown in the second page in the Transmission shift control drawing under code 31341F. The reverse checking assembly is code 32180. See also photos.

Ah, ok gotcha.  I thought the reverse checking assembly was datsun speak for the reverse switch.   Thanks

[Patcon]

Those are great pictures with the part numbers!