Hi

Does anyone know where to buy or even if it is possible to buy gears for the 5 speed original 280z box.

I have removed my gearbox in order to replace seals, clutch etc and noticed that there is wear to the reverse gear. I have been trying to buy a new reverse gear from USA but can't find one.

I was told that it may be possible to have it repaired. Is this likely and does anyone know a machine shop that can do it?

Many thanks

 

May be useful?

https://zclub.net/community/index.php?threads/4-speed-gearbox-bits-fuel-tank-prop-shaft.27583/

 

Two boxes for a 280zx,I think two of the ratios are different but can’t remember which ones,people usually go for the later 280zx box as it’s a bit stronger so I reckon reverse is the same

 

I remember discussing this with Mike, RIP, i think he said theres an excessive drop in revs between 2nd and 3rd on the early one.

 

Mr G is right and can you use a gear from a knackered old 240/260 box,might be worth a look,if you don’t have any luck let me know exactly Wot you want as my mate rebuilds boxes although he has retired now he might be able to recommend someone,he done my old 280zx box

 

If the reverse gear is the same as the 4 speed item , there was what's left of a 4 speed on ebay the other day and on here I think ? after it was used for a S14 upgrade

if the gear is ok you could get that and strip out the gear to use in yours

 

Reverse gear cog and counter-gear on the 71B boxes are straight cut (not helical) so are pretty straightforward to Stellite weld and re-shape by hand, but - because it is a reverse gear and gets fairly minimal use - if the damage is only on the tips of the teeth (no synchro on reverse) the sharp bits can be smoothed off, the other teeth ground to match, and the gear saved.

 

Typical reverse gear tip wear on a 71B:

 

It's not too badly worn. I just wanted to sort it if possible before I put it all back in the car.

Once I did go from 5th to 4th on the dual carageway and it hit reverse. It was one time so not sure if it was that as the car is so old. There were some metal filings on the magnetic plug but I have been told that is normal for an old transmission. Rest looks good. No noise from bearings and all gears changed well.

Here are a couple of pics of the reverse gear.

 

There is a drop, but it's not excessive. But if your engine develops a good wide range of torque, 3rd becomes a much more wide ranging use-able gear on the road.