rb25 gearbox - change of parts

[hardsteppa]

ahoy team

rebuilding an rb25det gearbox at the moment. No idea what year it's from as bought it off gumtree but appears to be the older type with shonky 3rd-4th insert springs that are known to fail (I found their mashed-up corpses in the drained oil). Got most of the parts i need now but want to replace 3rd gear and the 3rd>4th coupler, however bit of a snag, a stumbling block if you will...the original Nissan part number for these 2 items is long since discontinued and over a week of searching, while some good info found, hasn't given me any clear answers. 

RHDJapan has given me this info for the 3rd gear and coupler>

 

However for both of those new part numbers, i have read that they're not a direct-fit and need a spacer, new syncro hub and possibly other bits to make it work with the older gearboxes. 

Has anyone seen them, used them, or seen and used them, and know if they will work with the older boxes or not...? 

 

 

[BK]

you are going to need essentially the same parts as doing an OS Giken gearset into a pre 97 box.

– 3rd gear synchronizer baulk ring ( 1 x 32604-30P61)
– 4th gear synchronizer baulk ring (1 x 32604-40P61)
– Slider(1 x 32611-AA510)
– Hub Assy(1 x 32605-30P11)
– Energizer inserts(3 x 32609-70L15)
– Energizer insert springs (2 x 32603-30P00)

I'll check but I think that's it, unless you use the above in pre 97 stuff.

[hardsteppa]

thanks for the reply - just got an update from RHDJpn that the part number they gave me -  3rd gear Nissan 32261-12U04  - has been discontinued too, and this time they didn't have an alternate part number. I have been scouring the www over a week now and can't find any online seller that has the older type of 3rd gear, so might have to just put up with the one I have.

[BK]

I should have all the pre 97 stuff that was in good condition that came out of my box when I broke 3rd and build my OS Giken, if that helps. Actually I should have 2 sets of everything (obviously not 3rd main gear, just one)as I just recently had a dog box done too.

[hardsteppa]

thanks for the offer - my 3rd gear's still intact/ok, it's just the dogteeth are a bit rounded, and since i'm rebuilding the box, would have been nice to throw a new one in but i'm about 10 years too late lol.

So the part number for 3rd gear here that is still available for the later series boxes https://www.amayama.com/en/part/nissan/3226112u14 - has anyone seen one of these side by side with the older gears and know what the difference is, eg dimensions, number or angle of teeth, etc?

[hardsteppa]

ok so it would seem the gears have the same amount of teeth, but the difference may be where on the face where the synchro sits. Older type is recessed slightly>>

 

whereas El Nouveau, the modern styler...is a flat face, blyat

 

however this is only from OCD googling in between bouts of Pornhub: not seen them firsthand to compare.

[hardsteppa]

further to this, all parts have arrived some put in some reassembling time on the weekend. 

To note, the 3rd-4th coupler/slider part number 32611-AA51A does not work, and not a suitable replacement on it's own. The slider fits and slides fine across the gears, but will not accept the inserts used on the earlier 3>4 slider, only the newer style. Never mind...

 

on a side note, anyone want to buy a new 3>4 gear coupler.

[hardsteppa]

On 04/09/2019 at 7:22 PM, BK said:

you are going to need essentially the same parts as doing an OS Giken gearset into a pre 97 box.

– 3rd gear synchronizer baulk ring ( 1 x 32604-30P61)
– 4th gear synchronizer baulk ring (1 x 32604-40P61)
– Slider(1 x 32611-AA510)
– Hub Assy(1 x 32605-30P11)
– Energizer inserts(3 x 32609-70L15)
– Energizer insert springs (2 x 32603-30P00)

I'll check but I think that's it, unless you use the above in pre 97 stuff.

you know if that's all it takes, I wouldn't have been far off $$ wise buying that gear outright. Originally I was under the impression it also involved buying a new countershaft and input shaft too.