A lot of people say that there is no difference between the RS and GSR gearboxes in the CD and CE Evos. Yes, there are small differences in the gear ratios between the Evo 1, 2, & 3 gearboxes, but supposedly there are no differences between the RS and GSR versions.
Most of us early Evo folk know that if you have an Evo 3 gearbox, you need an Evo 3 transfer case as the output drive is slightly different to the Evo 1 and Evo 2 but other than that they are identical.
But are they? Why does Mitsubishi list different model numbers for the RS and GSR gearboxes then?
Brian (bmgtx) and I thought that there might be structural differences between the RS and GSR gearboxes, so I bit the bullet and spent 5 hours comparing the part numbers from the Evo 3 RS gearbox to the Evo 3 GSR gearbox.
I used the Mitsubishi ASA parts programme for this, and I used the VIN from my Evo 3 RS and the VIN from an Evo 3 GSR to do this comparison.
Surprise, surprise, there are multiple differences in the part numbers listed for each gearbox.
Here's a link to a post that I made on another Evo forum:
http://evo123.net/sh...hp?t=712&page=3
As mentioned, if anyone wants a copy of my MS Word doc, I am more than happy to send a copy to them.OK, I have put together a 3 and a bit page MS Word document which fairly comprehensively details all the common parts in Evo 3 GSR and RS gearboxes, and also which parts are different.
Briefly, all selector forks are different, the 5th and reverse rail is different, the centre diff case is different, the diff drive gear is different, the diff gear kit is different, the reverse idler gear is different, one of the diff case bearings is different, the tapered roller bearing in the centre diff case is different, the centre diff gear kit is different, the centre diff spacers are different, the centre diff shaft taper roller bearing is different, the intermediate shaft gear cluster is different, the intermediate shaft 5th gear is different, the intermediate gear taper roller bearing is different, the input shaft 4th gear is different, an input shaft taper roller bearing is different, and the input shaft is different.
When I say different, I mean that Mitsubishi lists separate and unique part numbers for the RS or GSR part.
The Mitsubishi ASA that I used to compile the list is excellent for cross-referencing parts that are common between models. Interestingly, a lot of the RS specific parts are listed as being able to be used in GSR's, but not vice-versa. This tends to suggest that the RS parts are higher specification than the GSR parts and that Mitsubishi think that you shouldn't use lower specification GSR parts in RS gearboxes.
I am willing to e-mail a copy of my MS Word document to anyone who is interested; just PM me and I'll send it to you. Or if one of the admins can host it on this site somehow, that would be good.
Cheers,
Peter D
Cheers,
Peter D
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thanks mate
- there might be a 12 flat left in her yet
