Is a late RD28 gearbox compatible with an early RB30

[mudnut]

After having to change out a gearbox and having trouble with the second box, I am looking at selling my two boxes.(one would be partially rebuilt) and putting a stronger unit in.

As an RD28 is basically a re-engineered RB30 block, the box should fit. I was wondering if the the GU's had an upgraded box fitted to handle the higher horsepower. The Ratios would be slightly different too, wouldn't they?

[mudnut]

"Nobody knows the trouble I've seen. Nobody cares." - Princess Vespa (Daphne Zuniga) Space balls.

Bump.

[Alitis007]

Not sure between rd28 and rb30 but I would be looking at putting a gearbox from an r33 skyline with a rb25, that would be far superior to the rd's or mx5 and even the rb30 turbo mx7 gearbox and will bolt up to the back of the 30 no dramas.

[nissannewby]

Rb25 will bolt to the gearbox of the rd28. Plenty of high hp rb30/25s running the rb30/rd28 gearbox with out an issue.

As for compatibility the earlier box could be slightly different I know the 4.2 boxes are very similar but in the gu the gear stick is in a different location. Whether the top can just be swapped over I don't know but I would imagine the 2.8 would be similar.

[mudnut]

Thanks blokes. I must have struck another brummy box. I am still waiting for a mate to have a look at the original unit. I've read that there isn't much you can do internally to upgrade them either.