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Rb30/25 with Zd30 gearbox

Chev R
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Chev R Explorer

Chev R

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Good Morning Guys hope you all doing well.

Have not posting in a while been busy getting my build together.

Just a brief I took the rb30 dohc and used that as a build guideline.

Build a Rb30/25 with a series 2 sub.

Stock pistons 86.5mm as the sleeves were oval.

Drilled oil return galleries

1.5mm restrictor

Rods short peened with arp rod bolts

Rb25det oil pump

New water pump

Used my Rb25det head. Ported and flowed with Rb26 valvels, quarters , retainers, solid lifters and original cams cut 270. Just refreshed everything. 

Currently using rb30 gearbox but was grinding a little bit. 

So I opted to get a new gearbox seeing that everything is now being put back together.

I had a call from a guy that imports engine etc. He said he had a Rb25det fat boy box. So I obviously jumped at the opportunity to get the box based on reviews.

Got the box at home now and just checked fitment etc and started seeing some differences. 

My starter does not fit seems to be smaller. So I am worried I would have to change flywheel, clutch etc

The bolt pattern seems to line up with backing plate but not starter bolts

So it seems I would need to change the starter.

Upon some research on google this gearbox seems to be from a Nissan bakkie the zd30 diesels gearbox.

Basically my gripe is should I try and use this gearbox I probably need to change flywheel, starter and pressure plate. I don't like the Idea because i had my complete rotating assembly balanced. And with the covid pandemic not all engineering shops are operating.

What I am after and if I can get your input please guys is?

Has anyone ever used this gearbox or attempted to and what were you findings?

Looks similar to pictures I see of the fatboy box. Also found this code not sure if this is rb though FS5R30A.

Confused as I am doubting my decision as the guy assured.me it is a Rb25det fatboy gearbox and do not want to go through all the hassles as I wanted something straight fit that can  handle more power. My clutch seems to fit though.

I am attaching some pictures for review.

I would really appreciate your input guys as you have been doing this and have the experience.

Thanking you in advance Chev R based in South Africa 

 

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