fbekholden.com

Bought this Borg Warner 5 speed box a year or so ago to put into a mates EK sedan - he wants to keep the grey but fit a 5 speed box behind it which I think is a great idea but I don’t want to chop the floor in my ute up………

Figured was gonna need an adapter plate so got them both on the bench to nut out how to do it



Started by tracing an outline of the stock box -





Then overlaid the new box over that



Ended up with this - plan is to convert this drawing into a DXF file then have it laser cut out of 10mm plate and mill 10mm off the bottom half of the 5 speed bellhousing- none of the bolt holes clash so should be able to bolt this adapter to the gearbox , use stock engine mounts and clutch slave etc.


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Blacky wrote: Wed Dec 31, 2025 12:26 pm … and mill 10mm off the bottom half of the 5 speed bellhousing- none of the bolt holes clash so should be able to bolt this adapter to the gearbox , use stock engine mounts and clutch slave

Clever bugger

Cheers,
Harv

Sweet as. I’m in your camp on the floor mod. Five speed with original grey and rear end would be perfect.


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A bloke over here fitted a Holden Shuttle 5 speed and column to an EK van - gives you a 5 speed column shifted box - but try finding a Holden Shuttle nowadays …..

Try Lawrence at Speeds Spares in Mitchell, ACT. My radiator cowl came from a wrecked Shuttle in his vast collection.

Brett027 wrote: Wed Dec 31, 2025 7:32 pm Try Lawrence at Speeds Spares in Mitchell, ACT. My radiator cowl came from a wrecked Shuttle in his vast collection.

Worth a try cheers mate

What about the starter ? I assume it will be a late one ?

Greg

Blacky wrote: Thu Jan 01, 2026 10:46 am

Brett027 wrote: Wed Dec 31, 2025 7:32 pm Try Lawrence at Speeds Spares in Mitchell, ACT. My radiator cowl came from a wrecked Shuttle in his vast collection.

Worth a try cheers mate

0262411516
He used to wreck hundreds of holdens a year and has a huge shed of bits. Summernats peeps have a pilgrimage there every January.

Saves me looking it up cheers again mate

how will this save you from cutting up the floor hump?

Mick wrote: Thu Jan 01, 2026 10:39 pm how will this save you from cutting up the floor hump?

It won't Mick, this is for a mates car - I would like to do it to my ute but I don't want to cut the floor

EK283 wrote: Thu Jan 01, 2026 11:21 am What about the starter ? I assume it will be a late one ?

The top half of the bellhousing is identical barring the third hole for the grey motor starter motor - will use the grey starter as it has the correct pinion gear for the grey flywheel.

Blacky wrote: Thu Jan 01, 2026 11:34 pm

Mick wrote: Thu Jan 01, 2026 10:39 pm how will this save you from cutting up the floor hump?

It won't Mick, this is for a mates car - I would like to do it to my ute but I don't want to cut the floor

ah ok i thought that somehow you'd found a box that fit in the original hump