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[Torviki] Fitting An R31 Skyline Bw78 Differential To Lh/x/uc

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#1 enderwigginau


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Posted 27 August 2008 - 08:25 PM

 Article title: Fitting an R31 Skyline BW78 differential to LH/X/UC
Article description: by rorym
Category: General LH-LX-UC
Date added: Aug 27 2008, 08:25 PM
Article starter: enderwigginau

This is article shows how and why to convert a Borg Warner 78 Diff from a Nissan Skyline R31
to replace the standard LH/X Banjo and the UC small Salsbury.

OK..Here goes...The reason to do it..These are a set of axles from a banjo (left) and the B/W (right).

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Get a diff housing from a R31 Skyline. The R31 manuals were all 28 spline same diff as VL Turbo Commodore. Pintara is ok as well if using a spool but they only have 25 spline axles.

Have a diff place cut off the old Nissan mounts and fit the Torana pickup points.

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The Nissan diff is about 10mm wider each side but you pick that up with the discs which bring it back into line at the same length,remove the 3mm backing plates/dust covers behind the rotors will help. Redrill the rotors to your stud pattern, mine are HQ and when the wheels bolt on they hold the rotors.

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Now we look like this.
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Makes sure you get all the handbrake cables and brackets when you buy the diff. They have 2 strainer points/brackets you need to pull towards the front of the car, drill holes and bolt them to the floor as per the pic. You will also need to bend the floor bracket at the front to the shape of the floor after you have pulled the cables and bolted their tensioner plates in..

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Using a UC floor mount handbrake, cut 2 slots in the floor and open it up to pass the connector through.

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I used a stainless steel adjusting knuckle for a boat I found at a chandlory. I connected it to the UC end then onto the cable bracket puller through the floor. Adjust up...Done.
I cut a piece of car tube and pop rivetted it to the floor to stop and dirt/water etc coming into the cabin.
The front bracket bent to the shape of the floor clears the tailshaft by heaps. Being auto adjust once you have tension, you just pull on the handbrake 6 times to adjust up the pads to the rotors. Be aware to get the shocks off, because the mounts are close you will have to drop the calipers. Fit the shocks up to the housing before fitting the calipers and rotors. Thats about the only minus in the whole deal.

  Caliper/shock mount.

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Strainer brackets

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Floor /cable adjuster.

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Fitting an R31 Skyline BW78 differential to LH/X/UC

#2 parsons5000


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Posted 09 October 2013 - 07:16 AM

Hi is this diff for sale now saw it on eBay today

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Posted 13 October 2014 - 07:30 PM

already copied this conversion so maybe a bit late to ask these questions.


the hub that locates and supports the wheel on the axle flanges is smaller than the hole in the rims.   does this mean its no good. isn't that what support the load of the wheels.


also i think the mounts have been put on  wrong.  the diff points down.  i have adjustable upper mounts i could wind out longer to tilt it up but if i have to wind them out a long way will this make them more likely to bind.

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