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4 to 5 lug swap on s30

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This is saved for my own referance.


The 5-lug swap is quite easy, the most difficult part will be getting the

caliper-disk spacing correct. I have done this swap on several 510's and it

works really well.


Get the front hubs and rotors off an 84-89 300ZX Turbo, or an 86-89

non-turbo 300ZX. Remove the hubs and rotors off of your 280ZX struts and

slide the 300ZX hub onto the spindle. You will note that the spacing for the

rotor does not match the caliper. You will need to make or fabricate a

spacer to match the difference between the rotor and where the caliper

mounts to the strut. Another way to do this is to seperate the disk from the

rotor and make a spacer that fits between the hub and rotor.


This is also an excellent opportunity to upgrade to a better front brake

caliper. The 300ZX disks are 11" diameter and vented-- even bigger than your

280ZX disks. One swap that I saw that worked really well was the use of

Toyota four-piston truck calipers on the 300ZX disks. The Toyota calipers

are very common and easy to find. They are however, very heavy as they are

made from iron.


Another brake caliper to use is the one off of the 86+ Mazda Turbo II's.

This is an all-aluminum, four piston caliper, and can be found quite easily.

The RX-7 caliper is very light, and there are plenty of performance pads to

be found for them. This is the setup that I am using on my 510. You will

have to build a spacer to use these calipers (but you have to do that

anyway) and you will need to match the RX-7's caliper bolt pattern (easy to do).


** note from Ross: these pads are ~4x3", a huge pad by any standards!**


The rear disks are easy to convert to five-lug. I am using 280ZX rear

trailing arms so I have direct experience with this part of the project.

First remove the four-lug disk, caliper, and stub axle from the control arm.

You will need a large impact wrench to remove the stub axle, they have a

single, very large nut that requires an impact to remove it. Slide the stub

axle out of the control arm and use a press to remove three of the four

studs. Since the four lug pattern is 4x4.5, and the 5-lug pattern is 5x4.5,

one of the studs is in the correct place. I had a spare 5-lug disk that I

used as my pattern. Slide the disk over the remaining stud and center the

disk onto the stub axle. Once you are sure that the disk is centered, mark

the other four holes. Use a drill press to drill the holes just barely

larger than the new studs that you are going to install. You want the studs

to just fit through the hole. Using the press again, press the other four

studs splined ends into the stub axle. One of the studs will be close to the

edge of the stub axle because of the 5-lug pattern. We determined there is

enough material to support it, but if you are concerned you can easily add

more material.


You can redrill your rear disks for a 5-lug pattern, which would be nice

because then your rear caliper would work, or use the 300ZX turbo rear disks

and calipers, but they are a larger diameter so you will need to make a new

caliper mount.

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I have an 86T I am using for a donor front and rear, so most of what you had concerning the rear and  re drilling I can avoid, with what I currently have on hand it looks like a pretty direct swap with just the spacers being a concern, but really that part seems easy. Thanks for the writeup, Ill post some notes and pictures after I do the swap, luckily the 86T had some nice tires on the stock rims, which to me look pretty nice ! I was hoping maybe I could use the axels too, the 86 has nice boots on the CV's maybe a stronger part than the zx's had. I do have the r200 out of the 86 obviously, is it possible the two can just be swapped directly differntial wise is there any bolt pattern issues ?

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