About to install my q45 rear and z32 axle

[csramotorsports]

I know someone suggested that I would need the J30 bushing kit to get this job done in the write up on the q45 diff swap here on the site. But every install writeup I see using the J30 rear diff no one mentions anything about having to add a bushing kit to get the job done. And other sources say it's just a bolt on affair. Can someone help me out on this so I don't go wasting money on something that I wont really need.

[compactfean]

You can rather fill the holes with quick steel and then drill it out, get the bushing kit or swap all the guts to your stock r200 housing. If you go the quick steel route you will need 2 tubes of it and really large fender washers and use stock bolts.

[csramotorsports]

Which holes are you talking about? The two that mount by the input flange? You got any pics of it?

[compactfean]

Look at my thread from a while back about j30 diff bolts. There's pics in that thread. And yeah its the 2 mounting bolts by the pinion gear.

[csramotorsports]

The search function on this site sucks, but I think I got it now. But also, I could just re-use whatever bushings are currently on my q45 subframe setup right?

[compactfean]

I don't think the q45 subframe will work...just swap the rear end,axles and hubs.

[csramotorsports]

I know I meant just reuse the bushings...but I guess there the same as the subframe rubber bushings and can't really be re-used right?? I understand what you mean now with the quicksteel thing and drill them out...Would this potentially have any negatives??

Oh and did u ever find ur axle? I found one locally luckily this guy I know that runs a shop had a complete rear end that a customer left behind. I still had to pay for it, $180.

[compactfean]

Thats a pretty good price for that axle...I've only found one online for 230 plus shipping (can't complain, race axles are way expensive and this setup is stronger) for the tt axle. Im not sure what your getting at with the subframe bushings ...completely different than your differential bushings. The diff bushings must be completely knocked out and rather filled or replaced with solids. I have everything I need for the swap except for the axle.(even put achiba studs in the tt hubs) the reason you don't want the stock diff bushings is because the rubber will flex and crack the rear cover....not to mention if you don't have the bolts that came with the diff you wont find them! Trust me I tried going that route and just ended up filling mine for the j30 I have in there now. Im gonna run my shimmed j30 with my launch control this season but when I get my drag slicks im gonna do the q45 swap with the j30 ring and pinion and solid subframe bushings.

[csramotorsports]

Ya luckily I got the entire subframe for the q45 hub to hub so I have all those bolts. I think I'll try the quick steel method...any negatives to that? How come your using the j30 ring and pinion for the q45 swap? Better gear ratio? I'm mating my SR to a z33 so I think the short ratio transmission combined with the 3.55 diff and a helluva powerful sr20 should be fun.

[compactfean]

Yeah for your setup the stock q45 gears I think would be tits with that trans. I plan on running the z32 trans so the j30 3.916 gears should be nice, not to mention the j30 housing is longer for the speed sensor and I already have a shorter one piece driveshaft aluminum so in order to keep my driveshaft I will have to use the j30 housing with q45 guts.

[2FAS240]

i'm about to do my Q45 swap next week hopefully i just got my z32 tt axle for 120$ from my contact in Puerto Rico should be here saturday since you 2 seem pretty knowledgable on this subject just wondering if i'm missing anything... this is going in a 95 240sx se

i have: Q45 Diff, Q45 Drivers side Axle, Q45 Hubs, SPL Solid diff bushings, and the 300zx tt drivers side axle am i missing anything??? i sure hope the diff i get tomorrow has the bolts with it if they are that hard to find!

[csramotorsports]

Ur contact in puerto Rico? U mean car-part.com lol? Jk but uh, sounds like ur straight, I haven't figured out if the handbrake setup fits right up I will soon though

[2FAS240]

yes lol thats where i found it but i actually do have some contacts there lol one so of them went and picked it up yesterday and another friend is bringing it back here with him on saturday so i don't have to pay for any shipping which is nice they tried jacking up the price to 150 when he went and it picked it up though that didn't fly though!

i was just i PR 2 weeks ago and hit up there ZLegends Nissan Meet and a few of there gathering spots i was surprised how big of a car scene they have down there

i actually have 2 diffs for this setup i bought the 97 - 01 diff first before i realized it had a 5 bolt pattern so i got 90 - 96 diff now to...

ya i am a little sure on the e-brake to i guess i will find out soon to...

[2FAS240]

do you know on the 90 to 96 if it matters if the carrier has traction control? or do you need the the carrier without it ??

[csramotorsports]

I'm not sure but TCS is just a sensor shouldn't be an issue either way. Not sure on that but I couldn't think y it would matter

[compactfean]

Yes the ebrake will work ...the z32 ebrake and q45 ebrake are the same part number so pretty much all you will need to do is a "z32 rear brake swap" you'll rather need 2+2 300zx cables or change the location of the e-brake cable brackets you have now. When I did my 300zx brake upgrade I just said screw it and went hydro ebrake. If you go the quicksteel route for those rubber bushings you just use the stock 240sx front diff bolts. That's why I went the quick Steel route because I didn't have the long bolts for the diff that are supposed to come with it. But you don't want those rubber bushings anyways.

[2FAS240]

thanks ya i didn't know if the diff was longer or not do to the TCS...

i know the e-brake cables were cut on the Q45 hubs that i got from the junk yard i've never messed with e-brake systems to much i guess what i'm asking is when you do the rear brake upgrade those cables get replaced correct?

[compactfean]

For your 5bolt diff you could get some j30 axles and sell that as a package.oh, and if you shim your diff I wouldn't get the big shim that Nissan has.....it makes reassembling a pita.

[csramotorsports]

The input flange may be different for TCS. I'm doin custom driveshaft so it never bothered me to research it

[compactfean]

Yeah you'll have to replace them. The e-brake setup is pretty much just like any drum brake setup....just cable driven, not hydrolic. The only reason you would need the q45 ebrake is if you are switching to q45 calipers and rotors. If your not switching than get your stock rotors drilled to 5lug.

[2FAS240]

thanks for the idea i forgot that the J30's were 5 bolt i might just pick them up and keep that set up around incase i ever break this one and have a hard time getting another z32 tt axle!

ya the input flange is different it has a wider 4 bolt pattern than the KA driveshaft looks like most people just mark off the new bolt pattern and drill a second set of holes... the flange is beefy enough to handle the extra set.

[csramotorsports]

I kno I was talking about TCS differences

[2FAS240]

gotcha

[csramotorsports]

Hey guys, so the 350z transmission has a final drive of 3.53, and the diff 3.55...would you think I would be better off with a 4.08 ring and pinion? Anyone know if it's even swappable from the NA 300zx diff???

[compactfean]

Yes many people have swapped the stock ring and pinion (240 also has 4.08 gears so why use na z32?) But with the z33 trans would be a ridiculous burn out king! You wont be able to hold any gear for any length of time and will be at like 4500 rpm at 65mph...I think. I'd have to have all the ratios and plug them in to a MPH converter but yeah...there goes your gas mileage ....and top speed.