Q45 Diff question help please

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Badazzsr20
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Q45 Diff question help please

Post by Badazzsr20 »

im getting ready to do a swap i picked up a 1997 Q45 diff to swap into my s14. i picked the 1997 q45 diff cause a site im useing to help with the install said that the 1997-01 are 3.69 gears. so as i read on it tells me a parts list needed witch is

Parts list needed:

A.) (Your Model S13 or S14) differential cover
B.) Q45 VLSD differential
C.) Q45 or 300ZX TT Wheel Hubs (great upgrade for the 4-lug guys who have been looking for a reason to go 5-lug)
D.) 300ZX TT Driver Side Axle (installed on driver side of 240SX) and Infiniti Q45 Driver Side Axle (installed on passenger side of 240SX)


so when i grabbed my diff i also grabbed Infiniti Q45 Driver Side Axle so all i need now is a 300ZX TT. so this all sounds great but heres my question as i noticed in the pictures of the TT axle and the Q45 axle there different bolt patterns the Q45 i have with my diff are both 5bolts for the axle to bolt up too and the TTaxle is a 6bolt?

so whats going on here do i have the wrong diff did this site just make me buy a wrong diff cause he stats that
The 90-96 Q45 had a 3.54 final gear, and the 97-01 had a 3.69

i got a 1997 its just 5 bolt im just needing to understand what is wrong here is he calling for the wrong axle?

if anyone can please help me with this i would deeply appreciate it!

thanks
Marcus
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Re: Q45 Diff question help please

Post by Marcus »

Where are you seeing these pictures? The 5 bolt assembly has a better cv shaft due to twice the ball bearings and you need the TT axle for the 31 spline axle. I did this and it is not easy to get the z32 axle at a reasonable price. I'm not completely versed with z32's, but 5 bolt should be right. Thus the picture source is important.
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Re: Q45 Diff question help please

Post by shift_down »

You need both axles of the q45 and they are a direct swap. Or you can just switch the internals into your s13-s14 differential and you are good to go.
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Badazzsr20
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Re: Q45 Diff question help please

Post by Badazzsr20 »

shift_down wrote:You need both axles of the q45 and they are a direct swap. Or you can just switch the internals into your s13-s14 differential and you are good to go.
well i dont have both i only grabbed the one side..... are they stronger then the j30s cause maybe i can use them instead cause i dont have the other Q45 axle.....
BoBaCk1
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Re: Q45 Diff question help please

Post by BoBaCk1 »

The 97-01 q45 diff has the 5 star output shafts. To use this diff all you need are 5 star axles from a j30 pre 95 year j30's. If you want to use this diff and upgrade to the strong axles your gonna need the z32 tt left axle,q45 left axle,q45 hubs and the output shafts from the 90-96 q45.
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Badazzsr20
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Re: Q45 Diff question help please

Post by Badazzsr20 »

BoBaCk1 wrote:The 97-01 q45 diff has the 5 star output shafts. To use this diff all you need are 5 star axles from a j30 pre 95 year j30's. If you want to use this diff and upgrade to the strong axles your gonna need the z32 tt left axle,q45 left axle,q45 hubs and the output shafts from the 90-96 q45.

you sir are a god!! thank you for the very very useful info!! this is what i need to know! thank you all again for the help ill let u know what i deside to do im putting down 550ish u think the j30s will hold up to hard launches heard there good for 500ish

P.s what q45 hubs do i need from the 97-01 or the 90-96? also wont the s14 5lug hubs work or i will have to change them the q45?
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Re: Q45 Diff question help please

Post by Marcus »

They're bigger spline. J30 axles will work with s14 hubs. Bigger axles from z32 tt and q45 will not.
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Re: Q45 Diff question help please

Post by Badazzsr20 »

this is perfect info man thanks everyone for the help!!! i just need to know my last question what q45 hubs do i need from the 97-01 or the 90-96? or does it not matter?

and also can i use NON turbo 300zx axles being that there 5star too?
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Re: Q45 Diff question help please

Post by BoBaCk1 »

I can only confirm that the 90-96 hubs work on our cars. Haven't tried or heard of anyone using the 97-01. As for the 300zx axles I'm pretty sure they would work as long as they are the same lengths as the 240's own. But I know for sure the pre 95 j30 axles work. That's what I'm using on my car for now.
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Re: Q45 Diff question help please

Post by RosadoRacing »

you can use the driver side 300zx axle on the passenger side of the 240. that's what I run but both j30 axles fit
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Re: Q45 Diff question help please

Post by Badazzsr20 »

Ok I'm starting this swap but I have question??

Ok so on the diff from the q45 97-01 diffs are 5bolt out put shafts. The 300zx TT axles are 6bolt and the q45 axles is 5bolt how do I use the diff with the TT 300zx axle if it's 6bolt?

All the output shafts I seen from a q45 are all 5 bolt? What year are the output shafts 6bolts what the 300zxTT axle will work and what year axle from the q45 is 6bolt?
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Re: Q45 Diff question help please

Post by s14fiend »

Not to thread jack but there is some dude in Georgia that made some custom CNC j30 spacers for the (In 2s) 6bolt diff output shafts..... Might be "cheaper to keep her" if you know what I mean.
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Re: Q45 Diff question help please

Post by Badazzsr20 »

That won't work cause the 300zx TT axle is a 6 bolt but are separated. So there not (in 2)6bolt style. I'm trying to find out witch output shaft front he q45 are individual 6bolt Pattern so I can use the q45 axle and the 300zx TT axle for the axle upgrade?

Please anyone know what year has the individual 6bolt pattern
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Re: Q45 Diff question help please

Post by s14fiend »

I hate to be the one to break it to you but as far as I'm concerned you need a '90-'95 q45 diff to use the combination your suggesting. The differential you have can only run N/A 300zx 5 bolt axles. As far as what I have read on the forums. You could try it though but then your messing up someone in the future that's trying to run a 3.54 q45 diff by taking up the already rare 6 bolt axles lol
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Re: Q45 Diff question help please

Post by Badazzsr20 »

The 90-96 is a 3.54 gearing. I have the 3.69 gearing. I can use the 5 bolt but I don't want to. I need to upgrade my axles. So you have to remove the 5bolt output shaft from the diff and make them 6bolt. Everyone is saying get it from the q45....

What year Q45 do I get the 6bolt from. All the ones I seen they were all 5bolt. Anyone know witch q45 or what car I need to get this 6bolt from?
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Re: Q45 Diff question help please

Post by s14fiend »

The 90-96 q45 uses that and what your looking for can be ordered on courtesynissan it's called half shafts brand new. Your question has been answered the year is 90-96 q45
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Re: Q45 Diff question help please

Post by Badazzsr20 »

90-96 are 5bolt and I believe 6boly but in 2s. I'll go look again to comfirm this I'll let you know.

Thank you all!!
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s14fiend
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Re: Q45 Diff question help please

Post by s14fiend »

Dude are you trolling or something?! I'm telling you what it is for the big 6 bolt axles it's 90-95 q45 without a doubt 96 is the year where it would potentially vary.
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Re: Q45 Diff question help please

Post by Badazzsr20 »

I'm not trolling I am telling you that I have looked at 90/96 q45/ and seen 5bolt. Maybe I looked at it quick and didn't realize that's it's a 6. I'll go and take a look again and take it from there. Your saying that on the diff itself that the axles connect to are 6 individual bolts then ok I'll go and grab them.
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Re: Q45 Diff question help please

Post by rusolena »

I have written an article about my findings and how to do it on a s14 model. Almost all the info you may need is here. If not, feel free to PM me and I will try to assist you as much as I can. I hope you find this article useful.

viewtopic.php?t=53264
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Re: Q45 Diff question help please

Post by Badazzsr20 »

Thank you guys very much I'll be heading out to the yard this Friday to get the parts needed. I'll see if I can find this 6 individual bolts that I need to get this swap done.

I'll let you guys know Friday!!
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Re: Q45 Diff question help please

Post by rusolena »

Just a reminder. If you get the earlier diff from the Q45 used the half shafts that have the 6 bolt pattern like a star. They are the strongest by structure being that all 6 wholes are evenly separated and therefore less stress vs the 2 by 3 pattern as seen on others. Just my 2 cents. Good luck with your findings at the junk yard body.
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Re: Q45 Diff question help please

Post by Badazzsr20 »

That's the one I'm looking for the 6 star looking one. Everyone saying that's the 90-96 q45 so I'm going to get it Friday I don't one the 3 2bolt ones.
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Re: Q45 Diff question help please

Post by Badazzsr20 »

Btw guys I'm looking for the 300zx TT driver side axle on car-parts what would that listed as?
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Re: Q45 Diff question help please

Post by jmac636 »

In my s14 with a turbo ls1 t56 I'm using q45 diff with 350z axles. On the right side the axle is a tad bit shorter so used a spacer. Been ripping this for over a year with no issues. I used 350z axles from the shortest side of the two. Just can't recall Which side I used. I measured then went to a junk yard and measured them extended and compressed. I'll add more detail when I have time.
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s14fiend
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Re: Q45 Diff question help please

Post by s14fiend »

Badazzsr20 wrote:Btw guys I'm looking for the 300zx TT driver side axle on car-parts what would that listed as?

By the way man I just re-read your first post and it seems you have the newer 97+ Model differential from the q45 that has different gearing and different splines on half shafts.

Generally speaking when people talk about the q45 diff swap they speak of the star 6 bolt (picture attached) half shaft swap of the 90-95 year Q45 Infiniti.

People that talk about the Q45 swap mean that specific bolt pattern cause it's larger and suitable for a good amount of power without sacrificing the overall dynamics and integrity of car and without having to do anything crazy custom like back half and keep it relatively "street" oriented. They do not talk about the 97+ model differential since it's easier to some degree to buy jdm used or usdm used non turbo 300zx differentials with the pattern half shaft of 5 bolt..... in addition to it actually being potentially cheaper than 97+ Q45 differential.

If you have the 97+ Q45 Differential either your going to have try to sell it or just put it to use using non turbo 300zx axles. (Maybe even try to rig it somehow)

Again, if you have a 97+ Q45 diff it more than likely uses the 5 bolt axles and YOU DO NOT need to run any 300zx turbo axle/Q45 combo of axles.

Good luck.

P.S. I hope people read this so I don't have to make a tutorial lol.
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