R32 Gts-4 Rear Diff

[ima_slap_joO]

Hi guys, ive got an r32 gts4 with an r32 gtr rear diff and standard front diff. The standard rear diff was driven by the previous owner without enough oil, so i know that diff is no good, it really grinds if you try to drive with that diff in. I have an r32 rear diff to get me by until I can replace with another gts4 diff. I was wondering if the crown and pinion gear ? unsure if they are the two parts, but are they interchangable with the gtr's crown and pinion gear?

[T04GTR]

yes. just swap then out. but you will have to get it done buy a diff place.

[Moodles2]

There is an issue with running the GTS4 and GTR diffs, they have different ratios.

[ima_slap_joO]

There is an issue with running the GTS4 and GTR diffs, they have different ratios.

I know there is an issue, thats why I am trying to get the gts4 diff back. I am currently RWD.

Is the gtr diff mechanical and the gts4 diff viscous? Are the crown and pinion gears interchangeable anyway?

[ima_slap_joO]

Is the gtr diff mechanical and the gts4 diff viscous? Are the crown and pinion gears interchangeable anyway? I dont want to remove my diff only to find out they wont match, do I need the crown gear only, or the crown gear and the other gear which turns the crown gear?

[KiwiRS4T]

You'll have to check the front diff ratio. The GTR is 4.1:1 so the previous owner should have changed the front diff to suit (unless he is available to be asked). I think the GTS4 is 4.3:1

[ima_slap_joO]

You'll have to check the front diff ratio. The GTR is 4.1:1 so the previous owner should have changed the front diff to suit (unless he is available to be asked). I think the GTS4 is 4.3:1

Yeah, I know the front diff is the standard gts-4 diff, 4.375, but i cant run 4wd cos of the rear diff issue, i have the standard diff out of the car, i wanted to swap the gears over to the working gtr diff i currently have on the car, i was wondering if the gears are directly interchangable, even though one is viscous, one is mechanical.

[blind_elk]

You will be able to swap the GTS4 gears (crown wheel and pinion) into the GT-R diff. But you must do BOTH - you can't just swap the crown wheel OR the pinion.

There wil not be any problem with the GT-R centre being mechanical LSD and the GTS4 being a viscous LSD. In fact, you are probably better off with the GT-R's mechanical centre,

[chrisking666]

You will be able to swap the GTS4 gears (crown wheel and pinion) into the GT-R diff. But you must do BOTH - you can't just swap the crown wheel OR the pinion.

There wil not be any problem with the GT-R centre being mechanical LSD and the GTS4 being a viscous LSD. In fact, you are probably better off with the GT-R's mechanical centre,

Copy that, I changed my rear diff gears on friday, from 4.11 to 4.375, no problems at all!

Much better to drive, 3rd gear is way closer to 2nd now and the whole car fells much more responsive!! Win Win

[ima_slap_joO]

I asked a diff place in western Sydney if they could check the condition of the GTS4 diff on Thursday, as i know it had been run without enough oil which caused the grinding noise. The guy said

everything is faulty, crown, pinion, bearings, all without even looking at it. It hadn't been run with no oil, where is definitely an issue because it is grinding but I was hoping maybe

the bearing has failed, and the crown and pinion would be OK. He would not even open it to have a look, is there anyone who could possible help me diagnose what parts are faulty? I know the

bearing is definitely gone, but I am hoping the gears are OK, it wasn't driven around for long after the noise occured so I am hoping no shavings damaged anything else. Anyone help?

[blind_elk]

Must be Superman (has X-ray vision) if he can tell the condition without opening the unit!

You just need to take off the rear cover plate to inspect the innards. Then find another diff specialist to confirm or deny the condition of the crown wheel and pinion - these are the only bits that need to be in OK condition.

[ima_slap_joO]

OK, so me and a mate have finally taken the gts4 diff apart, I can confirm that there is physical damage to the bearings and cage which sit at the rear of the crown gear (where the drive shaft meets the diff). There seems to be no damage to the main gears, with no scoring on any of the main contact surfaces, and little to no wear on any moving part. The crown gear seems to be seated in the housing quite well and blunt force does not seem to dislodge the casing. Also, I cannot see how I can remove the faulty bearing cage. From what I can tell only the one bearing cage at the very front of the pinion is faulty.

So three questions, how do I remove the pinion gear from the diff housing? How do I remove the bearing cage for replacement? And where could I get a replacement bearing cage from?

I also have that gtr diff on the car currently which I could possible salvage parts from, but I would rather get a cheap gts-t diff or something for the parts I require, so if the bearings are the same part that would be cool.

Thanks for the input

[KiwiRS4T]

From memory you take out the crownwheel and then knock the pinion in but before you take to it with a sledgehammer get someone to confrim that!

Here's a bit of a long winded how to (I'm a bit rougher myself) - you can put it back together yourself but ideally its properly set up by a diff shop or you could just get a complete diff and swap it over:

http://www2.dana.com/pdf/AXSM-0053.pdf