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R34GT-Four Vibrating and clicking

B-rice
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B-rice Mentor

B-rice

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R34GT-Four Vibrating and clicking

Im in the process of buying a R34GT-Four coupe. I inspected the car and seems like the car vibrates almost like the drive shafts have been blown. So I looked at the the tyres on the vehicle and he has different wheel widths. Now im in the process of finding out how much this will all cost to fix the issue.I have a few questions Does anyone have any experience with this on their cars.

I was going to drop in a RB25 AWD turbo engine. But im worried that the AUTO engine may have a different RC ratio. I checked, RC = 4.3 and found out from the Forums that RC 43 means it was auto. It has been changed to a manual.
I need some direction on what to look out for and if it will be possible to drop in a turbo engine (Auto) with RC 43

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KiwiRS4T Grand Master

KiwiRS4T

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If front and rear rolling radius is not the same the transfer case could be stuffed. Or it just has stuffed cv joints. Any turbo AWD you get will have a 4.1 diff which means you have to change the c/w and pinion in the sump or the diff at the back to match.

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Toff Contributor

Toff

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I thought R34 GT Fours had the 4.3 final drive? 

4.1111 R34 RB25DET manual/auto

4.083 R34 RB25DE auto

4.363 R34 RB25DE manual

 

Wheel widths shouldnt make a difference but i would be worried if the profile is taller/smaller as said above.

 

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B-rice Mentor

B-rice

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If front and rear rolling radius is not the same the transfer case could be stuffed. Or it just has stuffed cv joints. Any turbo AWD you get will have a 4.1 diff which means you have to change the c/w and pinion in the sump or the diff at the back to match.


That's great this is the information I'm hunting out for. Trying to get as much information as it is a risky purchase.
I understand that, if the RC at the front is 4.1 the rear will have to match this too. Is there anything else that I need to do so it works smoothly? Currently the car has RC 4.3
received_535503653448064.jpeg

I'm getting JEM to have a thorough look at it to see the extent of the damage.
I'm quite handy with my hands so I could do the rest myself provided I know what's wrong with it.
KiwiRS4T Grand Master

KiwiRS4T

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1 hour ago, B-rice said:

 



I understand that, if the RC at the front is 4.1 the rear will have to match this too.



 

 

Alternatively you could take the front diff you have now and transplant it into the turbo casing. But if you leave the front and put a 4.1 into the rear you could look for a proper mechanical LSD

B-rice Mentor

B-rice

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I'm buying a turbo neo engine. I think it would be better to use the diff that comes with the turbo engine (4.1). Just from a quick search seems like the 4.1 ratio is more popular. Not sure if there any disadvantages with going to a 4.11 ratio.
So correct me if I am wrong, 4.1 at the front and 4.1 at the back. Would I need to change anything inside the box/transfer case?

B-rice Mentor

B-rice

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Update, car came back from one of the "reputable" garages in Sydney. They reckon the steering rack is what is causing the car to vibrate while driving. I was trying to think how the ticking is in any way or form related to the steering rack. Maybe some one can educate me on GT-Fours.

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