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RB30 skyline diff gears 

 

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 Post subject: RB30 skyline diff gears
Posted: Tue Jul 19, 2005 4:09 pm 
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Hi, just got a hold of some skyline RB30 diff gears, the 3.9 or 4.1's or whatever. My question is if it can actually fit? I'm assuming the pinion will be needed from the same ratio diff.

Ive got a 3.27 diff at the moment, but shredded my gears, and these were really cheap...


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Posted: Tue Jul 19, 2005 4:13 pm 
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you only got the crownwheel???? without the pinion, its not worth much..... matched pair

 

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Posted: Tue Jul 19, 2005 4:16 pm 
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he's got a pinion... he's bringing it tomorrow.. with the crown.. but he's not sure about the pinion's ratio..

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Posted: Tue Jul 19, 2005 4:57 pm 
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one would assume it would be the same as it would need to be? Probably a matched pair?

 

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Posted: Tue Jul 19, 2005 4:58 pm 
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the pinion alone doesnt determine the ratio, it's the combination of the number of teth on the crownwheel and the number of teeth on the pinion

IIRC the skylines were a 3.9:1, but dont quote me on that

 

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Posted: Tue Jul 19, 2005 5:02 pm 
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yeah, he said 3.9/4.1 we'll see.
So if the pinion's right it will drop in?

also how do you determine the ratio with pinion and crown? just count the number of teeth on both, and crown/pinion..right?

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Posted: Tue Jul 19, 2005 8:29 pm 
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I hope you enjoy whining diff's as R31's came factory standard with them. Nissan had a program for 8 years to replace, free of charge, diff's in R31's due to whining. They'd make 30,000km then start whining again. So you'd have it replaced again. Ask me how I know :)

Last edited by Bozz on Wed Feb 22, 2006 7:41 am, edited 1 time in total.

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Posted: Tue Jul 19, 2005 9:08 pm 
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I was under the impression that the R31 Skyline autos had a 3.7:1 ratio, and the manuals had 3.9:1 ratio. Both of which are 25 spline 2 pinion centres. The Sillohettes had the 28 spline 4 pinion centres. I recall pulling apart a few skyline diffs and counting the splines when i was chasing an LSD centre for my VL.

The pintaras definatly had 4.1:1 ratios.

 

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Posted: Tue Jul 19, 2005 9:26 pm 
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hornet wrote:
I was under the impression that the R31 Skyline autos had a 3.7:1 ratio, and the manuals had 3.9:1 ratio. Both of which are 25 spline 2 pinion centres. The Sillohettes had the 28 spline 4 pinion centres. I recall pulling apart a few skyline diffs and counting the splines when i was chasing an LSD centre for my VL.

The pintaras definatly had 4.1:1 ratios.


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Posted: Tue Jul 19, 2005 11:00 pm 
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hmm. they must be 3.7's then.. although he said 3.9's... will see tomorrow.


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Posted: Tue Jul 19, 2005 11:16 pm 
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usually the ratio is stamped on the pinion nose and crownwheel, but the way to calculate the ratio is to divide the number of crownwheel teeth by the number of pinion teeth.....

not 100% sure if it will fit (IIRC there's a couple of different carriers), but make sure when the gears are installed that the contact patterns are checked, etc

 

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Posted: Wed Jul 20, 2005 1:22 am 
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Bozz wrote:

I hope you enjoy whining diff's as R31's came factory standard with them. Nissan had a program for 8 years to replace, free of charge, diff's in R31's due to whining. They'd make 30,000km then start whining again. So you'd have it replaced again. Ask me how I know :)


you either a, worked for nissan or b had a r31

 

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Posted: Wed Jul 20, 2005 1:40 am 
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or c he put nissan gears in his diff?

Thanks for the information Interceptor...I will check it out.

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Posted: Mon Jul 25, 2005 4:06 am 
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Ok, installed the gears... first gear ratio change for me.. um, they ended up been 4.11's. The pinion he lost so I had to go to the wreckers and get one.

anyway, stuck the gears and pinion in, and goes um..... quick but this noise it makes is horrible!
you know that noise that a bus makes? its not whining, its defiantely something bigger lol. MitchG911 was saying about adjusting the pinion, thought you guys might have some input?

Cheers

 

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Posted: Mon Jul 25, 2005 9:00 am 
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justfordima wrote:
Ok, installed the gears... first gear ratio change for me.. um, they ended up been 4.11's. The pinion he lost so I had to go to the wreckers and get one.

anyway, stuck the gears and pinion in, and goes um..... quick but this noise it makes is horrible!
you know that noise that a bus makes? its not whining, its defiantely something bigger lol. MitchG911 was saying about adjusting the pinion, thought you guys might have some input?

Cheers


Bozz wrote:
I hope you enjoy whining diff's as R31's came factory standard with them. Nissan had a program for 8 years to replace, free of charge, diff's in R31's due to whining. They'd make 30,000km then start whining again. So you'd have it replaced again. Ask me how I know icon_smile.gif


In other words, I thought I conveyed that R31 diff's are rubbish but it didn't get through :)
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