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qagzie
14th March 2015, 04:50 PM
My LN4* hilux diff ratio is 4.875 (R=39, P=8). however i need to change it to 3.91. Now, i have checked on toyodiy.com and most hilux(es) that came with a 3.9 diff had Ring gear=39 teeth, Pinion=10 teeth.

Should i just look for another hilux Pinion with 10 teeth and swap it into my diff without changing the Crown ring sisnce it already has the 39 teeth?

.....

max.
bunki86
14th March 2015, 05:00 PM
no, get new ring gear and pinion.

old ones are worn together.
qagzie
14th March 2015, 05:19 PM
no, get new ring gear and pinion.

old ones are worn together.


Makes sense. thanks
LittleRedSpirit
14th March 2015, 10:11 PM
They are matched sets from the day they are made, nobody ever sells just the crown wheel new or just the pinion. The only people selling them separate are ebay scammers that want to rip off kids that don't know the difference.
Matt
14th March 2015, 11:49 PM
Diff gears are surprisingly complex, even though they are quite simple on the surface. Each gear is stamped with markings which let the person know who is setting it up what is required.

But yeah as the others have said, crown wheel and pinion are a pair and really can't be separated as they wear evenly together.
qagzie
15th March 2015, 12:21 AM
been to the wreckers today trying to find a 3.91 hilux diff (crown and pinion set) but no luck yet. Will try again 2moro. Otherwise i might have to buy a new set (expensive) :S

thanks everyone.
LittleRedSpirit
15th March 2015, 11:59 AM
Hilux has a few different diff sizes so be careful and check the build plate to make sure if its G E or T series. Plus a front diff will spin the other way so dont get caught out with those.
bunki86
15th March 2015, 07:46 PM
i bought new g series 3.73:1 cw/p from local diff shop for around 400$
LittleRedSpirit
15th March 2015, 08:35 PM
Thats pretty decent especially if its a good make.
bunki86
15th March 2015, 09:02 PM
drivetech 4x4 was the brand, i had never heard of them.
qagzie
16th March 2015, 12:55 AM
Well, i've seen a Yukon Gear set online, part# YG T8-390 going for $230.48. I'll save up and buy this one.

here's the link: http://paceperformance.com/i-20692917-yukon-gear-axle-ring-and-pinion-gear-set-yg-t8-390.html


.....

max
bunki86
16th March 2015, 01:18 AM
that will be around 400 by the time you get it.

oops that was with au to us currency conversion n shipping. i dont know what it would be to uganda.
qagzie
19th March 2015, 06:26 AM
that will be around 400 by the time you get it.

oops that was with au to us currency conversion n shipping. i dont know what it would be to uganda.


it's relatively more expensive ofcos...

i'm actually changing my mind about the 3.9 ratio. i'm thinking that a 3.54 ratio would be perfect for a W55 on a 1uz instead. i hope 3.54 ring and pinion gears are more common.

i'll head out this weekend on a new search...:oh:

......

max