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Location:
Ipswich
Registered:
May 2002
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Ring gears, pinion gears, ratios etc
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Tue, 14 September 2004 04:11
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As some of you may know, I've been on the lookout for a 4.3:1 ratio for my T-series diff (and an LSD if I can find one cheap enough).
Anyway, as far as I know my diff is out of an RA28 Celica (so I'm told anyway), and has a 3.9:1 ratio. Center is broken, missing bits that should be there. I did count the teeth when I first took it out, but have forgotten now, but I think it was a 43/11 ratio (3.909).
Anyway, I was speaking to the boys at Option1Garage the other day (they seem to be the only people I can get an LSD or gears from, everybody else seems to talk a lot and not deliver, or want a lot of money for their stuff), and they had a Cusco center and ring gear. Ring gear out of a 4.3:1 ratio, 43 teeth. But they don't have the pinion.
Now, looking at this page, it says that the TA23's and some other Celicas had a 41/10 ratio (4.1:1). Not sure how well this applies to the Celicas we have here, but I do know that most of them came with a 4.1:1 ratio so could either be 41/10 or 37/9.
Also, was speaking to Chin (Acoustic) when I was back in Malaysia, and he mentioned that he's got a 4.1:1 now, and he's looking for *just the ring gear* for a 4.3:1 because then he will have a 4.3:1 (reusing the 10-tooth pinion). Or maybe I got that the wrong way around... No, I think he was just looking for the ring gear...
Is this true? Can ring gears/pinions be swapped with each other like that? Or do they have to match each other?
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Location:
Ipswich
Registered:
May 2002
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Re: Ring gears, pinion gears, ratios etc
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Tue, 14 September 2004 04:14
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Also, does anyone know if the 4.1:1 ratio Celicas we got were a 41/10 or 37/9? Or did we get a mix of them?
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Ring gears, pinion gears, ratios etc
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Tue, 14 September 2004 04:16
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Especially when used at all, they don't take too kindly to being mixed+matched
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Location:
Brisbane
Registered:
May 2002
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Re: Ring gears, pinion gears, ratios etc
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Tue, 14 September 2004 04:17
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I'm almost certain the ring and pinion gears come as a matching set.... you can't mix'n'match. Could be wrong but that's my understanding.
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Location:
Ipswich
Registered:
May 2002
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Re: Ring gears, pinion gears, ratios etc
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Tue, 14 September 2004 04:22
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That's what I thought as well, but thought I might check in case I was wrong!
Darn, oh well...
Thanks 
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Location:
Adelaide
Registered:
September 2003
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Re: Ring gears, pinion gears, ratios etc
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Tue, 14 September 2004 04:51
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| Norbie wrote on Tue, 14 September 2004 14:17 |
I'm almost certain the ring and pinion gears come as a matching set.... you can't mix'n'match. Could be wrong but that's my understanding.
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100% correct. The gears are lapped as a set, and with differeing ratios, the actual size/spacing etc of the gear tooth itself is different.
When I had my RA23, I used a 4.1:1 centre from a RT104 Corona, and from memory, it was a 41/10 tooth set.
Oooroo
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Location:
Ipswich
Registered:
May 2002
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Re: Ring gears, pinion gears, ratios etc
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Tue, 14 September 2004 05:01
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Anyone in Brisbane have a spare 4.1:1 center and gears I could buy/borrow? 
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Location:
Terrigal
Registered:
May 2002
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Re: Ring gears, pinion gears, ratios etc
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Tue, 14 September 2004 05:06
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There is heaps of 4.1 T series diffs down in Syd.. Guess thats not much help.
Do you know of a 3.9 F series? I'll swap you for a 4.1 T series
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Location:
Ipswich
Registered:
May 2002
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Re: Ring gears, pinion gears, ratios etc
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Tue, 14 September 2004 05:32
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Hmm, no don't have any F series ones. Only a U series
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Registered:
November 2002
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Re: Ring gears, pinion gears, ratios etc
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Tue, 14 September 2004 05:47
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The lads above have it right, you must buy the ring and pinion as a matched/lapped set, and after counting teeth in my RA23 diff centre, its a 41/10 combination for a final drive ratio of 4.100 exactly.
Now, if you like working parts miracles, here is one for you. Search all your import yards and wreckers for a grey import YM40 Liteace van, and you need it to be 4WD and in a manual (only). They have a front (yes - front, and the rear is an E or F series diff) differential ratio of 4.3:1 (43/10) and 6.7 inch ring gear diameter, making it a 'T' series diff, in a manner of speaking.
You won't be able to use the housing, but the internals of this will fit your RA23/28 diff housing.
I learned this from a kiwi friend who said that this swap has been done successfully in NZ for some time now.
And yes, good luck - goes without saying really.
Mitch.
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Location:
Brisbane
Registered:
May 2002
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Re: Ring gears, pinion gears, ratios etc
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Tue, 14 September 2004 05:53
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Manual RT104 Coronas have a 4.1:1 T series diff and these things are common as dirt... should be able to pick up a centre for next to nothing at the wreckers.
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Location:
Ipswich
Registered:
May 2002
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Re: Ring gears, pinion gears, ratios etc
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Tue, 14 September 2004 06:05
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Norbie: Best quote I have so far is $75 from Wacol pick&pay, to be taken out by me. Or for an extra $25 I can have the rest of the diff too (might as well, for spare axles).
Are the axles the same between the TA22-RA28? Or are they different lenghts?
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Banned user
Location:
ADELAIDE - The Drift City
Registered:
July 2002
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Re: Ring gears, pinion gears, ratios etc
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Tue, 14 September 2004 06:36
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FWIW: just get the 4.11 from the TA22, theres stuff all noticable difference between that and the 4.3 ratio.
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Club Member
Location:
sydney
Registered:
May 2002
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Re: Ring gears, pinion gears, ratios etc
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Tue, 14 September 2004 06:50
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ok I know nothing but here goes...
technically you can mix and match with the 4.1 and 4.3 ring gear re lapping the sets to match isnt that big a deal and most good diff rebuilders can do this for you ( reluctantly ) youll need to find someone whos willing to go to the effort which is not neccesarily easy as most cant be arsed and will give you all the above reason for them not to do it.
BUT....
there may be an issue matching the 4.3 to the 4.1 because ive heard that the 4.3 ring gear is actually a lot thicker?, weither that be the tooth spacing or the gear itself i cant say. if anyone has some shots of a 4.1 that are clear i can match them up to pics of a 4.3 i have to maybe try and confirm this. If thats true ( and I cant really see why it would be but hey thats toyota for ya ) then you wont be able to match the two together.
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Location:
Ipswich
Registered:
May 2002
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Re: Ring gears, pinion gears, ratios etc
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Tue, 14 September 2004 07:03
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Simon: You recon? There's a fair difference between my KE35 4.1:1 and 4.3:1... I'm currently running the 4.3:1 and it's great.
I'd probably be content with 4.1:1, but I'd really like a 4.3:1 if I can find one...
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