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Xinx
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December 2003
AE86 Diff (Will this work?) Tue, 30 March 2004 06:58 Go to next message
Hi,

I've been thinking about changing the ratio of my S Series Diff from a 3.9 to a 4.1.

First of all I have a 3.727 S Series diff and a 3.9 standard Aust spec diff. The 3.727 has a 41 teeth crown wheel and 11 teeth pinion while the 3.9 diff has a (correct me if I'm wrong) 39 teeth crown wheel and 10 teeth pinion.

So I'm wondering, how about if I use the 10 teeth pinion from the 3.9 and match it with the 41 teeth crown wheel from the 3.727 which would give me a ratio of 4.1. Will this work? will the 10 teeth pinion be compatible with the 41 teeth crown wheel? I think this will work, but then again I don't really know how gear and stuff work Rolling Eyes ...

Thanks

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Norbie
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Re: AE86 Diff (Will this work?) Tue, 30 March 2004 07:01 Go to previous messageGo to next message
No, you can't mix-and-match the crownwheel and pinion; they go together as a pair.
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._T_.
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Re: AE86 Diff (Will this work?) Tue, 30 March 2004 07:10 Go to previous messageGo to next message
well you can - but they will not work to well!! you can only mix & match when the parts are new (within reason)

there is a story about colin chapman making a 4.1:1 diff out of parts this way in a hillclimb car - but he ran the diff for 100miles on a cutting paste then threw away the bearings etc - just kept the ring/pinion. me thinks it's easier just to get the right parts.

T
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Xinx
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Re: AE86 Diff (Will this work?) Tue, 30 March 2004 08:25 Go to previous messageGo to next message
So I can't mix pinion and crownwheel Confused I really want to find out for sure, but I can't be bother pulling out the 3.9 diff since it is still on the car. Anyway so anyone know if there is other S Series centre that has a 4.1 ratio?


Thanks
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Sam_Q
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Re: AE86 Diff (Will this work?) Tue, 30 March 2004 09:14 Go to previous messageGo to next message
doesnt the T-18 run a 4.3:1 ratio?
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mrshin
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Re: AE86 Diff (Will this work?) Tue, 30 March 2004 11:54 Go to previous messageGo to next message
Nope. The T18s run a T292, 4.3 T diffs are kinda hard to find. Plus the gears won't fit an S diff Evil or Very Mad
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FKN16V
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Re: AE86 Diff (Will this work?) Tue, 30 March 2004 12:52 Go to previous messageGo to next message
mrshin wrote on Tue, 30 March 2004 21:54

Nope. The T18s run a T292, 4.3 T diffs are kinda hard to find. Plus the gears won't fit an S diff Evil or Very Mad



Would the t series diff bolt straight up, you would need to modify the prop of course.
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ae95
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Re: AE86 Diff (Will this work?) Tue, 30 March 2004 15:28 Go to previous messageGo to next message
T series bolts up. You need the t18/jdm ae86 tailshaft because it is slightly shorter.
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Xinx
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Re: AE86 Diff (Will this work?) Tue, 30 March 2004 16:05 Go to previous messageGo to next message
The reason for going through all the trouble of mix and match crownwheel and pinion is that I don't really want to do a rear end swap, and its not like T series rear end is cheap or easy to find.

btw what type of diff is in an Aus spec T18? and what the hell does a TE35 look like? do they sell them in Australia?

thanks
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ae95
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Re: AE86 Diff (Will this work?) Tue, 30 March 2004 16:59 Go to previous messageGo to next message
T18 has a T series diff. Theyre cheap as chips and you can get an lsd for them, ie zenki ae86 lsd.

have fun

-ian
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Xinx
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Re: AE86 Diff (Will this work?) Wed, 31 March 2004 15:45 Go to previous messageGo to next message
ae95 wrote on Wed, 31 March 2004 02:59

T18 has a T series diff. Theyre cheap as chips and you can get an lsd for them, ie zenki ae86 lsd.

have fun

-ian


Are you sure about this Ian? I'm talking about local T18 Toyota with rear drum not imported one. I thought they use the same diff as the Sprinter.. anyway how cheap is cheap? you wouldn't have one laying around would you? Very Happy
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Norbie
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Re: AE86 Diff (Will this work?) Wed, 31 March 2004 23:41 Go to previous messageGo to next message
Yes, all T18's have T series diffs, as do most live-axle Celicas. I've seen plenty of T18's at the wreckers with diff intact, and you can typically pick one up for $100 tops.
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ra23celica
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Re: AE86 Diff (Will this work?) Thu, 01 April 2004 00:04 Go to previous messageGo to next message
If you really want to get up and boogie off the line, hunt down a 4WD Liteace Van Wagon and grab the front (yes, front) differential out of that, its a 4.3 ratio (usually, model dependent) and the crown wheel and pinion does fit into a T series centre.
Cheers,
Mitch.
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ae95
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Re: AE86 Diff (Will this work?) Thu, 01 April 2004 07:45 Go to previous messageGo to next message
Yes im 100% certain.
And yes they are bloody cheap. Try a pick a part type wrecker if your competent with the work, theyre ussually the cheapest. Or maybe look through the paper for someone wrecking one.

have fun

-ian
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wraith
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Re: AE86 Diff (Will this work?) Thu, 01 April 2004 14:25 Go to previous messageGo to next message
Can the T18 diff be disc braked without trauma? Any ideas?
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ae95
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Re: AE86 Diff (Will this work?) Thu, 01 April 2004 16:16 Go to previous messageGo to next message
Could be done.

Get some brakes which are bigger than the stock ae86 ones Twisted Evil
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Sam
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Re: AE86 Diff (Will this work?) Thu, 01 April 2004 20:45 Go to previous messageGo to next message
remember T18's run a 3.7:1 diff.. make sure you grab the tailshaft as well, I think they're slightly different lengths.

Otherwise I think an RA40 diff will also bolt up, and runs a 4.1:1 centre.

But I've never done it, so don't hold me to it. Just get out to Pick'n'Payless with a tape measure Smile

sam
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ae95
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Re: AE86 Diff (Will this work?) Thu, 01 April 2004 21:54 Go to previous messageGo to next message
Yep you need the t18 tailshaft. Its only slightly shorter but you will need it.

Dont know about the RA40 conversion, anyone got more info on it?

thanks
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wraith
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Re: AE86 Diff (Will this work?) Sat, 03 April 2004 14:36 Go to previous messageGo to next message
ae95 wrote on Fri, 02 April 2004 00:16

Could be done.

Get some brakes which are bigger than the stock ae86 ones Twisted Evil



OK. Nissan Skyline R32 GTS discs and calipers. Pretty sure theyre 4 stud. I'll weild the oxy, you tell me what I have to do....

Then we combine it with this front brake kit http://www.technotoytuning.com/t3_site_pages/produ cts/big_brakes.html
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ae95
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Re: AE86 Diff (Will this work?) Sun, 04 April 2004 08:43 Go to previous messageGo to next message
Nice brakes.

If your talking about the non turbo r32 then yes its 4stud, so is the r33. R34 n/a is 5stud.
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wraith
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Re: AE86 Diff (Will this work?) Mon, 05 April 2004 10:12 Go to previous messageGo to next message
Hmmm, can get the diff, can probly get the brakes & calipers, now, how to make it work? Any ideas? Anyone done anything remotely like this before?
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wraith
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Re: AE86 Diff (Will this work?) Mon, 12 April 2004 12:49 Go to previous messageGo to next message
OK, got the concept sussed, will hit the wreckers with a tape measure to see if the T-18 diff is OK width wise. Probably have to fabricate my own backing plate, I'll talk to some local engineers, see if they can make em for me. My current S series has a buggered wheel bearing I can't get out, hence the need....
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Simon-AE86
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Re: AE86 Diff (Will this work?) Mon, 12 April 2004 14:06 Go to previous messageGo to next message
just use the T18 backing plates, pull out the S series and put the T series in,dont waste time measuring as myself and others on here will vouch for the fact it WILL fit.
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wraith
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Re: AE86 Diff (Will this work?) Mon, 12 April 2004 14:52 Go to previous messageGo to next message
When I refer to the backing plate, I mean the bit the caliper hangs off of. This is how I have observed the disc brake to work on a R31 Pintara diff, anyway.
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wraith
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Re: AE86 Diff (Will this work?) Mon, 12 April 2004 15:04 Go to previous messageGo to next message
Also, is there ANY difference in the width whatsoever? I am quite tight for room wheel-wise. Other than that, I gather the housing is a bolt in fit.
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inark
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August 2004
Re: AE86 Diff (Will this work?) Fri, 03 June 2005 07:30 Go to previous messageGo to next message
hey look! the search function does work! Wink

ok... so for me to install a Kaaz 2way in an aus spec sprinter i will need to get a T series (T18) diff housing and the prop shaft and thats it?

im a complete n00b when it comes to mechanics and understanding how shit works but im pretty good with working on shit once i know how it works.

now... people are going to get angry at what im going to ask but i have been looking though threads including the ones at the top which i thought would have had stuff on what im about to ask as i thought it would be quite common to do.

1. when i get the diff and tail shaft do i simply bolt the old drums back on to the T series or do i use the drums that are already on it if i remove it with everything or is that just not how it works at all Embarassed Embarassed

i'll continue to search thru the thousands of threads that mention diff in the meantime.

thanks.
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Sam_Q
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Re: AE86 Diff (Will this work?) Fri, 03 June 2005 15:13 Go to previous message
can someone confirm if the liteace diff gears fit into a t-18 housing?
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