Author | Topic |
Location: Perth
Registered: December 2003
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AE86 Diff (Will this work?)
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Tue, 30 March 2004 06:58
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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 ...
Thanks
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Location: Brisbane
Registered: May 2002
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Re: AE86 Diff (Will this work?)
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Tue, 30 March 2004 07:01

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No, you can't mix-and-match the crownwheel and pinion; they go together as a pair.
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Location: Melbourne
Registered: May 2002
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Re: AE86 Diff (Will this work?)
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Tue, 30 March 2004 07:10

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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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Location: Perth
Registered: December 2003
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Re: AE86 Diff (Will this work?)
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Tue, 30 March 2004 08:25

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So I can't mix pinion and crownwheel 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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Location: S.E suberbs, Vic
Registered: December 2003
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Re: AE86 Diff (Will this work?)
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Tue, 30 March 2004 09:14

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doesnt the T-18 run a 4.3:1 ratio?
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Location: Montrose, VIC
Registered: May 2002
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Re: AE86 Diff (Will this work?)
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Tue, 30 March 2004 11:54

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Nope. The T18s run a T292, 4.3 T diffs are kinda hard to find. Plus the gears won't fit an S diff
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Location: NSW, East Coast
Registered: July 2003
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Re: AE86 Diff (Will this work?)
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Tue, 30 March 2004 12:52

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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
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Would the t series diff bolt straight up, you would need to modify the prop of course.
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I supported Toymods
Location: Perth, WA
Registered: May 2003
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Re: AE86 Diff (Will this work?)
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Tue, 30 March 2004 15:28

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T series bolts up. You need the t18/jdm ae86 tailshaft because it is slightly shorter.
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Location: Perth
Registered: December 2003
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Re: AE86 Diff (Will this work?)
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Tue, 30 March 2004 16:05

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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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I supported Toymods
Location: Perth, WA
Registered: May 2003
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Re: AE86 Diff (Will this work?)
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Tue, 30 March 2004 16:59

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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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Location: Perth
Registered: December 2003
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Re: AE86 Diff (Will this work?)
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Wed, 31 March 2004 15:45

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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
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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?
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Location: Brisbane
Registered: May 2002
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Re: AE86 Diff (Will this work?)
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Wed, 31 March 2004 23:41

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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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Registered: November 2002
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Re: AE86 Diff (Will this work?)
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Thu, 01 April 2004 00:04

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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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I supported Toymods
Location: Perth, WA
Registered: May 2003
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Re: AE86 Diff (Will this work?)
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Thu, 01 April 2004 07:45

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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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Location: Albany WA
Registered: October 2003
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Re: AE86 Diff (Will this work?)
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Thu, 01 April 2004 14:25

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Can the T18 diff be disc braked without trauma? Any ideas?
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I supported Toymods
Location: Perth, WA
Registered: May 2003
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Re: AE86 Diff (Will this work?)
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Thu, 01 April 2004 16:16

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Could be done.
Get some brakes which are bigger than the stock ae86 ones
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Location: Sydney, Australia
Registered: May 2002
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Re: AE86 Diff (Will this work?)
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Thu, 01 April 2004 20:45

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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 
sam
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I supported Toymods
Location: Perth, WA
Registered: May 2003
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Re: AE86 Diff (Will this work?)
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Thu, 01 April 2004 21:54

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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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Location: Albany WA
Registered: October 2003
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Re: AE86 Diff (Will this work?)
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Sat, 03 April 2004 14:36

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ae95 wrote on Fri, 02 April 2004 00:16 | Could be done.
Get some brakes which are bigger than the stock ae86 ones
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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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I supported Toymods
Location: Perth, WA
Registered: May 2003
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Re: AE86 Diff (Will this work?)
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Sun, 04 April 2004 08:43

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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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Location: Albany WA
Registered: October 2003
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Re: AE86 Diff (Will this work?)
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Mon, 05 April 2004 10:12

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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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Location: Albany WA
Registered: October 2003
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Re: AE86 Diff (Will this work?)
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Mon, 12 April 2004 12:49

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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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Banned user
Location: ADELAIDE - The Drift City
Registered: July 2002
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Re: AE86 Diff (Will this work?)
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Mon, 12 April 2004 14:06

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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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Location: Albany WA
Registered: October 2003
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Re: AE86 Diff (Will this work?)
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Mon, 12 April 2004 14:52

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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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Location: Albany WA
Registered: October 2003
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Re: AE86 Diff (Will this work?)
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Mon, 12 April 2004 15:04

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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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Location: Melbourne
Registered: August 2004
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Re: AE86 Diff (Will this work?)
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Fri, 03 June 2005 07:30

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hey look! the search function does work! 
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
i'll continue to search thru the thousands of threads that mention diff in the meantime.
thanks.
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Location: S.E suberbs, Vic
Registered: December 2003
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Re: AE86 Diff (Will this work?)
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Fri, 03 June 2005 15:13
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can someone confirm if the liteace diff gears fit into a t-18 housing?
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