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T3di 
Vanorak
Joined: 23 Aug 05
Location: Sheffield
Status: Offline
Points: 3099
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 Topic: gearbox-is this the solution??
Posted: 16 Jan 07 at 09:07 |
A well known german company have gone ebayable.
I've found this,(is this the ring and pinion(?)-that ups all the gearing?)
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ih=001&a mp;sspagename=STRK%3AMEWA%3AIT&viewitem=&item=110051 886882&rd=1&rd=1
I emailed the guy,who said it drops revs by 200,is that all/enough??-or was his english a bit dodge?
Seems fairly affordable,although I realise its a strip down thats the costly bit....
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monsho
Admin Group
Joined: 08 Oct 04
Location: Newcastle
Status: Offline
Points: 3510
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Posted: 16 Jan 07 at 13:47 |
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thats a new top gear yeah, not final drive.....should def drop the revs down a
bit, but it all depends on which gearbox you have....5th gear in a 9d diesel
box is the same .77:1 ratio....
would be good in an AAP or AAR, which has the low final drive as well...
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T3di
Vanorak
Joined: 23 Aug 05
Location: Sheffield
Status: Offline
Points: 3099
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Posted: 16 Jan 07 at 18:13 |
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ah er those gearbox codes sound familiar.
So I'd still benefit from a new ring and onion thingy then too,but how much are those bad boys?-typically, these guys don't sell those too!
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T3di
Vanorak
Joined: 23 Aug 05
Location: Sheffield
Status: Offline
Points: 3099
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Posted: 18 Jan 07 at 16:28 |
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right got me head round this idea a bit better now I think anyway.
I need to go for a 29:7 ring&pinion,plus that tall 5th,will give me
@2000rpm-47mph instead of 40
@3000rpm-70mph instead of 60
@3500rpm-82mph instead of 70
Its still tricky trying to get me head round the prices though.
Those 2 gear parts come to around £630,without getting the box overhauled!
Although I've seen a couple of companys on ebay.de offering overhauled JX boxes with an even lower 5th!!(0.74 instead of 0.78),for a similar price.hmmm
Anyone recommend a geabox man in the North?
Edited by syncrot4
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cunning plan
Vanorak
Prince of The Darkness
Joined: 13 Sep 04
Location: England
Status: Offline
Points: 2156
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Posted: 18 Jan 07 at 17:44 |
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what gearbox do you have already?
4 speed petrol boxes FOR THE WIN!!!111
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Im not a forum anorack, im just at work ;)
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T3di
Vanorak
Joined: 23 Aug 05
Location: Sheffield
Status: Offline
Points: 3099
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Posted: 18 Jan 07 at 18:34 |
i fink its an aap at the mo,can't remember. 
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T3di
Vanorak
Joined: 23 Aug 05
Location: Sheffield
Status: Offline
Points: 3099
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Posted: 19 Jan 07 at 09:54 |
Ha haa,the plot thickens,twists and turns. According to a nice friendly German gearbox builder my idea of the 29:7(4.14) diff plus 0.78 is "too much for the TDi" in his words.He says it needs to be just the 0.78 gear if its a box with the 4.57 diiff(AAP). Well the thought of saving £450 there is nice but it's hard to get a definite agreed bottom line on gearing.
Edited by syncrot4
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gin23deluxe
Groupie
Joined: 15 May 06
Location: United Kingdom
Status: Offline
Points: 51
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Posted: 19 Jan 07 at 16:19 |
hi synrot4 i am tryin to squeeze a bit more out of my 1.6td, gearbox s are an option i am lookin at mines the standard 5 speed, plus some other mods cant be doin with the agro with the tdi...Or aaz.
who s the german gearbox guy do u have any details
cheers mark
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T3di
Vanorak
Joined: 23 Aug 05
Location: Sheffield
Status: Offline
Points: 3099
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Posted: 19 Jan 07 at 16:55 |
sure.He's been quite helpful considering I've been bothering him a bit off topic from his ebay ad. type in this item number on ebay 110078618199 to find the JX box he's advertising. 
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Full Throttle
Vanorak
Joined: 08 Jun 05
Location: England
Status: Offline
Points: 1829
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Posted: 19 Jan 07 at 22:31 |
If you have the 4.57 (32/7) then the 0.78 or 0.77 would make sense as the 0.70 i fitted is slightly to tall. The only problem with this is you will need a new third gear ratio as well.
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T3di
Vanorak
Joined: 23 Aug 05
Location: Sheffield
Status: Offline
Points: 3099
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Posted: 20 Jan 07 at 09:39 |
Hi Nigel, well they do have a JX box with a 0.74 5th but he's finally got cheesed off with tommy's qvestionz No reply through email any longer  What are your thoughts on 0.74 5th,and will a 3rd gear replace be necessary anyway? cheers
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Full Throttle
Vanorak
Joined: 08 Jun 05
Location: England
Status: Offline
Points: 1829
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Posted: 24 Jan 07 at 21:48 |
I cant comment on the JX engine and gearbox combination as i have never done it.
There really is'nt a T3 standard gearbox good enough for the tdi, i drove mine around for a while with the DT code box as standard and it was revving its nuts off/noise etc and the DT is one of the higher ratio box.
Gear ratio's are tricky to decide on, should be able to help you decide as you have the 1z as well. Whats your gearbox code. ?
The good news is that the gears in my DT gearbox will fit straight into the syncro AHF gearbox.
So i suspect that a lot of the standard gears on standard box's are interchangeable as long as they are the same type 091, 091/1 etc. Some of the gearbox's have good ratio gears that you maybe able to use, mix and match. Might be cheaper than buying new gears for 220.00 squids a shot in the uk. obviously you would need this checking out first.
Best bet is to find a good 4.57 (32/7) final drive (ring and pinion) ratio and work from there.
Edited by Full Throttle
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Tim Hamnett
Yardie
Joined: 11 Nov 05
Location: sitting down
Status: Offline
Points: 853
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Posted: 24 Jan 07 at 23:41 |
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Anyone know what ratios the S.A. box's use.
I still cant get my head round how low t3s are geared as standard.
I run a jx with what's described as the long aap box and it still feels low geared. Maybe it would run out of steam with anything higher but it feels like its got loads of go left in it in fifth. Maybe its the noise that does my head in.
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T3di
Vanorak
Joined: 23 Aug 05
Location: Sheffield
Status: Offline
Points: 3099
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Posted: 25 Jan 07 at 07:55 |
 Full Throttle wrote:
. Whats your gearbox code. ?
Best bet is to find a good 4.57 (32/7) final drive (ring and pinion) ratio and work from there.
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I thought it was AAp/ASL from when Simon looked undeneath,just checked the sticker under the dash,it says ASL(4.57),there's a slight chance its a different box on there,I'll have a proper look when I'm putting my new power steering pipe back on,frozen fingers permitting
Whats the general concensus on increasing tyre/wheel size instead,or at least short term?Just a thought as my speedo's in kph already so I have to convert "true" mph on it anyway.Like a set of 17's in the shed that you just fit before a big France trip or something?mind you that works out about the same price as getting the box done I spose
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Full Throttle
Vanorak
Joined: 08 Jun 05
Location: England
Status: Offline
Points: 1829
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Posted: 26 Jan 07 at 12:35 |
What tire size / rim size do you have at moment and what tire size / rim size do you want to go to.
Then we can work out how many revs it will drop in any given gear for your gearbox and in theory your top speed.
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T3di
Vanorak
Joined: 23 Aug 05
Location: Sheffield
Status: Offline
Points: 3099
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Posted: 26 Jan 07 at 16:03 |
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205/70 14 standard multivan alloys
Anything bigger than 17 is too big for me,I think
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Full Throttle
Vanorak
Joined: 08 Jun 05
Location: England
Status: Offline
Points: 1829
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Posted: 27 Jan 07 at 01:18 |
Whats your e-mail address, easier to send spreadsheet with all the info than try and explain it all on this page.
But basically.
your tire size
| 1st number |
2nd number |
3rd number (after "R") |
Tire diameter (in inches) |
| 205 |
70 |
14 |
25.30 |
Your AAP gears max speed at 4000 RPM
| RPM |
Tire diameter |
1st gear ratio |
Ring & Pinion ratio |
Overall gear ratio |
MPH |
| 4000 |
25.3 |
4.11 |
4.57 |
18.78 |
16.03553 |
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2nd gear ratio |
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| 4000 |
25.3 |
2.33 |
4.57 |
10.65 |
28.28584 |
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3rd gear ratio |
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| 4000 |
25.3 |
1.48 |
4.57 |
6.76 |
44.53109 |
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4th gear ratio |
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| 4000 |
25.3 |
1.02 |
4.57 |
4.66 |
64.61374 |
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5th gear ratio |
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| 4000 |
25.3 |
0.82 |
4.57 |
3.75 |
80.37319 |
RPM difference after shifting in this case from fourth to fifth
| RPM before shift |
ratio shifted from |
ratio shifted into |
RPM after shift |
RPM Gain or Loss |
| 4000 |
1.02 |
0.82 |
3215.686275 |
784.3137255 |
In other words you drop 784 revs just by changing into 5th gear.
So all we need now is the new tire size and we can then work out the RPM drop by just using the new tires and your new theoretical top speed at 4000RPM.
I dont take any credit for this info it came from another site and i lost the link to it.
Edited by Full Throttle
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T3di
Vanorak
Joined: 23 Aug 05
Location: Sheffield
Status: Offline
Points: 3099
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Posted: 27 Jan 07 at 08:43 |
cheers Nigel,I sort of get it. my email is lowpressure@hotmail.com  G60 steve's got a nice set of 16's that are tempting me....
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Full Throttle
Vanorak
Joined: 08 Jun 05
Location: England
Status: Offline
Points: 1829
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Posted: 27 Jan 07 at 17:45 |
Had a quick look at the figures and your gearbox looks like it is stock.
your were doing similiar amount of revs and speeds you once said, compared to mine.
Which would be about right as i am running 185/60/14 rims and tires.My top speed with them on is 84mph at 4000rpm with a 0.70 ratio.
If i changed my tires for the Carat ones 205/70/14 then my theoretical top speed would be 94 MPH.
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pearce
Groupie
Joined: 28 Feb 06
Location: United Kingdom
Status: Offline
Points: 244
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Posted: 29 Jan 07 at 19:22 |
Hi guys,i've been reading this topic as i'm just getting all the bits together for my tdi conversion,and as you have been saying the gearbox is a major part in it.The gearbox i have gone for is the early 2.0 aircooled box,code DK.
The diff ratio is 4.57.I'm not looking for all out speed but to cruise along at 70 with the engine's revs at a desent level(Not 4,500 ) would be nice.
I'm going to keep the standard size wheels 'n' tyres,is it best i change the fourth gear?(currently 0,823) and would i need to do the third gear too.
Cheers Gary
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I try to keep smiling even when asleep.
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gearbox-is this the solution??