Longest 01E box?

[philj]

Is the C4Q TDI gearbox (dpj?) the longest ratio'd box available for the b4/c4 platform?

I found a list of 01e ratios the other day and couldn't see any. Been told about MRC's 6th Gear upgrade, but was more hoping for an inhouse off the shelf option from another car?

[UrS4boy]

Is the C4Q TDI gearbox (cpj) the longest ratio'd box available for the b4/c4 platform?

The longest 6th gear for a 01E is 0.56:1 from a diesel box.\

[philj]

Cheers, I'd rather not get involved with taking boces apart if it can be helped, but a google of the cyt gearbox bring an s2 thread with these ratios...

Code letters CYT

Allocation Model: Audi A6 TDI
Engine: 2.5 l - 103 kW

Ratio Final drive 37 : 9 = 4.111
(Z2 : Z1=i) 1st gear 28 : 8 = 3.500
2nd gear 34 : 18 = 1.889
3rd gear 33 : 26 = 1.231
4th gear 27 : 31 = 0.871
5th gear 26 : 39 = 0.667
6th gear 23 : 41 = 0.561
Reverse gear 38 : 11 = 3.455

Speedometer Electronic
Capacity 2.7 litres
Specification Gear oil G 052 911 A SAE 75 W 90 (synthetic oil)
Clutch mechanism Hydraulic
Clutch plate dia. 240 mm
Drive shaft flange dia. 130 mm

Then I found this list.....

GEARBOX
------------
5 Spd.
5 Spd.
6 Spd. 2.2L S6 & 4.2L S6+
6 Spd. RS2
6 Spd S6 4.2L & RS4
6 Spd A6tt - S4tt
6 Spd 2.5L TDI
6 Spd A4 2WD 2001> 1.6L & 2.0L
6 Spd A4 2001> 2.4L & 3.0L V6
6 Spd A4 2001> 1.8T & 1.9TDI
6 Spd A4 2001> 2.5L TDI
6 Spd AllRoad V6tt
6 Spd AllRoad 2.5L TDI RATIOS
----------------------------------
3.50 1.89 1.23 0.93 0.73 CBD
3.50 1.89 1.23 0.93 0.76 CET - European
3.50 1.89 1.32 1.03 0.86 0.73 ** CBM **#
3.50 1.89 1.32 1.03 0.86 0.71 CRB CGR
3.50 1.89 1.32 1.03 0.81 0.68 ** CBN
3.50 1.89 1.32 1.03 0.81 0.68 DSY EDU
3.50 1.89 1.32 0.87 0.67 0.56
3.50 1.89 1.23 1.07 0.73 0.60 FPN FRL 31/8 (3.875) R&P.
3.50 1.89 1.32 1.03 0.86 0.73 FRE 35/8 (4.375) R&P.
3.50 1.89 1.32 0.93 0.73 0.58 FPP FTT 37/9 (4.11) R&P.
3.75 2.05 1.32 1.03 0.71 0.56 ENV FTM 35/9 (3.89) R&P.
3.75 2.05 1.41 1.07 0.86 0.73 See R&P Note below
3.75 2.05 1.23 0.93 0.73 0.60 See R&P Note
** both sets of ratios are listed for S6 V8 6 speeds.
**# DGV listed for A8 1994-> Includes oil pump & wide 1st gear
R&P Note: AllRoad has 35/8 (4.375) - other 01E has 37/9 (4.11)
Most A4 gearboxes have different R&P ratios.


So going by that the a4 2.5tdi for some reason has the longest box with a shorter final drive. Strange they put that in the a4, and the a6 c4 and c5 tdi's gets a short 01e.

[philj]

Then going to ebay finds a 2001 a4 quattro with a completely different code to the above... DQT?

How could I get a list of all the 6 speed quattro boxes with a 3.89 final drive and 0.56 6th?

[UrS4boy]

How could I get a list of all the 6 speed quattro boxes with a 3.89 final drive and 0.56 6th?

You go 3.89:1 and then you have to make sure you also have a 3.89:1 rear diff.

[philj]

Yeah, do B5 A4 diffs fit the C4?

[djh]

if they do, there is a 2.5 v6 quattro a4 rear diff chucked in a hedge on the a1 as i was fed up with it rolling around in the back of the car

[spink]

Yeah, do B5 A4 diffs fit the C4?

Not without plenty of chopping and modding.

An s4/s6 auto rear diff might be suitable.i can't recall the ratio offhand

[philj]

Fair enough, had a quick google for the auto diff ratio but couldn't find it. If not, do C5 diffs fit?

[philj]

Possibly 3.78:1? Would that much of a difference vs 3.89 upset the gearbox?

[UrS4boy]

Possibly 3.78:1? Would that much of a difference vs 3.89 upset the gearbox?

No problem. It would not be upset. It would *just* BLOW UP!!!!

The transaxle final drive crown and pinion ratio and the rear differential crown and pinion ratio have to be EXACTLY the same, not just "close enough"

[philj]

Excellent.

Back to the question of fitting a B5/C5 Diff?

Or maybe the drive into a C4 diff?

Is there anywhere with a more complete list of ratios offered in 01E format?

Are any of the later boxes any weaker at all? Everything else on the C5 seems to be!

Cheers

[UrS4boy]

Is there anywhere with a more complete list of ratios offered in 01E format?

Try this 01E list (mostly 4.11:1 transmissions):

http://12v.org/urs/charlie_smith/01E/index.htm

Oops. This is the source of the info list posted above. Oh well.

[philj]

Yeah that was what I found through google, but I keep finding/getting offered boxes with codes that aren't on the lists.

How many different boxes are there for the C4Q TDI 6 speed?

[UrS4boy]

....How many different boxes are there for the C4Q TDI 6 speed?

As far as I know/can find, the answer is 2 for the 2.5L AEL TDI in a C4:

1. In 1996, the AEL came with a CYT 6 spd with 23/41 (0.56:1) 6th and 37/9 (4.11:1) crown and pinion.

2. In 1997, the AEL came with a DPJ 6 spd with 23/41 (0.56:1) 6th and 37/9 (4.11:1) crown and pinion.

I don't know the differences between a CYT and DPJ.

I did right this post regarding 5 spds vs 6 spds in C4s: http://forums.quattroworld.com/s4s6/msgs/184736.phtml