Originally Posted by
onemoremile
Looks like I was wrong. The only odd one is the B5 S4. The 2004 A4 didn't have gear ratios shown so I had to use the 2006 A4 3.2 FSI.
Good info. Here is another little chart I put together a little while ago, while on the search for better gearing. My conclusion, after speaking to SEVERAL people who've run different transmissions with the 2.7T and kept breaking them because the gearshafts simply couldn't take stage 3 power, was too just keep the stock S4 transmission and go with a JHM rebuild (mine had failed synchos).
I heard great things about the allroad tranmission, as the housing featured fittings for an external oil cooler, audi used it from the factory with their 4.2 and 2.7t motor, it seemed like a great option. Although upon looking at the gearing ratios and tremendous price (~3g's!!!), I quickly strayed away as it would not only yield lower speeds at the top of each gear but I would still be buying a used tranny not really knowing the condition of the synchos.
Next I thought about using a B6 A4 3.0 transmission, as I noticed it had the same ratios as the RS4 tranny and could be had at a fraction of the cost. At the time I found one for about $1,000 in good working condition. This seemed like a great route as well, especially after finding out that 1-4 gear ratios were the same as RS4 and would give me just enough to shift and get going into 4th before going through the trap. But then I contacted Stasis, where I was informed that although the ratios may be the same the gears themselves were weaker than the B5 S4 gears and I would more likely than not, break them with enough abuse and power that a stage 3 car could put. This really explained to me why one particular friend who has tried numerous transmissions in his car kept breaking them time after time. Its was not the driving, but the transmissions themselves. It was also noted that most of the A4 transmissions had the same shafts and gears, which all would eventually fail stage 3 power, the only exception was the B5 A4 2.8 transmission, which would be the strongest of all the A4 transmissions and give the best ratios, although it would be a 5 speed, a bitch to drive on the highway yielding terrible fuel economy, but still not stronger than a B5 S4 transmission.
At about that time, I saw Jay was in the process of having gears made, although again the price they were being offered IMO would not justify the gains, considering I would still have to rebuild my tranny as the synchros had failed. For me, in the end I did my homework and decided the cost-benefit of any other options would not justify the gains and possibility of having another broken tranny so I just went with a standard JHM rebuild kit and kept the ratios I had.
Maciek, for you, if you plan on sticking with the 1.8t and depending upon how much power you are planning to make, if you are seeking a 6 speed it may be worth just snagging a B6 A4 3.0L 6speed tranny and using that, although based upon the discussions I've had with others and the outcomes we've seen with the experimentation of different transmissions other than the B5 S4 6speed with the 2.7t platform, I'd say the B5 S4 transmission is the most bullet proof option out there. As far as the B5 S4 trannies are concerned, it should definitely be noted that the 01.5-02 synchos were updated and will be less prone to failure over the 00-01 revisions. Otherwise, make sure to do your homework.
p.s. - Coming from a B5 S4 standpoint with a 4.111:1 final drive and matching rear diff to any of the transmissions mentioned, the only one that is completely plug and play would be the B6 A4 3.0L 6speed and ofcourse a true B5 RS4 tranny, which we will almost never see here in the states. The Allroad transmission will require an allroad rear differential and the B5 A4 2.8L 5speed transmission will also require a matching a rear diff, axles, and spindle.
*** If anyone has any other findings, experiences running any other transmission on their car other than the one intended for use, please do share your findings.
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