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On 8 Jun 2001, at 19:47, Tom Hansen wrote: > There are a few other differences. The T3 had a 3.67 final drive while the > T4 had a 3.73 for the fasty and a 3.91 for the SB. There was also the speed > or gear (?) output to the brain of the T4. Both used a pressure switch on one of the pressure test points to indicate switching into high gear. This did not go to the FI brain, but rather to a complicated arrangement of relays related to the vacuum advance and the EGR. At least on type 3s this was limited to 72-3 AT cars with EGR, I think. It's really not a transmission difference, just the replacement of a threaded plug with a pressure switch for certain other options in certain years. - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe