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-----Original Message----- From: russw [mailto:russw@classicvw.org] Sent: Friday, September 29, 2006 6:41 PM To: type3@vwtype3.org Subject: RE: [T3] FI Automatic Fastback Stalls in Drive at Stoplights On Fri, 2006-09-29 at 20:18 -0400, Keith Park wrote: > First off, Id start by putting back together the correct matching set of FI > components, the time spent making the mismatched parts work together will > exceed the time spent finding the right ones, and they will probably never > work properly together and could shorten engine life by having the mixture > wrong. Engine life is critical to mixture in our engines. You want a > matched set that match the car, not necessarily the case... the 72 engines > were the same internally as far as what mixture is needed except for the > fact that they had dished pistons originally. Agreed. The AVP case was rebuilt, I chose the 'new heads' option, which means either in intake or exhaust valves are 1 mm different from the original heads. AVP claimed customers didn't see a significant difference in reliability, and my decision to go with new heads was one of reliability over slight difference in performance - (I'm hoping thats all 1mm diff would do) The 69 distributor was swapped in when I suspected the 70 distributor shaft was worn due to the timing hunting. However I also replaced the trigger points at that time so I'm not sure if I verified the 70 distributor was shot. I will reinstall the proper distributor with the new tune up parts and trigger points, but also keep my eye open for an aftermarket replacement if available or a source to rebuild it. > > Correct me if Im wrong but wouldn't a T4 tranny be a very incorrect match > for the T3 engine since the T4 engine has so much more Torque and some had > more HP? I would think the shift points would be all wrong and probably the > axle ratio too.... I know the Manuals are not swappable with ease, this isn't the case with the > autos? > > Keith T-4 automatic's had a lower differential ratio. This will throw off the shift points. The govenor is driven by the differential. Also, if the timing isnt right, the manifold vacuum won't be right. -- russw <russw@classicvw.org> Thanks, When I bought the vehicle my vw background was strictly manual trans. The PO sensed my nervousness about automatics and threw in the 'extra spare' so to him this spare is actually a type 3 transmission. I assumed this replacement was a type 4 transmission for two reasons. The part number was the same but the letter prefix differed, both transmissions have the number 003 321 105, the original transmission has an "E" code after the part number, while the spare has a different letter (A, B or D). The second reason is that the original had axle flanges with a 3.75" diameter (the CV Joint), while the spare transmission only accepts a 4" diameter cv joint. One of the manuals indicated that these transmissions were swappable, as long as you transferred the axle flanges on the transmission. I took them off the original and installed them on the spare, and the CV joints were able to mate. My assumption that this spare is a type 4 was based on the fact that the diameter was increased to accomodate the higher torque/horsepower requirements of the type 4. I don't know this is a type 4 for a fact. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~