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post #1 of 7 (permalink) Old 12-06-2003, 08:09 AM Thread Starter
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how electronic is the 4R70W?

sorry, but i dont--and probably will never--understand how every part of an automatic transmission works.
my question is, when you physically move the shifter from Park to Drive, what is the shifter actually doing? is it doing something physical inside the tranny, or is it just making electrical contacts that cause things to happen like a TV remote?
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post #2 of 7 (permalink) Old 12-06-2003, 08:35 AM
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the shifter moves the manual lever position sensor (MLPS). That tells the EEC what you want to do, and the EEC then tells the trans what to do.




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post #3 of 7 (permalink) Old 12-07-2003, 03:26 PM
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Yes, in addition to moving the MLPS, as GreenBird stated, it is also connected directly to a hydraulic valve inside the transmission's valve body by a cable. The transmission is shifted via the EEC with 2 on/off solenoids, so a total of 4 different combinations are yielded for the 4 gears. Line pressure is regulated by the EEC via a solenoid. Also, you asked about "from park to drive"...I have seen a BMW with an electric parking mechanism, but in our cars, it is still done the old-skool way, with a mechanical parking mechanism connected to the shifter via mechanical linkage.
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post #4 of 7 (permalink) Old 12-08-2003, 07:22 AM
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Chili, when you open it up for the mod (when we doin that anyway?), all of ^ this, will make perfect sense. Trust me.

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soon to install : "fixed" heads and a damn tune. Project snaked8 continues...
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post #5 of 7 (permalink) Old 12-08-2003, 07:24 AM Thread Starter
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Quote:
Originally posted by Fubarian
Chili, when you open it up for the mod (when we doin that anyway?), all of ^ this, will make perfect sense. Trust me.
yeah, because of school we couldnt get to it this fall. now it's to cold to make you help me because i really doubt i can find a garage--unless you think a couple space heaters could warm up a garage.
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post #6 of 7 (permalink) Old 12-08-2003, 05:56 PM
 
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My kerosene heater did it just fine, but it was a small garage...

Now i just need a helper, the tools, and the parts :/
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post #7 of 7 (permalink) Old 12-08-2003, 06:54 PM
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Quote:
Originally posted by chilipepprflea
yeah, because of school we couldnt get to it this fall. now it's to cold to make you help me because i really doubt i can find a garage--unless you think a couple space heaters could warm up a garage.
gimme a call or catch me online, we'll see if we can't work something out -- shouldn't be too hard.

96 Mark VIII [email protected] :: 03 radiator/fan - j-modded trans - BBK UD pulley kit - dual gauge pod - 28,000 B&M transcooler (w/ AN fits) - 3.73 locker (with speedo gear) - 180' thermo - 8.5mm wires - colder plugs
soon to install : "fixed" heads and a damn tune. Project snaked8 continues...
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