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Unread 04-20-2014, 11:29 AM   #1
TGleason
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Default Transmission Problems?

I've been having some problems with my transmission, and for the life of me, I cannot figure out what is wrong. A couple weeks ago I noticed my rpms were unusually high. I was going 55 mph on cruise control and my rpms were at 2000. A .7:1 transmission ratio, a 3.73:1 axle ratio, and 35" tires at 2000 rpm i should be going about 80 mph. What gives? I thought my transmission wasn't shifting into 4th, (OD in the A340E) which would make sense, the rpm and speed match up, but I counted the shifts as well as shifted manually, it's in 4th. Could it be the clutches slipping? Maybe a TC problem? I do have 190,000 miles so anything is possible. It may be reaching the end of its life and may be needing a rebuild soon.

Happy Easter to all and thanks for your replys.
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Unread 04-20-2014, 12:59 PM   #2
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DO you have a V6 with 4 spd ? Looks like it just want to verify.

It could be that the TQ converter is not locking up at highway speed, 55MPH on the V6 with 4 spd may a be a bit low for it to lock up, especially on a slight incline. Try going on a slight downhill at 65 or so and see what RPM it is up vs level ground at the same speed, and then a slight incline.

Also keep in mind the speedo does only measure wheel rotation speed it doesn't account for the larger tires.

BTW the axle ration stock for the v6 4spd was 3.91:1 or close to that. Only the 5spd had 3.73:1.
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Unread 04-20-2014, 01:16 PM   #3
TGleason
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I do have the V6 4 speed. I have a speedohealer so my speedometer is right on. And even with a 3.9:1 ratio my rpms are too high. I'll go out later and try higher speeds and see what happens.
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Unread 04-20-2014, 10:57 PM   #4
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Also useful info is when did i start and what changed form when it was normal till this behavior.

When last was the ATF fluid flushed?
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Unread 04-21-2014, 06:47 PM   #5
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Ok so I drove around at about 60 mph and my rpms seem to be right on. So my TC must not be locking up, right? If that's right why is it just a within these past couple weeks that it's doing it? Could it be, and I may be jumping to conclusions, that the engine is reaching the end of its life and losing power not allowing the torque converter to lock up?
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Unread 04-21-2014, 09:23 PM   #6
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Your first post you indicate that the problem is your rpms are too high, now you state they are right on, so no problem, right?
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Unread 04-21-2014, 09:55 PM   #7
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The v6 with 4spd auto is starved for TQ with 35" tires and stock gears. So at lower speeds the engine speed, TQ and engine laod will make the ECU not lock the TC. I would say it is pretty normal given your setup. 35" heavy tires do take it's toll, especially at lower RPMs on the v6. Solution is to drive faster it seems or regear
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