I have a 1983 Mercury Grand Marquis, I guess it's just an AOD transmission.
I've heard people tell me both ways..... so I'll ask here:
Is the "overdrive" truely an overdriven gear? Or is it 3rd with a locked torque converter?
Nic
I have a 1983 Mercury Grand Marquis, I guess it's just an AOD transmission.
I've heard people tell me both ways..... so I'll ask here:
Is the "overdrive" truely an overdriven gear? Or is it 3rd with a locked torque converter?
Nic
The only gear in an automatic transmission is park. They are fluid driven, there are no gears.
transmission.
As cute as you think your answer might be, it has nothing to do with the op's question. Although there may be a "planetary gear set" it is NOT "gears" as the op was inferring..
WHO was the original clown with the "cute" answer ?
The world refers to transmissions (auto or not) as having "1st gear, 2nd gear", etc. Yet, you chose to get semantical and provide zero value to the thread.
The Ford transmission all have a locking converter as well as an overdrive gear, in both their current 4 SP and 5 SP automatics.
mike hunt
Robotnik wrote:
uhhhh...... I might be missing the point..... but I don't think my transmission is "current"
Nic
transmission.
Well, you have made a lot of posts here... you seem to know what you're talking about as far as I can tell. So, I think from now on, I will beleive that my transmission has an overdriven 4th gear ratio without a locking torque converter.
It's too bad we can't assume every once in a while what one is talking about, instead of getting extremely technical on what the webster's meaning of certain words are... such as "gear"....
Thanks, Mr. Moats 8-)
Nic
transmission.
I'm pretty sure that the hydraulics in an automatic transmission actuate clutch packs which act upon gear sets, Sun, Ring and Planetary Carrier. All of which give you different ratios. Different then a manual transmission gear set but gears all the same. To answer the original poster. The AOD 4th gear has a ration of .67. Which is overdrive.
Pat
Thank you, the ratio was more than I needed to know. But thanks anyway. :)
Nic
NO, the AOD is a direct-connect (the converter is bypassed by a long shaft through it) to OD planetary to driveshaft in OD(4th "gear"). The converter is just along for the ride in this mode.
Rob
* * *
Not quite, the converter housing drives the direct clutch giving you 3rd and fully mechanically linked. When you are in 4th there is a 60/40 split of torque,
60 percent of the power flow is thorough the direct clutch the other 40 percent of the power flow is though the turbine of the converter. There is no overdrive planetary, the AOD uses one compound planetary.
I know. I should have added that his does not have the locking converter. I was attempting to covey that it does have OD, but I type fast and only spend a few minutes in any NG. ;)
mike hunt
Thomas Moats wrote:
Your responses are the cutest......smile.. :-)..!
transmission.
Overdrive is truelly overdrive. The output shaft is spinning faster than the input drive. However, what is more important is that the car's engine is spinning more slowly, which reduces wear and tear and gas consumption.
Jeff
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