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Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
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post #1 of (permalink) Old 07-07-2007, 03:49 PM Thread Starter
 
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Auto trany help

Can some one tell me about the system that keep the shifter lock when the engine is off, like in park. Then release the shifter win the engine is runing?. Thanks
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post #2 of (permalink) Old 07-07-2007, 03:54 PM
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It's called a Parking Brake Prawl. There's a parking gear on the output of the transmission that has sever "cut-outs" in it called detents. When the transmission is put in park, there is a lever that is moved to mechanically drop into the detents. This locks the transmission in place.

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post #3 of (permalink) Old 07-07-2007, 04:30 PM Thread Starter
 
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Ya pic's would be great. thanks
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post #4 of (permalink) Old 07-07-2007, 04:46 PM
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Ok... this is from the TF727 Manual....

Last edited by LEVE; 03-24-2009 at 08:43 PM.
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post #5 of (permalink) Old 07-07-2007, 04:47 PM
 
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Quote:
Can some one tell me about the system that keep the shifter lock when the engine is off, like in park. Then release the shifter win the engine is runing?. Thanks
Since you didn't tell us what the problem actually is, we have to makes some educated guesses here...

If I'm reading this correctly, you may be asking about what keeps the shifter it's self locked when you turn the key off.
If so, that particular lock is in the steering column.

What keeps your transmission in any particular 'gear' is called a 'Manual' valve. (Short for Manual Shift Valve)
That Manual Valve engages the Parking Pawl LEVE was talking about when you shift into park.

If you are asking what keeps the vehicle from rolling away, LEVE is dead right about the parking pawl and it's in the back of the transmission case.

If you are having problems keeping your transmission in any particular gear, there is a flat metal spring detent that makes the 'Notches' you feel when you shift through the gears...
If this spring breaks or the roller on the end becomes dislodged, you shifting between gears will become very rough, or you won't have any resistance at all between gears.
----------------

Anyway, explaining the problem in detail is usually the easy way to get an accurate answer here.
There are some really skilled guys when it comes to diagnostics here!
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post #6 of (permalink) Old 07-07-2007, 04:57 PM
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Quote:
If you are having problems keeping your transmission in any particular gear, there is a flat metal spring detent that makes the 'Notches' you feel when you shift through the gears...
One problem on the TF series transmission is that the detent shift plate is "Peened" onto the manual lever assembly. That collar can come loose and cause the shift shaft to spin while the manual lever assembly just sits there. It's being held by the Detent spring andball-bearing.

Last edited by LEVE; 03-24-2009 at 08:43 PM.
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post #7 of (permalink) Old 07-07-2007, 06:44 PM
 
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Amazing what a spot of weld will do right there!
No more difficult to grind the weld off than to get the stake to loosen up if you need to service it...

I used to get a lot of Honda motorcycle shafts in at the shop.
The local repair guy brought them over to have them spot welded...
The first time you dropped the bike on the shifter side...
The 'Crows Foot' would come loose from being pressed on the shaft and you couldn't shift right anymore...
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