Author Topic: 727 SB almost no resistance shifting from gear to gear.  (Read 2987 times)

Offline Mark8117

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727 SB almost no resistance shifting from gear to gear.
« on: June 06, 2015 - 01:08:05 PM »
Ok gang need some insight.

When I take the car out of park going to Drive, the tranny does not click as it goes past Rev or Neutral.  I can freely move the shifter back and forth.  When I find drive car shifts normal.  And I can get into park.  I checked the linkage and that all seems good.  It appears it is at the tranny.  Brackets are not stripped and everything is snug on the outside of a casing.

What could this be?  Am I looking at a rebuild?

Thanks




Offline Chryco Psycho

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Re: 727 SB almost no resistance shifting from gear to gear.
« Reply #1 on: June 06, 2015 - 05:21:33 PM »
Floor or column shift ?
 could just be a detent spring in the shifter

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Offline 1 Wild R/T

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Re: 727 SB almost no resistance shifting from gear to gear.
« Reply #2 on: June 06, 2015 - 05:55:09 PM »
Floor or column shift ?
 could just be a detent spring in the shifter

Or the detent spring on the valve body...
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Offline Mark8117

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Re: 727 SB almost no resistance shifting from gear to gear.
« Reply #3 on: June 06, 2015 - 06:57:52 PM »
It's a column shift.

I got under the car and if I move the lever on the trans its self it is free moving there no solid click like it should be

If it is a detent spring in the valve body can I change that with the tranny in the car?

Offline 734406pk

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Re: 727 SB almost no resistance shifting from gear to gear.
« Reply #4 on: June 06, 2015 - 10:05:55 PM »
It's a column shift.

I got under the car and if I move the lever on the trans its self it is free moving there no solid click like it should be

If it is a detent spring in the valve body can I change that with the tranny in the car?
There are 2 levers on the transmission, the selector lever (bottom) and the throttle lever (top). Make sure your checking the right one. The bottom lever.
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Offline burdar

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Re: 727 SB almost no resistance shifting from gear to gear.
« Reply #5 on: June 06, 2015 - 10:25:50 PM »
Your probably missing the large detent ball on the valve body. Drop the pan and the valve body. You'll see the detents on the manual lever. There is a stiff spring that pushes the ball against the lever. Both are probably missing.

To reinstall the spring and ball, you need to hold them in place with a plastic tie strap. Then push down on the manual lever. The lever will push the tie strap down and out of the way.  The ball will snap into place in one of the detents. Kind of hard to explain but you'll see what I mean when you look at it.
« Last Edit: June 06, 2015 - 10:32:41 PM by burdar »

Offline Mark8117

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Re: 727 SB almost no resistance shifting from gear to gear.
« Reply #6 on: June 06, 2015 - 10:29:12 PM »
Yes I am checking the bottom lever.

Would the ball just drop out on its own? 

Should I put in a. Shift kit at this time?

Offline Chryco Psycho

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Re: 727 SB almost no resistance shifting from gear to gear.
« Reply #7 on: June 06, 2015 - 10:31:52 PM »
Not a problem to drop the valve body out , you could install a shift kit at the same time .
 A detent ball should not drop out but could be sticking

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Offline burdar

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Re: 727 SB almost no resistance shifting from gear to gear.
« Reply #8 on: June 06, 2015 - 10:37:38 PM »
I don't remember, is there a small retainer on the top of the manual lever that holds it down? I think there is. If that retainer is missing, the lever could have lifted up and the ball/spring could have pushed out. That spring is pretty stiff. I don't think the ball is sticking.

Offline 1 Wild R/T

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Re: 727 SB almost no resistance shifting from gear to gear.
« Reply #9 on: June 06, 2015 - 11:24:29 PM »
I don't remember, is there a small retainer on the top of the manual lever that holds it down? I think there is. If that retainer is missing, the lever could have lifted up and the ball/spring could have pushed out. That spring is pretty stiff. I don't think the ball is sticking.

I agree it's hard to imagine the detent ball sticking... The shift shaft with comb is inserted in the valve body then the kick down lever is inserted.. Next an E clip locks the kick down lever in position & the kick down lever traps the shift lever... If the E clip is missing things could move...

I like the zip tie idea, I've always cussed the spring & ball into position... :smilielol:
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Offline burdar

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Re: 727 SB almost no resistance shifting from gear to gear.
« Reply #10 on: June 07, 2015 - 12:59:46 PM »
I think the zip tie idea is listed in the TransGo instructions.

Offline 1 Wild R/T

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Re: 727 SB almost no resistance shifting from gear to gear.
« Reply #11 on: June 07, 2015 - 09:02:26 PM »
I think the zip tie idea is listed in the TransGo instructions.

Last TransGo kit I installed was probably 1978... I don't know if zip ties even existed then...  Ok, inverted in 58, current design showed up around 68... But they were marketed mostly to aircraft & military... Honestly I don't recall seeing zip ties till the mid 80's  And I spent the late 70's in the Military... Remember getting zip ties from the parts dept at work, they would only give you two or three at a time... Like the things were gold or something... Hardware stores would sell them in packages of 10-25.. Now it's packs of 50-1000...
JS27N0B 70 Challenger R/T Convertible  FJ5 Sublime, Show Poodle w/90,000 miles since resto
WS27L8G 68 Coronet R/T Convertible  PP1 Bright Red, Project
RM21H9E 69 Road Runner Coupe R4 Performance Red, Sold...
5H21C  65 Falcon 2 dr Wagon... Dog Hauler...

Offline Mark8117

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Re: 727 SB almost no resistance shifting from gear to gear.
« Reply #12 on: July 01, 2015 - 08:47:14 PM »
It was the ball bearing that runs against the comb.  Over the years the post that the comb swivels on has gotten a little loose, so instead of putting the bearing back on and it happening down the road.  I found a guy selling a bullet looking type that replaces the bearing and the body of the bullet sits back further in the housing.  Fits great and works perfect.  We are back on the road.

Thanks for all the help :worshippy

Offline Chryco Psycho

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Re: 727 SB almost no resistance shifting from gear to gear.
« Reply #13 on: July 01, 2015 - 09:58:23 PM »
Glad you got it sorted out  :2thumbs:

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