727 shifting too quick???

Posted By: BFASTER

727 shifting too quick??? - 07/22/09 01:52 AM

I have a 727 of unknown vintage(older I think) and it seems to me that under normal acceleration that it shifts from 1st to 2nd to 3rd really quick.

So quick that when I first started to drive my car I thought it was stuck in 2nd. I had to listen really hard to hear it change into 3rd. I had it rebuilt some 4 years ago with no mods; it has a "stock" MP torque converter and is hooked to a 3:55 rear gear. So what gives?

Posted By: dOoC

Re: 727 shifting too quick??? - 07/22/09 02:01 AM

At what speed is the trans shifting gears? .. throttle linkage adjusted properly ?

Posted By: MoparforLife

Re: 727 shifting too quick??? - 07/22/09 02:18 AM

under normal accelleration shift should be 1/2 @ 18
2/3 @ 28.
Where is your throttle pressure linkage set and do youhae teh small spring holding the rear of the slot to the carb throttle pin so that you have constant progressive throttle pressure. This is what regulates the shift points.

Posted By: BFASTER

Re: 727 shifting too quick??? - 07/22/09 02:28 AM

Quote:

At what speed is the trans shifting gears? .. throttle linkage adjusted properly ?

It shifts at very low speeds-I can be in 3rd before I hit 25mph! As far as linkage goes, it should be OK. Everything else related to the carb is fine. Or did you mean the kickdown linkage?

Posted By: BFASTER

Re: 727 shifting too quick??? - 07/22/09 02:30 AM

Quote:

under normal accelleration shift should be 1/2 @ 18
2/3 @ 28.
Where is your throttle pressure linkage set and do youhae teh small spring holding the rear of the slot to the carb throttle pin so that you have constant progressive throttle pressure. This is what regulates the shift points.

I will check out that throttle pin.

Posted By: dOoC

Re: 727 shifting too quick??? - 07/22/09 02:34 AM

At light throttle... into 3rd by 25mph isn't bad. But under heavy throttle or WOT .. not good.

TP linkage same/same as KD linkage.

Posted By: DaytonaTurbo

Re: 727 shifting too quick??? - 07/22/09 02:36 AM

Quote:

It shifts at very low speeds-I can be in 3rd before I hit 25mph!

Normal. My 727 putters around at 1500rpm @ 30mph. Why do you think you'd need to wind it out any higher? Even my 4cyl 2.5 TBI with a 3sp torqflite fwd trans shifted at around those same speeds. So long as it downshifts when you nail the throttle it's fine. Also when I go full throttle mine winds itself out to 5000 before it shifts on its own.

Posted By: Anonymous

Re: 727 shifting too quick??? - 07/22/09 04:25 AM

My car shifted exactly like that till a week ago when I re adjusted it. Check out this link. Go to 1971 car and linkage adjustment. I think mine is close to 1/2 play at the rod now. A few tuns of the rod change the shifting of the tranny when you are close. A few trips down the road and you will have it how you want. Kick down in my car now works too.

http://www.imperialclub.com/Repair/Lit/Master/index.htm

Posted By: BFASTER

Re: 727 shifting too quick??? - 07/22/09 06:03 AM

Comment edited: uncalled for and triggered the downward spiral of this thread

Posted By: BFASTER

Re: 727 shifting too quick??? - 07/22/09 06:06 AM

Irrelevant to post, try to stick to the topic at hand please. Thanks!

Posted By: 74Scamp

Re: 727 shifting too quick??? - 07/22/09 01:38 PM

Quote:

Quote:

It shifts at very low speeds-I can be in 3rd before I hit 25mph!

Normal. My 727 putters around at 1500rpm @ 30mph. Why do you think you'd need to wind it out any higher? Even my 4cyl 2.5 TBI with a 3sp torqflite fwd trans shifted at around those same speeds. So long as it downshifts when you nail the throttle it's fine. Also when I go full throttle mine winds itself out to 5000 before it shifts on its own.

Ummm, not to try and start something here, but I think what DaytonaTurbo was saying is "Why do you think "you would" need to wind . . . ." "You'd" is "short" for You Would.

Posted By: Junky

Re: 727 shifting too quick??? - 07/22/09 02:08 PM

Irrelevant to post, try to stick to the topic at hand please. Thanks!

Posted By: StealthWedge67

Re: 727 shifting too quick??? - 07/22/09 02:40 PM

(Irrelevant to post, try to stick to the topic at hand please. Thanks! )

He's right, into 3rd at about 25 mph about correct under light accelleration.

Posted By: John_Kunkel

Re: 727 shifting too quick??? - 07/22/09 08:04 PM

Quote:

It shifts at very low speeds-I can be in 3rd before I hit 25mph!

The factory spec for the 2-3 shift is under 20 mph so yours is actually shifting late.

Posted By: DaytonaTurbo

Re: 727 shifting too quick??? - 07/22/09 09:05 PM

Irrelevant to post, try to stick to the topic at hand please. Thanks!

Posted By: BFASTER

Re: 727 shifting too quick??? - 07/23/09 12:07 AM

Irrelevant to post, try to stick to the topic at hand please. Thanks!

Posted By: BFASTER

Re: 727 shifting too quick??? - 07/23/09 12:09 AM

Irrelevant to post, try to stick to the topic at hand please. Thanks!

Posted By: Dougsmopars

Re: 727 shifting too quick??? - 07/23/09 12:16 AM

shifting into 3 by 25 sounds about right but not feeling it [Edited by Moparts - Family Friendly Site - Keep it clean] sounds like a problem. Check the adjustment on your kickdown. It controls trans presure.

Posted By: steeters

Re: 727 shifting too quick??? - 07/25/09 04:00 PM

If I can hijack this for a moment...
I too am experiencing an issue with a shift point that I believe is too early. It is a rebuilt, zero miles, Torque Command (AMC) 727 with a transgo shift kit.
I have what resembles the Mopart multi-segment throttle pressure linkage.
There's is about 1/3" of slack in the carburetor link bar before the throttle will start pulling forward on the throttle rod.
I got this much slack by pulling all the way forward on the throttle rod, and opening the carburetor linkage to full throttle and tightening down the nut on the carburetor link bar.
Since the shift seems too early to me, can I just add a little more slack in the carburetor link bar so that maybe 3/4" of throttle travel will occur before pulling forward on the throttle rod?

Thanks!

Steve

Posted By: John_Kunkel

Re: 727 shifting too quick??? - 07/25/09 08:46 PM

You say the carb "pulls" the throttle rod?

Mopars push the linkage, and the back of the carb stud must remain in constant contact with the rear of the slot on the top rod.

However your linkage is configured, to get later shifts you want the transmission lever further to the rear for any given throttle opening.

Posted By: steeters

Re: 727 shifting too quick??? - 07/26/09 12:48 AM

Thanks John,

I think we were meaning the same thing when you said 'push' and I said 'pull.' If that's the case, should I remove any slack from the throttle rod...for example, the moment I give the gas pedal a push down - the throttle rod should immediately follow the carb linkage?
Is it okay (necessary even) for the transmission lever to be under some tension, even at rest? Or, should it be under no tension until the gas pedal has traveled 1/4 of it's way to the floor?

Thanks again,

Steve

Quote:

You say the carb "pulls" the throttle rod?

Mopars push the linkage, and the back of the carb stud must remain in constant contact with the rear of the slot on the top rod.

However your linkage is configured, to get later shifts you want the transmission lever further to the rear for any given throttle opening.

Posted By: BFASTER

Re: 727 shifting too quick??? - 07/26/09 04:01 AM

Quote:

shifting into 3 by 25 sounds about right but not feeling it [Edited by Moparts - Family Friendly Site - Keep it clean] sounds like a problem. Check the adjustment on your kickdown. It controls trans presure.

I checked and it seems a little loose. I have a Lokar KD and it was installed by my mechanic. (Yeah, I don't do much of the mechanical work on my own car) Anyway, when I manually 'advance' the throttle, the KD cable makes the KD lever move; I can hear it. So maybe I started this whole post for nothing. I apologize to anyone I've offended.