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4R70W hard 1-2 shift (already replaced accumulator springs and piston) #5389453 03/30/20 01:29 PM
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jbar430 Offline OP
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I have a 2000 Ford Mustang equipped with the 3.8L motor and an automatic transmission. The car has ~250K miles on it and both the engine and trans are original and neither has been rebuilt. The car runs great except for a harsh 1-2 shift. A while back I was driving it and the car felt like it slipped going from first to second. Ever since then it has had a hard shift going from first to second. All other gear changes are smooth. The car shifts hard enough going from first to second that it will chirp the tires if I'm over ~50% throttle. If I baby the throttle the shift isn't as hard but it is still clunky.

All of my internet research led me to believe I had a broken 1-2 accumulator spring. I dropped the pan and removed the 1-2 accumulator piston only to find two intact springs and a healthy looking piston. Since I was already in there and had the parts on hand, I replaced the piston, cover, and both springs. The kit I got from CT Powertrain had a purple lower spring and a white upper spring. After I got everything back together I went on a ~30 mile test drive and the car still shifts hard going from 1-2 with no other shifting issues. If I manually force the car to shift from 1-2 using the gear selector the shift is much smoother. I looked at the output of the TPS and MAF using a scan tool and they seem to be working as intended. I even cleaned the MAF to be sure. The trans fluid is Motorcraft Mercon V and is filled to the appropriate level. I'm at a loss on what to do next, any ideas?

Re: 4R70W hard 1-2 shift (already replaced accumulator springs and piston) [Re: jbar430] #5389515 03/30/20 02:56 PM
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Fordiesel69 Offline
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You will want to look at the valve body for wear to the nylon balls. In some cases these can split or wear to half their diameter. Or the solenoid that controls the 1-2 shift.

With 250k its worth going thru the valve body anyways even if you find there is nothing wrong.

Try contacting this guy. He will ship you the parts:
https://www.facebook.com/Ford-transmission-repairs-Jmod-348414635312478/


99' Crown Vic Police - SAP (P71)
00' Crown Vic Police - SAP (P71)
08' Crown Vics Police - SAP(P71's) (total of 3 garage queens)
13' Taurus Police
14' Fusion S Base
Re: 4R70W hard 1-2 shift (already replaced accumulator springs and piston) [Re: jbar430] #5389519 03/30/20 02:59 PM
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Fordiesel69 Offline
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Watch some youtube videos on the VB teardown. It is not bad if you are careful.


99' Crown Vic Police - SAP (P71)
00' Crown Vic Police - SAP (P71)
08' Crown Vics Police - SAP(P71's) (total of 3 garage queens)
13' Taurus Police
14' Fusion S Base
Re: 4R70W hard 1-2 shift (already replaced accumulator springs and piston) [Re: jbar430] #5389863 03/31/20 01:54 AM
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Olas Offline
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buy a manual or fit a manual - it will only change gear exactly when you want it to, and you can control exactly how hard or soft each change is with your foot.

If you delegate the job to someone else they will do it how they want to do it regardless of what you want or what you think, but if you do it yourself you can do it just the way you like..

Re: 4R70W hard 1-2 shift (already replaced accumulator springs and piston) [Re: Olas] #5389945 03/31/20 06:38 AM
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Fordiesel69 Offline
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Originally Posted by Olas
buy a manual or fit a manual - it will only change gear exactly when you want it to, and you can control exactly how hard or soft each change is with your foot.

If you delegate the job to someone else they will do it how they want to do it regardless of what you want or what you think, but if you do it yourself you can do it just the way you like..


?????????????? huh?


99' Crown Vic Police - SAP (P71)
00' Crown Vic Police - SAP (P71)
08' Crown Vics Police - SAP(P71's) (total of 3 garage queens)
13' Taurus Police
14' Fusion S Base
Re: 4R70W hard 1-2 shift (already replaced accumulator springs and piston) [Re: jbar430] #5389960 03/31/20 07:19 AM
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Trav Offline
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PM member clinebarger and ask him to look at this thread.


ASE L1, Master. Deutsch Meisterbrief.
Re: 4R70W hard 1-2 shift (already replaced accumulator springs and piston) [Re: jbar430] #5389961 03/31/20 07:19 AM
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Falcon_LS Offline
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Did you check the resistance on the OSS sensor?


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Re: 4R70W hard 1-2 shift (already replaced accumulator springs and piston) [Re: jbar430] #5389987 03/31/20 08:00 AM
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Fordiesel69 Offline
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https://www.google.com/url?sa=i&url=https%3A%2F%2Fusermanual.wiki%2FSonnax%2FAode4R75EVactest.854772566&psig=AOvVaw2SCT1XNYexfWldb3gI_hFV&ust=1585684685343000&source=images&cd=vfe&ved=0CAIQjRxqFwoTCKjxlY_ixOgCFQAAAAAdAAAAABAJ

Here is a diagram of the valves.


99' Crown Vic Police - SAP (P71)
00' Crown Vic Police - SAP (P71)
08' Crown Vics Police - SAP(P71's) (total of 3 garage queens)
13' Taurus Police
14' Fusion S Base
Re: 4R70W hard 1-2 shift (already replaced accumulator springs and piston) [Re: Falcon_LS] #5389997 03/31/20 08:11 AM
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jbar430 Offline OP
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Quote
Did you check the resistance on the OSS sensor?


I have not - if that sensor was bad wouldn't it affect all of my shifts though? I will try and check it tonight.

Quote
Here is a diagram of the valves.


Thanks - that's really helpful.

Re: 4R70W hard 1-2 shift (already replaced accumulator springs and piston) [Re: jbar430] #5390508 03/31/20 09:35 PM
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clinebarger Offline
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Check for a worn Checkball, Notably the one for the Intermediate Clutch. Fordiesel69 already stated that. The checkball forces the apply fluid through a metered orifice to control shift firmness. To allow quick release of the apply fluid.....The checkball will unseat so the fluid doesn't have to exhaust solely through the orifice. The plastic balls can wear all the down 'til they pass trough the plate.....The the apply fluid is free to run through the exhaust unabated causing harsh shifts.

With that said.....I do find it interesting that manually shifting the unit calms the 1-2 shift.....This could technically be because the Intermediate clutch has excessive clearance & the O/D Band coming on in manual 2nd is cushioning the apply. Or even an issue with the Intermediate Sprag/Mechanical Diode.


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: 4R70W hard 1-2 shift (already replaced accumulator springs and piston) [Re: Olas] #5390625 04/01/20 05:40 AM
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Lubener Offline
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Originally Posted by Olas
buy a manual or fit a manual - it will only change gear exactly when you want it to, and you can control exactly how hard or soft each change is with your foot.

If you delegate the job to someone else they will do it how they want to do it regardless of what you want or what you think, but if you do it yourself you can do it just the way you like..

Laughable!


The "thinking" man's friend.
Re: 4R70W hard 1-2 shift (already replaced accumulator springs and piston) [Re: jbar430] #5390631 04/01/20 05:55 AM
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When you did the accumulator work, was it's bore in good shape without any scoring?

Any codes??

Last edited by Lubener; 04/01/20 05:55 AM.

The "thinking" man's friend.
Re: 4R70W hard 1-2 shift (already replaced accumulator springs and piston) [Re: jbar430] #5390697 04/01/20 08:12 AM
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JMod it


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1998 Mustang GT 4.6L V8 convertible
2019 VW Jetta SEL 1.4T
Re: 4R70W hard 1-2 shift (already replaced accumulator springs and piston) [Re: Lubener] #5392118 04/02/20 07:39 PM
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jbar430 Offline OP
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When I did the accumulator work I did not notice any scoring in the bore. Both springs were intact and the piston looked to be in good shape. I replaced the springs and pistons anyways since I had the parts on hand. The new piston felt like it fit just a little bit more snug.

The car isn’t throwing any codes but looking at the Mode 6 data it looks like my DPFE sensor is toast. I checked the voltage of the signal wire with the vac hoses disconnected and it registered around 1.2V. I went ahead and ordered a new DPFE sensor and am waiting on it to show up. I doubt that is causing the shift issue. Everything else on the car checks out ok and it runs and drives great. I also went ahead and got a new TPS even though the one on the car appears to be working ok.

The trans is 20 years old and has 250K miles on it without any rebuilds, just regular fluid and filter changes. I’m not sure I’m willing to invest the time/money to get it rebuilt.

Last edited by jbar430; 04/02/20 07:40 PM.
Re: 4R70W hard 1-2 shift (already replaced accumulator springs and piston) [Re: jbar430] #5392409 04/03/20 07:55 AM
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