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Discussion Starter · #1 ·
Started noticing an ugly shift when accelerating in my 2007 Mazda 3 hatchback going from 3rd to 4th gear. Did a transmission fluid flush using Valvoline Maxlife, but the problem is still there. Only happens after the transmission heats up - like after 15min of driving on the freeway.

Saw a post of people experiencing the same problem on a Mazda 6.
http://forum.mazda6club.com/atx-transmission-discussion/245438-3-4-shift-shock.html

And there's TSB "A/T 3-4 Shift Shock Under Load" bulletin number 05-010/10, which also applies to the 2007 Mazda 3.

I can't find a copy of the TSB, but someone summarized it as: "According to the TSB, the servo piston bore for the 2-4 band wears and causes the servo to leak oil. Mazda fixed the problem by making the pistion bore out of a harder material. The only permanent solution would be to replace that part with the new one, which requires taking the transmission apart."

Anyone have any more info on this? I can't believe getting a 'new' transmission is the only answer!

BZ
 

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Discussion Starter · #2 ·
Interesting that no one else has this issue.

When the problem gets really bad, I think I would have to go the transmission rebuilt route and re-sleeve the servo bore with a brass insert. Haven't gotten a price quote yet, but I hope it won't be much over $2k.

Since the problem only happens when its cold, I tried adding a transmission cooler to the car to minimize the symptoms. With the cooler in, the shifts aren't as harsh when it warms up. The theory being that with the transmission fluid being cooler, it's more viscous and the pressure loss from the servo bore wear isn't as much. But I think it's only a matter of time before the wear gets worse and the problem needs to be fixed.

Very disappointed with Mazda/Ford about the transmission. It really shouldn't be having these problems at 86k miles.

BZ
 

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Discussion Starter · #4 ·
[quote author=dugger_8 link=topic=201818.msg4174717#msg4174717 date=1326831049]
We started having the same problem with our 07 mazda 6. I think I'm just going to drive it till it dies then replace the trans with a lentec one (base one).

http://www.lentechautomatics.com/aodproducts.html#
[/quote]

Does Lentec make a replacement transmission for the 5 speed ATX? I can only find a listing for the 4 speed one.
 

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I know this is a few years old but I have an Mazda 3s 2007. After doing a transmission fluid and filter change at 100k I also have noticed shift shock between 3 and 4 after driving on the highway and then going back onto normal roads. Wondering if you ever figured a solution?
 

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Discussion Starter · #7 ·
I really think a Servo piston with an O-ring would solve the problem - but no one seems to make a kit for the Mazda 3's transmission.
In the end, I just ask the kids to drive the car in manual shift mode all the time. Let go of the gas briefly when shifting from 3 to 4. Not much of a solution, but cheap!

BZ
 

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Mazda's solution is to replace the transmission. The new ones have a hardened servo piston as stated in your earlier post. I attached a thumbnail of the problem flow chart from the TSB 05-010/10. Don't know of aftermarket options.
 

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no one seems to make a kit for the Mazda 3's transmission.
Incorrect. There are repair kits. You are not the first person with this issue.

Are we talking about FS5A-EL? Search for Northland 4F27 servo bore repair kit. It covers both of these (4- and 5-speed) trash Jatco transmissions.

I generally advise to talk to your local transmission specialist. No disrespect to the forum members, but you will get better results talking to a professional.
 

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BTW, interesting idea to install a cooler, bzee. What cooler did you install? Can you send a link?

Did you also measure the temperature drop?

What was your conclusion? These transmissions run pretty hot - over 100C (~210-220F) on a hot day. Considering shift shock starts around 65C (150F) according to TSB, I feel a bit skeptical.
 
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