2007 CX-9 Touring 4th gear slam

[Davicho]

Hello guys, wife and I have had our CX-9 since 2009 and it has been fully maintained with complete (11+ qts) of trans fluid evac and fill every 20-25k miles using T-4 fluid from Toyota which is compatible with the tranny (JWS3309 fluid). It is still running nice and smooth (knocking on wood) but this last weekend I was accelerating in a large three lane avenue and when it got to shift into 4th gear it literally slammed so hard into gear it felt as though someone had rear ended us. After that, no codes or no flashing "D" at all and smooth as always...very strange. I have a Touring model FWD and I added an after market hitch. So it didnt come from factory with the towing pkg. Two things to consider...
1. I did let go of the gas as it shifted into 4th because i was going to slow down up ahead on a red light
2. I had just dropped off an empty 12' flat bed toy-hauler trailer that I had been using and towing all morning long with about 1000lbs of cargo

Any thoughts??

 

[ceric]

Davicho,
I wouldn't worry about it, but take a note of it and watch out for the next few days.

You worked at a Mazda dealer, correct? (if my memory serves me right)

 

[Davicho]

What's up Ceric long time I haven't posted here on the CX-9 forum, I've been keeping busy at the Mazda5 forum. Although I plan on being more active here again. Anyway, you got it somewhat right. I work for the wholesale parts dept at a new car dealership network where we carry Chrysler Jeep Dodge GM Honda Toyota Scion VW and Ford and their subsidiaries of course which equal out to about ~21 car lines. However none are Mazda unfortunately. Good to hear from you again. Thanks for the advice I will keep an eye on the tranny behavior but like I said it only did it that one time and then smooth as always again. Even the ATF looks fairly clean at ~20k miles of use. I'll be changing it via drain and refill this next time in about another 5k miles and use agin the Toyota T-4 fluid.

 

[table5511]

I use the toyota t-iv fluid as well now. I have had a light "slam" when braking to come to a stop on maybe 2 occaisions just randomly in the last few years. Wouldn't worry about it, just a hiccup.

 

[Davicho]

I use the toyota t-iv fluid as well now. I have had a light "slam" when braking to come to a stop on maybe 2 occaisions just randomly in the last few years. Wouldn't worry about it, just a hiccup.

Thanks for chiming in I appreciate it.