From the 07 Manual(pretty sure its the same 5AT)

This a quick little test when you are cruising on the highway.

60+mph

Put your car into Drive, drive normally like you would just to keep up at lets say 70mph


Lift your foot off the gas completely, does the RPM stay steady?

Now go into Manual mode and do the same in 5th gear does it stay steady like it did in Drive? or does the RPM dip down?

According to the manual they are suppose to do the exact same thing, The Torque converter locks up and the RPM is suppose to stay steady when cruising.

In Manual mode at least for me the Torque converter does not seem to lock at all.

 

You're not testing it the right way. You should be using very light throttle on a flat grade at test this. Releasing the accelerator to test lock-up is pretty meaningless.

Also, the JATCO 5AT has a slip-lock function which allows the TC to be somewhat locked and somewhat slipping. This TC function improves throttle response and acceleration. If you're 5AT wasn't locking like it was suppose too, you'd be getting horrendous mpgs and check engine lights. These automatics don't behave like most other automatics in that you can't really feel them lock-up in most sitations. In many automatics, you can feel a slight thud has the TC locks. Not this one.

 

yea I understand our TQ converters have Slip, Slip-Lock and Lock

In Drive while cruising if I get on the throttle lightly or off , the rpms stay the same pretty much the same with the speed.

In Manual mode the RPM's drop when off the throttle and if I apply light throttle it feels as if the tranny is re-engaging and the RPM goes back up.

I feel like in Drive its properly locking up but in Manual mode its in Slip-Lock ?

 

Will test tonight.

 

^ did you get to testing it?

 

I'm kind of ignorant at the discussion at hand. Are you talking about how there is a slight play in the rpms at certain speeds?

Like if I am going x mph, the rpms are at idle and when I tap the gas it'll rev up to the engine speed that matches the transmission speed and then it'll actually accelerate?

I've definitley noticed the rpms just dropping to idle at certain speeds but I did not know there was a difference between manual mode and D when it comes to this. I'll test this out the next chance I get and I will post up.

 

yea, like it goes to idle and then when you tap the gas it goes back up, I believe this is "Slip lock"

At highway speeds In D it seems to fully Lockup while in Manual mode its still in slip lock. (thats what it does for me) According to the manual it should lockup as well.

 

I noticed nothing different while testing on the highway with light part throttle acceleration on a flat highway from 65mph to 80mph in D or MM5. What happens on my 5AT is that the rpms initially jump about 200-300rpms (essentially reaching the OEM stall speed of ~2800rpms) and then the car accelerates with rpms rising in a linear fashion to mph, indicating the TC is likely locked. Since these TC in these cars are relatively high, it makes me wonder if the TC will be in slip-lock until stall speed is reached and from there the TC becomes locked (assuming it's a part throttle situation). By allowing the TC is slip slightly, it gives you a slight burst of acceleration and gets the motor closer to it's powerband (3000rpms+). Most automatics have much lower stall TCs and basically feel like a true manual when you do part throttle acceleration in top gear. I rent lots of cars and trucks for work and I can say the 5AT in the G is by far one of the best feeling and most responsive automatics around. The gearing and the TC is just about ideal.

 

Yes. The reason you feel this 6th gear shift is that the valve body has raised line pressure which makes the TC lock-up quicker and harder.

 

Yep, the Speed and RPM climb linearly when accelerating in both MM and D

What I am primarily talking about is the initial tap onto the throttle and let go of the throttle. They act differently in D and MM.

Here is a little video I made, showing what I am talking about



So in Manual mode it does the slip-lock deal while in Drive its Just locked?

 

Mine definitely doesn't do that, but I'd have a hard time believing there's any problem with your car. The systems are just too smart and would throw a code if something was right. It must be another difference between the 03/04 and 05/06 5AT.

 

I pretty sure mine doesnt do that either... I'm curious now so I will try to remember to check... seems like I'd notice that if it was happening...

it would be interesting if mine behaves like yours (that would indicate differences in 05-06 from 04.5 which until now I havent known of any).

I hope others 05-06 will chime in with their findings...

 

I'll test mine soon.

 

Are you putting your foot all the way to the floor, or just stepping lightly on the throttle? I'd go test it out this afternoon, but we are supposed to get 3-6" of white stuff so all i'd see is SLIP SLIP