This is almost what mine is doing. This morning, it didnt do anything. Today on lunch, it did it once while accelerating. Mine does it in 1st gear right around 2,000 RPMs, and its like I put it in nuetral and then back in to drive again. Sometimes when it catches, it will jerk the truck. If I drive it hard from a stop sign when its cold, it just grips and goes. Only when I take off normally does it slip. Ive read it could be the speed sensor ... but who knows. I figured for $45, Ill let the shop figure out whats wrong with it.

 

did you try setting your truck back to stock?

 

No, it sounds dumb but Im trying to get the problem to get a little worse so they can actually find it on Tuesday. I highly doubt the problem is in the tuning. Its something in the electronics, and by setting it back to stock it may cover up the problem. I would rather just have it fixed so Im going to set it back to stock sometime this weekend. Plus, theres no way I can live without the Superchips so it needs to get fixed. Lol. Im a premium fuel junkie.

 

uh.. silly question, but how cold is cold??

any chance you've off-roaded your truck and got a bit of water into the fluid??

could it be something as simple as the water/fluid crystalizing in the valve body or the torque converter and momentarily slipping till the crystals are dispersed/melted?

 

Anywhere from like 40 degrees and lower and I don't go offroading with my truck, but that last part sounds like a possibilty.

 

Cold is about 15 to 20 degrees, and around -10 to 0 degrees with the wind chill.

I havent been offroading since spring, and I got the fluid changed in August. Condensation is always a problem though regardless of offroading. Moisture always accumulates on the side of something with the heat. So inside your engine and transmission. Im almost beginning to think its the check valve between the torque converter and the pan; all the fluid is leaving the torque converter while the truck sits and it doesnt build up fast enough.

Ill check the fluid tomorrow. When I check the fluid, Ill be looking for 2 things. When its at operating temp, it should be at the HOT mark. When its cold with the engine running, the fluid should be above the HOT mark. This would show that the fluid is coming out of the converter while parked. Atleast thats how I understand it.

 

Mine does the EXACT same thing, has since I've owned it. If I floor it in 3rd or 4th and it shifts down to 2nd and then I let off while in second, the tranny shutters and jumps/lurches forward. I will be keeping an eye on this thread.

 

A very simple way to check the bad check valve theory is to shift it into 'N' when you first start it up in the morning and let it idle for a minute or so before leaving. Shifting to 'N' will allow the fluid to circulate and refill the TC if that is the problem. Good luck for the easy fix.

 

Shouldn't need to shift to nuetral. Letting the engine idle in park would do the same thing.

What's wrong with a junkyard tranny? I bought mine for $500 when I bought my truck about 4 months ago and it's been great.

 

I don't want to get into a pissing contest on the subject but idling in 'P' is not the same thing as Idling in 'N'. To prove my point, check your tranny fluid level in 'P' and then check it in 'N'. You'll find the fluid level to be approximatly 1 qt lower in 'N' than in 'P' because the fluid is circulating and is not in the tranny pan. This is why the factory instructions for checking the fluid level is to be done with the tranny in 'N'.