slipping?

[kpaton]

I think that my trans. is slipping. I have a 1998 5.4L, off road, 4x4 with 70,000 mi. on it. It has the E40D (4R100) trans. Symptoms: At 5,000 rpm the revs go up quickly but the truck seems to stop pulling. I put a superchip in a couple of weeks ago which raised my max rev. limit to 5,600, before it would shift at 4,900 WOT. The engine suddenly starts to race above 5,000 rpm, at first I thaught that it was the computer starting the shift sequence, retarding timing....and so on, but now I don't know. I put in a transgo shift kit a week ago, shifts are firmer but didn't eliminate the problem at 5,000 rpm. All other shifts at any other throttle position are good. Is this normal? Any ideas?

Register today or sign-in to remove these ads!

[DanB 360]

I think the computer automatically shuts off the engine if you reach 5500 rpms. It might just be revving up quickly b/c you're reaching that point.