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View Full Version : 4l60e 1-2 shift slip


jensamin
02-27-2006, 02:06 PM
Hey-
I've noticed recently (after putting my heads/cam in) that my transmission does this wierd thing where it wont shift. Like from first to second.

If I gun it off the line, the RPM's go up, and the shift point is 6250 (i think), but it doesnt shift. It hits the rev limiter, and bounces a couple times, and by then I'm too pissed off to see what happens.

When I'm not gunnin it, I feel it START to shift, and then I lay off the gas and it shifts. HARD. I do have a b&m shiftkit, but even without that, it shifts hard. The transmission slams when it shifts.

When I'm in like, third gear goin 40, and hit it, it downshifts, pumps up to redline and does the bouncing thing again.

It only does this hot, not when it's been sittin for a day or so.

My questions are:
-What causes this? my pcm scanner hasnt picked up any DTC's (I dont know if this would throw a DTC)
-Is there any picture online that I can look at for replacing individual pieces/parts in the tranny?
-In worst case scenario, I have to replace my transmission- wheres a good spot to get a race ready transmission that might be able to handle adding a blower on :)

Thanks for all your help!

LS13RDGEN
02-27-2006, 02:19 PM
Did you change the shift points from stock?

jensamin
02-27-2006, 02:21 PM
they should be different, i do believe. The tuner (PCMforless) told me that he had put the shift points to between 6250 and 6300 with the rev limiter at 6500 (which is what i believe is causing the bouncing)

LS13RDGEN
02-27-2006, 02:34 PM
Well, it sort of sounds like the 1-2 clutch pack is slipping and that in turn is causing you to hit the rev limiter.
Now the "hard" shift into second when under normal driving could be a bad seal, valve, spring, junk caught up in the valve body or just burnt up clutches.
If it was a solenoid going bad, then it should have thrown a code.
If this is a stock tranny and you have gone with heads/cam on your car; the tranny will eventually bite it.
I suggest checking out the sponsors that we have on here as far as getting a good tranny. :D
If you are on a tight budget though shoot me a pm. :D