now, this thing is my DD, and I'd like it to shift rather smooth, ya know. So when I go down to the Clutch and Transmission shop, what should I ask them for? A stock tranny would work, but you guys were talking about these kits. So I'm figuring I'm going to have to have my transmission replaced (which would happen in a few years anyways, so might as well get it done now). I pulled the dipstick to make sure, the tranny fluid smelled kinda funny, and there were chunks of material on the dipstick, assummingly pieces of my clutch packs.
#4l60e shift kit hard into first code#
Anyways, my truck's been shifting hard (1 to 2, hard 2 to 3 okay 3 to 4 just a little hard shift) and threw me an engine code (it's done it before, once, I'm guessing it's the same code for the tranny) and with 130k miles on it, I'm sure the tranny's trying to tell me she's gettin old and worn out. Hey, want to dig this one back to the top. Hope that helped- now back to my turn signal problem. If you have the transmission rebuilt and they DO NOT fix this valve body issue - The problem WILL come back.Ī short-term fix - when the harsh shifting occurs - pull over and turn off the truck for about a minute - then crank up the truck again and the harsh shifting is gone (for the time being) - this resets the valvebody and allows for normal operation again, but the problem will come back if driven for long enough again. You do not have to drop the transmisson to have the valvebody fix completed - a knowledgeable shop can likely do it, but ask them before dropping it off (if you are not doing it yourself). If they are familiar with the Sonnax kit to fix the 4L60E - they will also likely have the reamer already. To do this repair correctly - you need to find a shop that has the correct Sonnax Reamer (#7754-R2 - $105-$140) to correct the valve body problem and replace the TCC regulator and sleeve with the updated parts. ** NOTE: I have no affiliation with this website nor have I ordered anything from it - I merely used it as example to demonstrate the parts and their numbers You NEED to replace the regulator with a Sonnax TCC Valve Regulator Valve Kit found here - quarter of the way down - after #43G. The real culprit is the TCC regulator valve. The real reason for the problem is the valvebody - it needs to be corrected (and if done early enough in the life of the tranny - it won't cause damage). If your tranny has 130k miles on it then - yes- it may need a rebuild by now, but that is not what is causing the harsh 1-2 shifting when warm. What many mechanics will say - bad tranny, needs rebuild, needs replaced, etc.
This kit will smooth the 1-2 shift and not make a neck snapping shift.Īfter driving for about 30+ mins the car starts to shift violently on the 1-2 upshift and if not corrected it would throw a SEL (Service Engine Light) with a code of P1870. And one thing to remember.the kit is a "shift improver" and not a "shift kit" like used to be put in the Turbo 350's and Turbo 400's. I'm just glad I looked at rebuilding the tranny later on though. But the shift improver kit did help a lot and was worth it. from what I seen, it is or appears to be, cheaply made from the factory. My nephew who is a certified mechanic said that he has seen that quite a bit in the 4L60E's. One thing I did notice, and I am not sure what it is called, but it is the drum that the clutch pack sets into, was belled out a little at the top and closer inspection revealed that it was cracked. Later on I decided to rebuild the tranny as I had it out of the truck again. When I redid my engine and had the tranny out, we added the kit. But everyone that I talked to said they had the same problems with that particular tranny.
When I first got the truck, with the way it shifted, I figured the tranny would not last long. You can, and I would, recommend a shift improver kit. It's characteristic for the 4L60E to shift hard between 1 and 2.
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