4L60e help
Thread Starter
Teching In
Joined: Jan 2021
Posts: 8
Likes: 0
Don’t think I’ve watched any of precision transmission’s videos.....yet. I’ve ordered the abuse valves+components, and the o-ring plugs as well as another servo kit(as suggested). Plus the 4th gear oil feed Sonnax check valve(?) upgrade. Hopefully it all comes in before I leave for work again... updates to follow if I get all this done.
Don’t think I’ve watched any of precision transmission’s videos.....yet. I’ve ordered the abuse valves+components, and the o-ring plugs as well as another servo kit(as suggested). Plus the 4th gear oil feed Sonnax check valve(?) upgrade. Hopefully it all comes in before I leave for work again... updates to follow if I get all this done.
TECH Junkie
Joined: May 2012
Posts: 3,047
Likes: 714
From: Poplarville, MS
Don’t think I’ve watched any of precision transmission’s videos.....yet. I’ve ordered the abuse valves+components, and the o-ring plugs as well as another servo kit(as suggested). Plus the 4th gear oil feed Sonnax check valve(?) upgrade. Hopefully it all comes in before I leave for work again... updates to follow if I get all this done.
TECH Enthusiast
Joined: Jan 2019
Posts: 677
Likes: 490
From: Roxana, IL
I'm late to this party, but I will say that every Z-pack I tried failed early in a performance unit. I started using 7 Raybestos GPZ-105 4L65E frictions and 6-.095 Lindered steels for my 400-500hp or 8 Raybestos Stage 1 .060 frictions & 7-.078 steels for the over 500hp. Lately (within the last year) I have been using/pushing 4L79.com input drums for over 500HP. It has a screw on cap with 8-oversized (350 turbo diameter) 3-4 Raybestos GPZ frictions/custom steels & the Sonnax reinforcement kit. I've used 1 of each of his products and several of the actual 4L79 ones, so far so good...
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I've made fun of him in the comments more than once. I know....I can be petty....but I hate stupidity but yet portraying as if they are smart....
Sorry for the long period of time between updates, been away from my truck at work.
Pulled transmission. Disassembled and cleaned all pieces and parts. No surprise that the 3-4 clutches were toast.
Watched tons of videos. Read pages upon pages of issues. Ended up putting all new clutches in the input drum, new apply pistons in the input drum. New Z-pack for the 3-4 clutches. New 2-4 band. New filter. Flushed the entire system with like 10 gallons of fluid.
Everything went together good. Reinstalled in the truck. No issues. Trans still works, has all 4 gears, and still all the same issues.
Just to recap....
Slow, sluggish 3-4 shift when accelerating “spiritedly” and only the 3-4 shift
Rough manual 4-3 downshift like something isn’t disengaging and it jerks when cruising
And the slip then sudden harsh engagement in first gear from a stop. (Low roller clutch? Or low/reverse?) didn’t dig that far into the lower part of the trans.
Pump pressures are good if not on the high side, I can adjust pressures in HPTuners and the trans responds.
2-4 servo pin was in spec. Pin travel was in spec.
Could it be something in the valve body? Maybe a rebuild kit for it? Its a 2010 and it’s a different body than the 2006 trans I had as a parts one...
Really could use some tips, really don’t want to pull the whole trans again.
Thanks a ton
Pulled transmission. Disassembled and cleaned all pieces and parts. No surprise that the 3-4 clutches were toast.
Watched tons of videos. Read pages upon pages of issues. Ended up putting all new clutches in the input drum, new apply pistons in the input drum. New Z-pack for the 3-4 clutches. New 2-4 band. New filter. Flushed the entire system with like 10 gallons of fluid.
Everything went together good. Reinstalled in the truck. No issues. Trans still works, has all 4 gears, and still all the same issues.
Just to recap....
Slow, sluggish 3-4 shift when accelerating “spiritedly” and only the 3-4 shift
Rough manual 4-3 downshift like something isn’t disengaging and it jerks when cruising
And the slip then sudden harsh engagement in first gear from a stop. (Low roller clutch? Or low/reverse?) didn’t dig that far into the lower part of the trans.
Pump pressures are good if not on the high side, I can adjust pressures in HPTuners and the trans responds.
2-4 servo pin was in spec. Pin travel was in spec.
Could it be something in the valve body? Maybe a rebuild kit for it? Its a 2010 and it’s a different body than the 2006 trans I had as a parts one...
Really could use some tips, really don’t want to pull the whole trans again.
Thanks a ton
my question for you is, WHY? Why would you not PULL THE WHOLE UNIT APART and check everything? You found a problem with 3-4 and stopped right there? Well I guess you self taught yourself a lesson. When you fix/rebuild/diagnose a unit.....YOU MUST Disassemble COMPLETELY!!! Now you have to pull it back out. Its a good thing though....you can take that z pack and throw that **** in the trash. Use GPZ frictions or High energy. I prefer GPZ much more tho.
Apologies if I came off sounding aggressive........
Last edited by Kfxguy; Apr 1, 2021 at 10:05 AM.
