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32 reviews
4l60 Z-pak
These clutches are pretty good. No doubt. I’ve used them before and this is a second go around. Unfortunately the 4l60 is a pretty poorly designed unit. The input drum that houses this specific clutch pack isn’t strong enough to hold the power these clutches are capable of. My recommendation, if you’re really serious about building a 4l60, is to buy the upgraded input drum by sonnax. It has a bolt on plate to hold everything rather than a flimsy c-clip.
With that being said I can personally say that using a stock input drum I have hauled over 2,300 lbs of shingles in the bed of a single cab pick up. Definitely overloaded the suspension.
I was using stock accumulators and a corvette servo. The higher stall probably didn’t help the temperatures in the transmission, but this z-pak took the beating. I reached about 70 mph for most of a 36 mile trip. Twice. Back to back.
If I had the newer drum I’d probably have a lot better longevity with the unit. I have tried pinless accumulators, a super servo, the ultra wide band, and upgraded pistons. Replace the input drum. If you don’t you’ll end up buying another set of frictions.
But all in all these are a good “go to” affordable upgrade. Read full review
Verified purchase: Yes • Condition: new • Sold by: usa.industries
Very good product
This is very good product but price is getting high and high
4 month ago I bought about $60-65 but now $110-130 it’s same product
Look to me just lipped off
I need this product but recommend?
I have to think about it.
It very hard to find good sailor
Some sailor charged $40 for shipping
What wrong are people
Most people are money slaves
They don’t care product and needs Read full review
Verified purchase: Yes • Condition: new • Sold by: atkits
The best 3-4 clutch pack for 700R4-4L70E transmissions
I have been using this clutch pack in my transmission for over 10 years in a high performance street car that runs high 12's if you can hook it up! Has held up better with a stock high gear drum than anything else I have used.Read full review
Verified purchase: Yes • Condition: new • Sold by: usa.industries
Z-Pak is a Must for any 4L60e build.
Rest easy at night knowing the Z-Pak will turn your 4L60e into a powerhouse capable of pullin the panties off a nun..!
Verified purchase: Yes • Condition: new • Sold by: atkits
exellent product.complete instructions.
Just follow the instructions and they leave no guess work.
unlike many other kits which require some configuring to get the correct stack height.
Also, many Transmission shops use this as there go to reliable High Performance Clutch pack for 3-4 on the 700R4.
Read full review
Verified purchase: Yes • Condition: new • Sold by: danduv78
Perfect for the DIY shade tree mechanic.
I love that everything you need is included in the package. Time will tell if they are as good as advertised.
Verified purchase: Yes • Condition: new • Sold by: atkits
Installed the zpak in my transmission, works great , highly recommend
Great product, I installed the zpak and new pistons about 3 weeks ago . Transmission is shifting better than it ever had. Would purchase again
Verified purchase: Yes • Condition: new • Sold by: danduv78
Installed part and works great
Installed and works great
Verified purchase: Yes • Condition: new • Sold by: usa.industries
Durable and easy upgrade.
Great Upgrade. I use it for all my plow truck and towing builds.
Verified purchase: Yes • Condition: new • Sold by: maxxindustries
Great upgrade
This helps address one of the first things to fail in these transmissions with age
Verified purchase: Yes • Condition: new • Sold by: transmissionjobber