Sonnax 4L60 4L60E 4L65-E & 4L70-E Pinless Accumulator Piston Kit

Im not saying my shift is 100% like new but it was a noticable difference. 95% shifts real smooth vs before 1% of the time if i let off the gas it shifted smooth. Theres also a great video on youtube on how to install it. Only like 15 miles so far will update if anything changes.

No issues and nice upgrade from stock plastic piston with the rod. I noticed slightly better shifting

Great Product The Factory OEM ..Accumulators are made of PLASTIC.. the GENERAL MOTORS "ENGINEERS" must Hate America Because .. If anyone purposely designs A "Plastic" Product that is Deep in the internals of A Transmission ..with Extreme Heat and Constant Movement EVERY TIME THE TRANSMISSION SHIFTS.. MUST KNOW THAT THE TRANSMISSION WILL FAIL.. AND That Will Cost Americans .. THOUSANDS OF DOLLARS IN REPAIRS... G.M. ..WHY WOULD YOU DO THIS TO FELLOW AMERICANS? SHAME ON YOU..!!! GENERAL MOTORS .. SHAME ON YOU !!

Installed in my gmc envoy 2005 transmission lying on the floor . Better smoother gear changes with a new set of solenoids . Installed after 200 k miles . Softer gear change .

No instructions included, but there's enough information online to complete the easy install. Good quality parts.

The 1-2 shift in my 1999 Chevrolet Tahoe was becoming harsh. This Sonnax Pinless Accumulator Piston Kit was straightforward to fit and solved my issue.

Fit like a OEM part. I noticed an immediate difference in shifting. To my fellow shade tree mechanics. Watch out when torquing the accumulator back into the valve assembly. It is aluminum and it doesn't like 10lbs. I did between 7 and 8 ft lbs.

2003 Suburban with 4L60E transmission. My 1-2 shift was harsh only when cold. Dropped the pan with no interference on exhaust crossover pipe and bent the shift bracket over a bit to remove. I just re-used the original springs. Installing was a breeze. Check out YouTube for a video with all the instructions. This improved my 1-2 shift by 75%. Might have had even more improvement if I had replaced the larger spring - who knows? Remove close to a gallon of ATF from the pan and replaced about the same. Chevy calls for Dexron III but the Dexron VI is backwardly compatible. (Don't forget to order more like I did). For the price and 2 hours worth of elbow grease it was worth it!

mejoro la transmisión recomiendo su uso es fácil de instalar lo pude yo mismo y no soy mecánico

Not sure how or why, but this fixed the 1-2 Rough shift and 2-3 weak/sloppy shift in my 2003 Sierra 1500 with the 4L60e. It drives like a new truck. It will take a decent amount of experience to DIY this. I’m no transmission builder, but if you got some buddies and a hoist, it’s a breeze. Do lots of research on youtube on how to do the job before attempting. The trans pan must be dropped to do the job. Great product.

After doing some research on the harsh 1-2 shift in my 2011 Silverado with a 4L60E trans, I found that this was a common upgrade and fix for the issue. It's very easy to install with basic mechanical skills. If you can do a transmission service, you can do this upgrade. (see YouTube for instructional videos). After installation, and trans service, the truck shifts smoothly, as it should. My only complaint about this product would be that it is shipped in a bag, but it should be in a box for a little more protection, as the piston is aluminum and if it gets dropped, it could definitely damage it. Mine had a small dent on it that you could tell was likely caused by a drop, or it hit something, but luckily it was in a spot on the piston that had no affect on it's performance.

Fixed my sloppy slide and bump 1-2 shift on my 2005 GMC Sierra Crew Cab with a 5.3l and a 4l60e. It started shifting weird out of the blue coming up on 250 000 miles or 400 000 kms. I changed the fluid, filter, shift solenoids and a new accumulator housing with this sonnax piston installed. Now it's a nice solid feeling quick 1-2 shift. Now I'm noticing a hesitation during the 2-3 shift under light to moderate acceleration so I'm thinking of replacing my stock servo with a corvette servo.

Good quality product