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Your cart is empty.Line Pressure Booster Kit4L60-E, 4L65-E, 4L70-EFits Early-Style Pump Early-style pumpValveSleevePressure Regulator SpringO-Rings (2)Line pressure booster kit 4L60E-LB1 fits early-style GM 4L60-E, 4L65-E and 4L70-E pumps. Sonnax hydraulic line pressure booster kits contain stronger pressure regulator springs and large ratio boost valves designed to work together to provide progressive pressure increases as driving conditions become more demanding.Our pressure regulator springs are approximately 10 stronger than OE and more conservative in impact than other aftermarket kit springs. Large ratio boost valves provide higher pressure incrementally and when it is needed the most. The combination of these springs and valves in a Sonnax kit gives you the best of both worlds: a modest pressure increase at the low end, with a high-end pressure that is equal to or greater than that of other aftermarket kit springs.Achieve shorter shifts and increased torque capacity without creating low-speed harshnessImproved band and clutch holding capacity for increased durabilityProgressive pressure increase as driving conditions become more demandingAll the benefits of increased line pressure without overloading the pump at idleSimple and affordable drop-in solution with no special tools or reaming requiredNOTE: Fits early-style pump with long 1.907" sleeve only. Use 4L60E-LB2 for later pumps with short, 1.810" sleeve
Mark
Reviewed in the United States on June 9, 2024
This fits as described
Customer
Reviewed in the United States on October 5, 2024
Easy install and improved the shift once the pan was removed it took maybe 5 minutes to install
Kyle Raley
Reviewed in the United States on July 25, 2021
Installed this, along with a Sonnax 1-2 accumulator, during a fluid and filter change. Took me longer to find my snap ring pliers than to do the whole job. No more hesitation going into reverse, and overall shifting feels a lot cleaner. Would definitely recommend to anyone.
Mark Reese
Reviewed in the United States on May 19, 2021
Thank You
Trinity
Reviewed in the United States on September 2, 2020
You do have to drop the pan. Pressure was increased. Shifting perfectly now. Was slow going into reverse. Now it's shifting like new again. This went into a rebuilt done by Bulldog? out of Atlanta who claimed to over build the tranny. I was a bit surprised they gave me back an older style to replace the newer style they received as a core. The booster in it was stock. The new one is NOT steel. BUT, it's working like a champ. Another Shop told my customer they needed a new rebuilt tranny for $4200. Just hooked it up to scanner and gave that diagnosis for low pressure. There was no debris in the pan or old filter. Everything was fine except for slow going into reverse in high range. New booster fixed the problem and now it's just like normal going into reverse and my customer was tickled not having to shell out all that dough.
Dan Carls
Reviewed in the United States on February 23, 2020
I k how I gave it a 5 star. I was not able to use it because the reconditioned valve body I received had the larger valve. But I have used this brand valve in another transmission and it worked great.
FatBoy
Reviewed in the United States on October 30, 2020
This is a great HD boost valve. Highly recommended.If you're eyeing this item, you likely understand the hydraulic circuit you're playing with here. This brings a positive engagement, and provides the proper on-demand line pressure that I was looking for without going to the .500 valve.I have had a few people complain, commenting on "harsh shift" where as, it seems perfectly reasonable in terms of shift feel to me. The shifts are no longer the stock laziness, and are nice and short at WOT.
LBT
Reviewed in the United States on March 3, 2018
I ordered this kit with the Sonnax super hold 2nd and 4th servos. This was installed in a Caprice wagon with about 80k miles on the transmission. I installed them all at the same time, so I don't know how much of the improvement came from each of these parts. The shift improvement was noticeable to me, but definitely not harsh. My wife did not seem to notice or at least did not complain. So if you're looking for neck snapping shifts from your 4L60, you will need to do more than just these 3 parts.In vehicle installation was pretty simple. It is pretty easily accessed by dropping the pan. Should be easily accomplished by most home mechanics.
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