4L80E 4L85E Transmission Boost Valve O-Ring Style Sonnax 34200-01K4L80-E, 4L85-EBoost Valve KitPart No. 34200-01KO-Ring style. Kit can be retrofit to back to '89 units. See instructions for details.Common problems in vehicles with GM 4L80-E and 4L85-E transmissions are uncontrollable line rise (upward of 500-600 psi), high line pressure in Reverse, buzzing noise, broken direct clutch drums and/or broken cases. These problems are usually caused by reverse boost oil that enters the torque signal circuit due to a wear-created cross leak at the sleeve. High line pressure and buzz is created by oil leakage past the aluminum balance plug. The Sonnax boost valve kit 34200-01K eliminates these problems.Hardened steel boost valve has over 20% wider spools to provide better durability and increased sealing contact areaBoost valve spools have annular grooves to reduce side loading that causes wearQuality steel boost sleeve with external O-rings provides positive seal to compensate for pump cover bore wearKit includes a replacement aluminum balance oil plug with an O-ring to ensure proper sealing and adequate back pressure on the pressure regulator O-Rings (2)
Balance PlugBalance Plug O-RingWe welcome offers and all reasonable offers will be considered. When making an offer please consider product cost, shipping cost, and your location. This is especially important when making offers on smaller value items. We offer free shipping on most of our parts; therefore, if your offer does not even cover the delivery cost, it doesn’t make sense for us to accept it.
A good rule of thumb is to offer no more than 15-20% less than the listing price.
Important InformationShippingCore PolicyWarranty & Limitations ReturnsImportant InformationShippingCore PolicyWarranty & Limitations Returns
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As a buyer, it is your responsibility to verify that this part is compatible with your application.
We WILL NOT pay for return shipping for parts ordered in error. If you order the incorrect part and start a return selecting the reason to be anything otherwise, you will be reported to in order to recoup shipping fees.
All Ford branded parts are genuine Ford OEM part. We purchase directly from Ford Components in bulk, which means the parts may not come in traditional dealer-branded packaging. Additionally, part numbers are removed (dremeled off) per our pricing agreement with Ford Components to ensure any returns are processed through us and not a dealership. Rest assured, the quality and fitment are identical to what you’d receive from a order will be shipped within 1 business days (MON-FRI excluding holidays) of receiving payment and you should expect to receive it five to seven days via US Postal Service or UPS Ground Standard Shipping unless another shipping method is chosen. In addition to UPS Ground, we offer expedited services as well as local pick-up. Please contact us if a quote is needed and we will be happy to work with you.
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Please make sure you monitor your package. Any import duty/taxes must be paid by the buyer. If you do not pay in a timely fashion your package will be returned. You will not receive a refund for the returned items until they’re delivered. Shipping fees will not be reimbursed. style="text-align:justify">CORE RETURN DIRECTIONS & GUIDELINES
Cores must returned within 30 days of the original purchase or any claim to warranty will be null/void.
Cores must exhibit normal wear and tear conditions.Cores must be drained of internal fluids.Cores should be wrapped in plastic when repacked for shipment. A garbage bag will suffice.Repack your core inside the box the replacement part was received in. It is extremely important that the core be returned inside its original box for identification purposes.Securely tape your package closed.PLEASE mark the outside of your box clearly and in large lettering with the words "CORE RETURN". This helps make sure that your package remains identified within the warehouse as a core.If the item you purchased has a refundable core charge, you, as the buyer are responsible for return shipping to receive core credit.
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Please note that this core policy only applies to purchases made through an e-commerce platform.
Whatever It Takes Transmission Parts warrants this product to be free from defects in materials and workmanship at the time of sale when used under normal, intended operating conditions.
Not all products sold by Whatever It Takes Transmission Parts include a warranty. Any warranty coverage applies only to products that are explicitly identified as having a warranty at the time of purchase. The information below outlines the terms and limitations only if a warranty is provided with the specific product.
What’s Covered
- Manufacturing defects in materials or workmanship
- Failures under normal, intended use
If a defect is confirmed, liability is limited to replacement of the part or refund of the purchase price, at our Not Covered
- Normal wear and tear
- Improper installation or incorrect application
- Misuse, abuse, neglect, accidents, or modifications
- Damage from overheating, contamination, improper lubrication, or lack of maintenance
- Labor costs (installation, removal, diagnosis)
- Consequential or incidental damages (downtime, towing, loss of Notice
Professional installation is required. Failure to follow manufacturer and industry-standard installation procedures will void this warranty is limited to the product only and does not cover related components or vehicle damage. Maximum liability shall not exceed the original purchase price.30-day return policy for unused, uninstalled items. Any product you return must be in the same condition you received it and in the original packaging.
If you’re having an issue with a used or remanufactured item and it’s been installed, we require the buyer to contact us immediately so we can provide trouble shooting information. Worst case scenario if that fails, exchange only.
Certain item such as fluids, used items, tools, and one time use items are not eligible for return. As a buyer, it is your responsibility to verify that this product is compatible with your you ordered the wrong item for your application YOU are responsible for the return shipping.
20% Restocking Fee May Apply
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As an industry veteran in the transmission parts supply business, you can buy with confidence. Our goal is to provide high quality parts, an experienced sales force, and the highest levels of product availability possible.
- Balance Plug
- Balance Plug O-Ring
4L80-E, 4L85-EBoost Valve KitPart No. 34200-01KO-Ring style. Kit can be retrofit to back to '89 units. See instructions for details.Common problems in vehicles with GM 4L80-E and 4L85-E transmissions are uncontrollable line rise (upward of 500-600 psi), high line pressure in Reverse, buzzing noise, broken direct clutch drums and/or broken cases. These problems are usually caused by reverse boost oil that enters the torque signal circuit due to a wear-created cross leak at the sleeve. High line pressure and buzz is created by oil leakage past the aluminum balance plug. The Sonnax boost valve kit 34200-01K eliminates these problems.Hardened steel boost valve has over 20% wider spools to provide better durability and increased sealing contact areaBoost valve spools have annular grooves to reduce side loading that causes wearQuality steel boost sleeve with external O-rings provides positive seal to compensate for pump cover bore wearKit includes a replacement aluminum balance oil plug with an O-ring to ensure proper sealing and adequate back pressure on the pressure regulator O-Rings (2)
Balance PlugBalance Plug O-Ring
