The Volvo Parts, Accessories & Performance Specialists Since 1963 800-444-6473
Fuel Injection Relay

107960 - Automatic Transmission B4 Servo Cover Update AW55-50/51

loading$30.95PER KIT
CROSS REFERENCE30651771, 30751262, KIT-30751262
This product is specific to particular car models. You should check fitment for your car before buying.

Product Description

It's ironic how this inexpensive part can save someone from a costly transmission replacement.

The early AW55-50/51SN five speed automatic transmissions have an issue with shift “flares” and other odd symptoms related to shifting in and out of 3rd gear. This usually reveals itself by a “missed” shift (somtimes called "shift flare") from 2nd to 3rd gear on a random basis.

This B4 servo cover update can solve these symptoms in many cases. Other times, it may take a software update or the B4 problem has gone on too long and the transmission is physically damaged.  It is possible for transmission damage to occur when the transmission hooks hard up after a flare condition under heavy load.

Volvo has changed the design of the B4 servo cover multiple times and there are numerous Volvo service bulletins regarding it. The latest design is stock on later model years.

We highly recommend a transmission software upgrade prior to or in conjunction with the B4 servo cover update!  A fluid flush would also be a good idea.

The software for these electronically controlled transmissions has gone though many version changes over the years and has become much more refined.  A software upgrade can significatly reduce neutral to drive delays and shift flare.  If your car still easily rolls backwards when in drive while facing up hill on a slight slope, then you most likely need a software upgrade.  The neutral-at-a-stop while in Drive "feature" was removed with later software versions because it can cause damage when the transmission engages hard.  Recent software versions will also roll backwards but not a freely (not like the car is in neutral.)

Transmission software upgrades must be done with a Volvo specialty shop using Volvo's VIDA application.

The B4 Servo issues usually don't affect 2004 and newer models, but some of these cars still have a variety of shifting issues that can be solved in many cases by a transmission software upgrade.

Product Status & Availability

Adding items to your shopping cart and placing an order is only an intent to purchase. We will not charge you for anything until we can ship the products you ordered (if paying by credit card. PayPal is a prepayment method.) We will do everything we can to fill your order in a timely manner. You can cancel your order at any time prior to shipment.

This item is an Kit-On-The-Fly product. It consists of multiple component products that are all pulled together at the time of shipping.
Additional component stock typically takes 12 days or less to arrive and get be available for shipping.

Units available to ship:10+

Product Images

107960 Customer Submitted Photo
107960 Customer Submitted Photo
107960 Customer Submitted Photo
107960 Customer Submitted Photo

mcafee site safe Network Solutions SSL FaceBook YouTube Google Plus Pinterest Instagram Twitter Yelp Foursquare

Local 503.257.7500 / Toll-free 800.444.6473 / Fax 503.257.7596

Monday Through Friday: 8:30 AM to 5:00 PM Pacific Time

11744 NE Ainsworth Circle / Portland OR 97220 USA

PO BOX 20339 / Portland OR 97294 USA