GU Replacement Gearbox with Deadbolt - OLD Style

Price £28.20 (Inc. VAT)
£23.50 (Ex. VAT)
(28 reviews) Write a Review
Part Number:
DL-GBX-GU-Old (GUCASE35OLD) (5055621404169)
In Stock
Delivery Cost:
Calculated at Checkout
GU Replacement Gearbox with Deadbolt - OLD Style

The OLD GU gearbox is suitable for the older type of GU multipoint locking mechanisms . It is  an easy to change gearbox and will swap over with just a starbit that comes free with the case.

The gearbox has a deadbolt and a latch, and the backset is available in a 30mm or 35mm backset.  Please check you have measured your backset correctly before ordering (See image below)

Please check your gearbox to make sure you have the old type. The biggest way of telling is the top corner is missing on the old type; to see the new type click here.

The latch is easily turned around to suit both left or right handed UPVC doors.









Simple steps to help you choose the right size backset for your Gearbox







The Backset size is A in the diagram

Measure from the the front of the main faceplate (A in the diagram) to the middle of the spindle hole. This measurement is taken when the gearbox is attached to the main front face plate.

Measurement B is the PZ Centre.





Frequently Asked Questions

You need to measure the pz (shown as “A” on our guide) and the backset (shown as “B” on our guide).
Click here to go to the guide.

This depends on your existing gearbox and whether an alternative is available and we always have to match up with the existing “holes” in your door. Call us on 01204 652211 and we can help you with this.

The most common bit used to remove a gear box is a torx t20 although in some instances a square drive can be used which can normally found in most drill bit sets.

A Dual spindle has 2 spindles at different heights. This means that the levers / moving parts of the door handle will be at different levels on the inside and outside. A Split spindle is made of 2 parts that meet inside the gearbox. The levers / moving parts of the door handle will be at the same level. A Single spindle is one long part which goes right through the door. The levers / moving parts of the door handle will be at the same level. To distinguish between a split and single spindle you will need to remove them from the door and look.

No, as you do not necessarily need to change the barrel when changing the gearbox so the gearbox is sold on its own own. If you need a new cylinder, please click here.

We try to put these guides on each gearbox page. If its not there please call us on 01204 652211 and we’ll find the instructions for you.

Unfortunately not all gearboxes can be purchased separately. Contact us if you can’t see your gearbox on our website and we can tell you if its available or not.

28 Reviews Hide Reviews Show Reviews

  • 4

    Posted by Saved cvsaa on Jul 08, 2019

    Excellent service and cooperation

  • 5
    A solid piece of equipment, fitting strait into the door.

    Posted by Walter Scott on Jun 17, 2019

    Detail to help order, ease of site and terrific customer service.

  • 5
    GU old type gearbox

    Posted by Paul Willisams on May 04, 2019

    First class product no problem to fit .... Many thanks

  • 5
    GU Replacement Gearbox with Deadbolt - OLD Style

    Posted by Smalley on Dec 11, 2018

    Quick delivery, fits and works perfectly and excellent value, Staff knowledgeable and helpful.
    Thank you.

  • 5
    Multi door lock

    Posted by George M on Nov 09, 2018

    Exellent product, would use again.

  • 5

    Posted by I G Rawlinson on Mar 21, 2018

    Ordered on line first class service, simple DIY job,
    See no reason it should not last 15 years as the original one.

  • 5
    Replacement lock for our French doors

    Posted by Eileen Spencer on Feb 01, 2018

    I emailed the office with the make of the French doors and asked for advice about getting the replacement piece. They replied straight away and asked me to send photos of the gearbox. I emailed the photos to them and they sent me back an email with a link to the gearbox we needed. I ordered the gearbox on the Tuesday and it arrived on the Thursday. What excellent customer service!

  • 5

    Posted by Nick Bains on Jan 15, 2018

    Excellent product backed by excellent customer service

  • 5
    gu gearbox with deadbolt

    Posted by chris on Jan 06, 2018

    great product very fast delivery very pleased