01204 652211 or office@handlesandhinges.co.uk

GU Replacement Gearbox with Deadbolt - OLD Style

(54 reviews) Write a Review
DL-GBX-GU-Old (GUCASE35OLD) (5055621404169)
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  • GU Replacement Gearbox with Deadbolt - OLD Style
  • GU Replacement Gearbox with Deadbolt - OLD Style (Measurements)
  • GU Replacement Gearbox with Deadbolt - OLD Style
  • GU Replacement Gearbox with Deadbolt - OLD Style
£32.30 Inc. VAT
£26.92 Ex. VAT


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.

Measuring Guide


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.





360 Degree View

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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.

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Additional Information

Backset 30mm
Backset 35mm
Handle to Cylinder Size:
Locking Points:
1 Deadbolt, 1 Latch
Delivered for just £3.18
Single Spindle
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54 Reviews

  • 5
    Replacement door lock gearbox

    Posted by Phillip Row on Aug 13, 2023

    I found this website very helpful, full of all the information I needed including clear pictures of the door lock gearbox. Fast delivery, so I could install the lock system quickly myself.

  • 5
    GU gearbox

    Posted by Ken Naysmith on Jun 12, 2023

    Excellent replacement, easy to fit, works a treat.

  • 5
    Replacement part which sorted out door problem

    Posted by Gill on May 01, 2023

    Good service and good quality product

  • 4

    Posted by Bob on Feb 12, 2023

    Can’t fault supplier great service n prices my only issue is the product has a weak spring on the latch they keep breaking after 2/3 years needs upgrading

  • 5
    GU replacement gearbox

    Posted by Colin on Jan 26, 2023

    Relatively easy replacement of my old faulty gearbox. Door now latches closed as it should. Good description on the internet allowing me to order exactly what I required with a quick delivery - thanks.

  • 5
    Replacement lock unit

    Posted by Mr Graham Wells on Jul 09, 2022

    Good quality replacement and an easy fit after minor enlargement of deadbolt slot made in existing locke mechanism (over 27years old)

  • 5
    Perfect gearbox

    Posted by David Letford on Jul 06, 2022

    A perfect replacement gearbox for my doors, very easy to fit and align.

  • 5

    Posted by Paul Billson on May 20, 2022

    I am going to use this company again. They did exactly what it said on the tin. They delivered the correct part and saved me the price of a locksmith with his sharp intake of breath .

  • 5

    Posted by Umesh Dave on Mar 20, 2022

    Ordered a GU 'Gearbox' for over 20 years old door multi point lock on 16th Mar, arrived on 19th, fitted today 20th and all working fine. What has impressed me most is the starbit sent with it has saved me so much of my time and effort to find one. Alternative would have to buy one from a DYI place. Truly a customer service at it's best, I mean it. Also the web site is very friendly and very detailed without being too technical. You haven't just gained a loyal life time customer, I am going to be one of your sources of advertisement. A big thank you.

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