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| We can carry out repair work to most of the gearboxes used in the Vauxhall/Opel range including M32, M20, F23 and F40. The most common 'box that requires work is the M32, which is also shared across Fiat (Punto, Bravo, Croma), Alfa Romeo (147,159, MiTo, Brera) and Lotus Europa S models. |
| The M32 gearbox is used in many Vauxhall/Opel applications including Astra H VXR, 1.9 CDTi, 2.0 Turbo, the equivalent Zafira B models, Corsa D models including VXR and SRi Turbo, Astra J, Insignia, Meriva and Mokka . Where poorer quality gearbox oil is used this can often lead to premature bearing wear, causing noise and ultimately gearbox failure. Added to this an incorrectly shimmed gearbox (from new) will also contribute to bearing failure, as the bearings may well be subject to higher load, generating more heat within the 'box. Generally the normal process leading to bearing noise or failure is that the oil in the gearbox has got too hot during use. From our own monitoring on track, once the oil gets hot it does not cool down as the heat cannot get way. It is very easy to see temperatues way in excess of 125oC. The only way to cool the gearbox oil temperature is to stop the vehicle for a reasonable length of time to allow the heat to dissipate and the oil to cool down. Once the gearbox oil becomes too hot, it goes 'out of grade' and then no longer protects the internal bearings. With no protection or lubrication, but with continued use, the bearings run dry and get noisy, ultimately causing failure if not dealt with in good time. The worst case scenario is then complete breakdown and serious gearbox damage. There is no set or suggested gearbox oil change cycle either. You wouldn't leave hard working engine oil in a car engine for 3, 4, 5 or more years without changing it, so it is unfair expect gearbox oil to survive and to never be changed over a similar period of time. Our advice is to replace the factory fill gearbox oil with a high quality fully synthetic 75w-90 gearbox oil, such as Valvoline Synpower TDL 75w-90 API: GL 4/5 which we use and recommend and was our choice for the M32 'box in our Astra H VXR race cars or Amsoil MTG 75w-90 which performs exceptionally well under extreme use, such as track work. It is also then advisable to change the gearbox oil more frequently according to the vehicle's use. If you notice any whining (most common in 6th), unusual transmission noise, changes to transmission noise or additional movement of the gear lever in any gears (most often 1st, 3rd or 5th) then it is worth having the gearbox inspected and the problem rectified as soon as possible. Acting quickly will save further cost long term. |
| Whilst it is possible to replace just a single gearbox bearing by removing the end case, which may well solve an issue/whine it does not get the full gearbox internals inspected so for peace of mind it is worth replacing all the gearbox bearings at the same time. After all, the other bearings in the gearbox (if left unchanged) have still all covered the same mileage as any failed or failing bearing(s), so it is almost false economy to replace just one bearing and leave the others. |
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| We can offer a full rebuild service on the M32 gearbox. We will have the gearbox stripped, inspected, cleaned and have the internal gearbox bearings replaced and then the components are reassembled with new driveshaft oil seals. At the same time if any additional damaged or worn components are evident we can advise with regards to replacement. We use one of our own sourced bearing packs which includes bearings manufactured by SNR, Timken and GBC bearings. All are leading bearing manufacturers and suppliers to the Automotive Industry, both as Original Equipment OE and to the automotive Aftermarket. This service can be carried out by prior arrangement on any gearbox that is dropped off, or we can remove and refit the gearbox for you, and carry out the overhaul. Additionally this is the ideal time for considering a replacement clutch, flywheel, slave cylinder and/or fitting a limited slip differential. |
 Early End Case
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 Late End Case
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During the service life of the M32 gearbox, there has been a revision to the end case and end case bearings. |
As an option when having gearbox bearings replaced during an overhaul of an M32 gearbox with the early end case, we can supply a brand new genuine GM/Vauxhall/Opel revised end case with larger end case bearings as shown in the pictures above and in more detail below. This endcase upgrade can be carried out to any M32 gearbox fitted with an early endcase. |
 Late End Case
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| How to tell if you have the early or late endcase. Late Endcase: This can be identified by the additional oil galleries which are visible externally in the end case (arrowed in red in the picture to the right) and there is no level check plug at the front of the end case. Early Endcase: This can be identified by the lack of additional oil galleries which are visible externally in the end case and also by the level check plug at the front of the end case. Check the picture top right above. As a simple check: An M32 gearbox with an early endcase has a level check plug. The late endcase has no level check plug. |
 Late End Case
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We are also able to carry out rebuild/overhaul work on the M20 gearbox and F23 gearbox as used on the Astra G/Zafira A Turbo models although please be aware that parts are becoming harder to source for F23. F40 gearboxes have very limited parts availability. |
M32 Gearbox Bearing and Seal Kits from £114.00 - £198.00 |
| M32 Gearbox Overhaul and bearing replacement service. This includes strip down, clean and inspect, then replace bearings and driveshaft oil seals and rebuild the gearbox. Price from £595 plus bearing kit and any additional required parts. In most cases it is a straightforward bearing replacement job with existing components being serviceable. Price includes fitting cost of LSD if required. Choice of either Quaife or Wavetrac LSDs available at additional cost. Arrange with us in advance to have the work done, and either ship your gearbox to us or drop it off and we will carry out the overhaul for you. |
| We can carry out a one stop shop service as well, where we will remove and refit your gearbox as well as having it overhauled. Removal and Refitting of gearbox from £595 Corsa D/E - Astra G/H/J models Price includes fitting cost of replacement flywheel and clutch if required. Parts available at additional cost. |
Gearbox Oil Change M32 Gearbox using Fully Synthetic Millers CRX NT+ 75w-90 Gearbox oil from £135.00 |
Early M32 Endcase |
 Early Endcase Bearings |
 M32 Internals |
 M32 Endcase Removed |
 M32 Gearbox |
