k11 gearbox identification.

hi everyone, I have a 1.0L k11 and the gearbox is getting increasingly noisy. Reading a Haynes manual it suggests that I have either a RS5F41A or RS5F30A gearbox. How do I tell which one I have? As I need to check the oil level before proceeding any further. Thanks for any help you can give me, Rob.
 
hi everyone, I have a 1.0L k11 and the gearbox is getting increasingly noisy. Reading a Haynes manual it suggests that I have either a RS5F41A or RS5F30A gearbox. How do I tell which one I have? As I need to check the oil level before proceeding any further. Thanks for any help you can give me, Rob.
Hi did you get an answer to the question, I've got exactly the same thing
 
Gearbox oil level is generally level with the fill plug on the side of the gearbox, the 41 was the early gearbox and is smaller, I think it had a smooth case without ribs.
 
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