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Most JC5 boxes are interchangable. The only ones that will not fit are the gearboxes from the Laguna with the N7Q 2.0 16v Volvo engine fitted to them ( JC5 037 ) . There are several that will fit the F7R and F4R and they are all interchangable. The only difference with them is some of them will have ......
1 - speedo drive in the gearbox casing
2 - no speedo drive in the gearbox casing - blank ( the speedo reading is taken off the ABS system - the rear ABS sensor detects the revolutions of the rear hub turning thus giving you the speedo reading through the ABS computer )
If your car doesnt have ABS it is essential you buy a box with a speedo drive.
If it does have ABS either will fit. Be careful though as some JC5 boxes have a speedo drive and the car is also fitted with ABS.
They are all as poor as each other and there isnt a "stronger" box from another model that will fit a williams or a 172 - the only difference is a Kangoo or a clio diesel box will get you to 100 quicker but not much
Renault have a wonderful way of making things extremely complicated