Triumph Spitfire Overdrive Unit

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    4176Overdrive Unit - J TypeOverdrive Unit - J TypeRKC684ROut of stock expected Add to cart and Back Order
    Price Match

    £391.67 ex VAT (Outside EU)   £470.00 inc (20%) UK VAT£350.00 ex VAT (Outside EU)   £420.00 inc (20%) UK VAT
    Product Description

    Triumph Spitfire Overdrive Unit
    J Type Overdrives
    Important Information
    Which Models have J type overdrive?

    MkIV Spitfires from FH60001

    All MkIVs were fitted with the 3-rail type gearbox.

    Spitfire 1500s
    All UK spec 1500s were fitted with the single-rail type gearbox. However, because USA specification vehicles had the 1500cc engine sometime before the UK and other export countries. It is possible that there are some re-imported 1500s that have a 3-rail type gearbox fitted as standard.

    Are they the same overdrive unit? No.
    Are all the parts interchangeable? No.
    Are the Adaptor Plates the same? No.

    Although outwardly they appear the same (as are the vast majority of components), overdrive units for the 1500 (with single rail gearbox) were fitted with a much improved Oil Pressure Relief Valve system, which cannot be fitted to the original spec. MkIV J type overdrive used on a 3-rail type gearboxes. Also, due to the different gear selector system and gear level mounting, 3-rail type gearboxes and single rail type gearboxes each have their own specific overdrive to gearbox adaptor plate.

    Can I fit a 1500 unit to a MkIV?
    Should I fit a MkIV unit to a 1500?

    Our reconditioned (exchange) J type overdrive units are suitable for both single rail and 3-rail type gearboxes, but you must use the correct gearbox adaptor plate.

    Reconditioned exchange overdrive units are supplies less solenoid, output flange, adaptor plate & speedo drive.

    Customer Comments
    "Service up to usual high standard." Customer Comment February '16