Opel CIH 5 speed Options & Ratios - the R25

  • List of Opel CIH 5 speeds and ratios.


    Stock Opel 4 spd

    1st 3.428

    2nd 2.156

    3rd 1.366

    4th 1.000


    Getrag 240 5 speed ( Manta B, the smallest and easiest to install )


    1st 3.717

    2nd 2.019

    3rd 1.316

    4th 1.000

    5th 0.804



    R25 - Omega / Senator


    1st 3.95:1

    2nd 2.19:1

    3rd 1.39:1

    4th 1.00:1

    5th 0.84:1

    Rev 3.53:1


    Getrag 265 5 speed - Senator / Rekord ?


    1st 3.822

    2nd 2.200

    3rd 1.398

    4th 1.000

    5th 0.813


    ZF S5-18/3 - Kadett GTE ( very rare, very expensive.. BUT remanufacturer.. for about $8000.00)


    http://historicmotorsporttrans…x-with-synchromesh-gears/ )

    http://www.gr-box.sm/album/products-/#cambiozfopel-jpg


    1st 2.99

    2nd 1.76

    3rd 1.300

    4th 1.000

    5th 0.87


    I'm posting this as it wasnt easily found anywhere online.. now it will be


    Im also planning on trying to install the more common R25 into a GT soon.

    CURRENT :
    '05 Pontiac GTO - "Betty2"
    '71 Opel Kadett - 4 Door Sedan (Limo ) Model 36D - (2.0 L w/ EFI & Auto) - "Mary Ann"
    '74 Opel Manta - "Ben's Manta"
    '74 Opel Manta - "Atlas" ( 2.8L w/ 4whl Discs )[/size]

    PREVIOUS:
    2 Bitters (#491/#439), 1973 Commodore GS, 12+ Mantas, 4 GTs and a few Ascona & Kadetts