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    Thread: Mk1 Rabbit Diesel 5 Speed Swap Question

    1. Member ddd8896's Avatar
      Join Date
      Jan 9th, 2012
      Posts
      504
      Vehicles
      2003 Jetta Wagon TDI, 2001 Jetta TDI, 1981 Caddy 1.6D, 1984 Jetta Coupe TD - all 5 speed
      08-28-2012 05:11 PM #1
      Currently, I have a 4 speed Trans Code "GL 13081". . . Its a dog. Id love to do a 5 speed swap within the next year and Ive been searching the forum for info about the swap. From what I can tell, the 020 FN,FH,FJ is a good trans to look for since I have the diesel. I found this link with the trans ratios and it raised a few questions for me.

      It looks like my GL trans is:

      1st - 3.45
      2nd - 1.75
      3rd - 1.06
      4th - 0.70

      with a final drive of 3.89

      The FN,FH,FJ Trans is :

      1st - 3.45
      2nd - 1.94
      3rd - 1.29
      4th - 0.91
      5th - 0.71

      with a final drive of 3.89

      -Will I run lower rpms on the highway? Im no expert but it looks to me like the rpms in the final gear of 4 speed and 5 speed is almost exactly the same.

      Any other suggestions or advise is appreciated. Thanks !
      Services: Contact me for a good price on Timing Belt installs including diesels, DSG Service, 2.0T De-Carb (Walnut Blasting), etc.
      Location : Charlotte, NC

    2. Member Broke's Avatar
      Join Date
      Aug 13th, 2001
      Location
      Columbus, Ohio
      Posts
      15,160
      Vehicles
      86 GTI 2.0L, 88 Scirocco 16V, 2010 F150 STX
      08-29-2012 07:58 PM #2
      Quote Originally Posted by ddd8896 View Post
      Currently, I have a 4 speed Trans Code "GL 13081". . . Its a dog. Id love to do a 5 speed swap within the next year and Ive been searching the forum for info about the swap. From what I can tell, the 020 FN,FH,FJ is a good trans to look for since I have the diesel. I found this link with the trans ratios and it raised a few questions for me.

      It looks like my GL trans is:

      1st - 3.45
      2nd - 1.75
      3rd - 1.06
      4th - 0.70

      with a final drive of 3.89

      The FN,FH,FJ Trans is :

      1st - 3.45
      2nd - 1.94
      3rd - 1.29
      4th - 0.91
      5th - 0.71

      with a final drive of 3.89

      -Will I run lower rpms on the highway? Im no expert but it looks to me like the rpms in the final gear of 4 speed and 5 speed is almost exactly the same.

      Any other suggestions or advise is appreciated. Thanks !
      You are correct, the 5 speed will NOT lower the freeway RPM compared to the trans you have now as the ratios are nearly the same. What the 5 speed does is to squeeze another gear into the mix between the shortest (1st 3.45) and the tallest (5th 0.71), it doesn't drop your overall final ratio (gear ratio x R&P ratio)

      A 5 speed might help it feel more peppy by allowing the engine to stay in a tighter RPM range between shifts. The jump between each gear is smaller with the 5 speed (5 steps between 3.45 and 0.71 versus 4 larger steps between the same end points of 3.45 and 0.71/0.70) so the engine RPM won't drop as much between each gear, and it won't have to work quite as hard pulling from gear to gear.
      020 trans info pages - www.BrokeVW.com
      NEW 0.7619 5th gears for the 020
      NEW 020 reverse gears
      '86 GTI 8V 2.0L -'88 Scirocco 16V - '10 F150 4x4

    3. Member ddd8896's Avatar
      Join Date
      Jan 9th, 2012
      Posts
      504
      Vehicles
      2003 Jetta Wagon TDI, 2001 Jetta TDI, 1981 Caddy 1.6D, 1984 Jetta Coupe TD - all 5 speed
      08-29-2012 08:15 PM #3
      Ok makes sense. I appreciate your feedback. Also, I love your website !
      Services: Contact me for a good price on Timing Belt installs including diesels, DSG Service, 2.0T De-Carb (Walnut Blasting), etc.
      Location : Charlotte, NC

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