replacing gears and syncro in a realtime trans

youngkipperyoungkipper Band Wagon
in Engine & Drivetrain
hello to all and thanks in advance for any advice and info.

Heres the deal, I got a 91 civic hatch, I converted it to the realtime 4wd, and turbo'd it and its making around 400hp. You can see the writeup on it on honda tech. Its epic tunings project. There are also some vids on youtube. All in all the trans and drivetrain are holding up awesome, although the syncros are starting to go as it grinds going into gear. I have a spare trans that I plan on taking apart and rebuilding, my question is should I keep the gears that are in it and just replace the syncros? Or is there a stronger gearset that would be better. I have heard that these transmissions are pretty strong and to be honest the gearing kinda works for me with the turbo setup. I really dont track this car at all, its mainly my street car that is dependable and I drive 3 times a week or so. Any advice would be greatly appreciated.

Thanks,
Ryan

Comments

  • red civic standardred civic standard familEE
    I have seen the car. Great project.

    You can have the gears heat treated to make them stronger. There is a company called Gearspeed that does that.

    Honestly, I think other stuff will break before the actual gears break.
  • davensdavens familEE
    I would think that cryo forging would be a good option.

    http://www.onecryo.com/motorsp.htm
  • evol911evol911 familEE
    Definitly keep the gears from the 4wd trans, they will keep your rpms above 3000 if you shift at 4000 which is great to keep your turbo spooled. If the only real damage you have done is wear out syncro's then I would just rebuild the tranny. Make sure the gears don't have any damage which I'm suspecting they should just have normal wear and tear. I vote for re-build :D No new gears.
  • youngkipperyoungkipper Band Wagon
    Thanks for all your help, like I said I like the gearing. its the grinding I dont like. Which I bet is just the syncos, the gears seem fine!!
  • JakerJaker familEE
    Often times, wear to the synchros (brass gears) leads to wear on the actual gear itself where the synchro teeth are (machined part of the actual steel gear).
  • DD Wagonist
    youngkipper wrote:
    my question is should I keep the gears that are in it and just replace the syncros?

    You need to disassemble and inspect the engagement dogs on the gears to see if you can get away with only replacing the brass synchro rings.
  • crx_jimcrx_jim Band Wagon
    Wher can i find Synchros and stuff to this gearbox? my i not good at all.. thanks
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