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5th gear syncro and diffrential?

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Old 02-27-08, 12:03 PM
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5th gear syncro and diffrential?

Hello from Greece. I got a 1995 fd3s for the last 8 months
The gearbox seemed to me perfect but i raced once and lost 3d gear...and since then when i shift the 5th gear its scratches almost all time (except if i shift extremely extremely slow)
Also my differential "knocks" all the time when i leave the gas pedal and then i step on it again.... So i wanna get a new one too......

What will i need to fix the gearbox? do u have any links that i can order these parts ?
Also are there any kits that sell the internal parts of the differential or do u suggest any other one new??
i ve found a cheap OBX LSD for the fd3s....has anyone used it?
i used this on a honda i previous had and it was ok

thank u
Old 02-27-08, 12:11 PM
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The Synchro's are available via your local mazda dealer. 5th gear synchro part number is W501-17-725C. You might as well replace the spindle lock as well, part number is R501-17-476.

When you say "knocks" it sounds to me like you are describing the common rearend clunk. Rearend clunk is normally caused by pillowball bushings going bad. Again, you can get them from the Mazda dealer, part number is FD01-26-220. Sometimes the differential bushings go bad as well. Don't have a set of those in front of me though to give you the part number. Hope this helps.

Brent
Old 02-27-08, 12:47 PM
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the problem is that when i go lets say on 3d gear and 50km/h and i dont step on it....the whole body of the car moves front and back like i m steppin on the breaks and leave them instantly!!!! it keeps doin this until i accelerate again!
Old 02-27-08, 05:11 PM
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i dont know what 50km/hr comes out to be, but maybe your just not shifting at the appropriate time??
Old 02-27-08, 05:32 PM
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50 kmh is about 31 mph, but if you were shifting too early, the car would jerk like that until the appropriate rpms were met.

accidently did it in my brother's FD since mine is auto.
Old 02-27-08, 06:19 PM
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If you have noise when you step on the throttle, check the differential bushings, powerplant frame, and motor mounts.

Pillowballs tend to clunk or pop when the car has been sitting still and you first move the car.

Dave
Old 02-27-08, 06:51 PM
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Originally Posted by teri064
Also my differential "knocks" all the time when i leave the gas pedal and then i step on it again.... So i wanna get a new one too......
I had the same problem. I thought it was my diff but it was my drive shaft. Pull your driveshaft out and wiggle the ends. See if they move freely. Good luck with you car!
Old 03-26-08, 01:00 PM
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I know what you're talking about. I have the same issue on mine. It almost seems like there is too much backlash between the ring and pinon gears but I'm not sure if it can be fixed by resetting the backlash or not.

I plan on checking mine out while I'm waiting on my motor to be built here in the next few months. I'm assuming the FSM will have the procedure in it for this but I haven't checked that yet either.
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