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420A Bolt-on Tech: Intake, exhaust, ignition, fuel system, cooling, etc - specific to 2G N/T DSMs. New Members must limit their 420A tech posts to this forum.

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Old 01-26-2004, 08:47 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #1 (permalink)
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Transmission grinding when down shifting only?


hey guys i got a 92 eclipse gs 5 speed, it was like this when i bought it but when i downshift, and only when downshifting, it grinds 1st and 2nd gear, i just got the car so i havent had time to do anything to the transmission but i plan to put the metal bushings under the plate and in the shifter linkage to replace the crappy rubber ones and also going to change the trans oil with bg synchro shift (should i use somthing else) and rebleed the clutch slave cylinder, my clutch is really soft with hardly any resistance so hopefully that will fix the clutch, if it doesnt what else could it be causing the clutch to be real soft, i wasnt sure if that was causing the grinding but if that were it then it would do it in every gear wouldnt it? thanks guys for your help, DSM's kick ass you just got to keep them up, i plan on buying a 92 eagle talon tsi awd with 5 speed in december i like there body style better witht he swirl side panels.


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Old 01-26-2004, 09:00 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #2 (permalink)
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Sounds like the syncros in the tranny, try to get the BG oil in there asap, it will extend the life of the syncros...

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Old 01-26-2004, 09:48 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #3 (permalink)
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i was afraid of that but i hope i can avoid it, will the fliud stop the grinding or only help it, and if it is the synchos how much do you think they are to replace, if i pull the tranny out myself and take it to the shop? you guys kick ass man ive never got this kinda response and help from other forums.

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Old 01-27-2004, 12:03 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #4 (permalink)
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i have a 92 GS as well, when i first bought the car it would grind while downshifting into second unless i was doing under 15 miles an hour when i put it into second. I knew it was a synchro problem from the start so i threw some GM SyncrhoMesh into my tranny to get as much from the worn synchros as i could. I gimped it for about 5 months before i broke down and tore the tranny apart....i ended up needing a full rebuild as the 1st/2nd gear synchros werent the only thing wrong..all in all i paid 1300 to have an entire rebuild done at a reputable shop here in town...that included an ENTIRE tranny rebuild...i even needed a new case as mine had a few small (hairline) cracks in it. as far as soft pedal pressure...the NT clutch is naturally soft as it isnt very strong (compared to a turbo) and its hydraulic (as apposed to a much stiffer cable system.) Bleeding the system would be a good start, it would at least put you back to stock pedal pressure (provided u let no air bubbles in) and give u an idea of where u should stand. it would also be a good idea with a new car anyways since u have no clue when the last time was that the last owner did it. U can also try adjusting the master cylinder clutch adjustment rod, this is a huge PITA to get to but also plays a HUGE role in pedal pressure, even very very fine adjustments can cause tremedous differences in clutch engagement (as in not right off the floor) and clutch pedal stiffness. theres a faq on it here... Clutch Adjustment ....the pics are from a 90 GSX but ull find everything to be almost (if not) exactly the same once u get ## head up under there. be sure u know what ## doing as to harsh an adjustment can kill your master cylinder as well as ## clutch in no time...hope this helps!


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Old 01-27-2004, 03:06 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #5 (permalink)
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Double-clutch.

And for god's sake, learn to throw in the occasional period.
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Old 01-30-2004, 07:42 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #6 (permalink)
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Could be the clutch master cylinder bad.

What i would do is downshift from 2nd to 1st from a 15mph and see if it grinds if it grinds then it could be the clutch master cylinder


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