grinds when shifting at high rev

[chaos2000]

so an exady stage 2 clutch came with my sr swap on my s13 and it shifted and drove fine for about 2-3 weeks now when i try and shift with the revs high it will grind. so i have to granny shift and let the revs go down before i can shift without grinding. i repalced both slave and master cylenders before the swap. so idk what the problem could be?

[Jables]

could be trans related.. does is it happen in every gear or just a select few?

[chaos2000]

it only does it when shifting into 2nd and 3rd putting it into 4th and 5th theres no problems.

[240zac]

you have a ka trans..... that is the problem... only way to prevent this is convert to a z32 trans

[chaos2000]

i used the sr transmission.

[adrianfromthecastle]

i used the sr transmission.

yep... sounds like the transmission's showing its age. Synchos are probably wearing out... unfortunately nothing lasts forever.

When was the last time you did a transmission oil change? Use synchromesh?

[thrasherx89]

my transmission does this as well only in second gear though

its a syncro, probably should just replace the transmission, good transmission fluid will help but it dosnt undo damage from time

[nifares240]

try adjusting your clutch.

[Jables]

you can try adjusting your pedal but if its only in select gears its not clutch related. It would have to do it in every gear to think it had something to do with release or actuation.

[chaos2000]

So should I just rebuild the transmission, use my sohc transmission or buy a new transmission?

[24j0hn]

it sounds like your synchronizers are worn and the side gears arent slowing down the gear enough so that your grinding

[AZ89two4Tsx]

Synchos are probably wearing out

This.

Try to avoid grinding as much as possible. You might have to start double clutching at those high revs.

[240zac]

So should I just rebuild the transmission, use my sohc transmission or buy a new transmission?

IMHO its not worth rebuilding an s-chassis trans. use the sohc one or just buy another trans...

fyi. the only difference between the ka and sr transmissions is the bellhousing.

the synchros are known to go out... i have only 2 240's that dont grind. both are low mileage transmissions for an sr... one is mine the other is my roommates... every other 240 i have driven grinds at some point in 2nd or 3rd gear

[AZ89two4Tsx]

the synchros are known to go out

[mrgrape]

yeah for me same problem though not oftenwhen im shifting from 2nd to 3rd it sometimes grinds.....and sometimes it grinds for a long time =[once its more persistent i plan to change the transmission with amsoil to help me fix the problem...can anyone back me up on that? should i change it ASAP or just soon but not now?

[JKL1031]

im grinding into third as well. if i shift a little slower and gentle, it wont. Synchros for me too? I should blip brap before going into third?

i also have to go to 2nd then first to not grind into first..sometimes.

[JKL1031]

Any ideas? What's synchromesh??

[benz88]

GM Synchromesh, its GM's trans fluid and is amazing stuff. Not sure if its GL4 though which these trans's need.

[JKL1031]

Is this an additive or a trans fluid that stands on its on?

[JKL1031]

Would i get the same result if i used castrol or lucas 75w-90 fluid instead of the amsoil? I cant find any amsoil close by.

[SX APPEAL]

im grinding into third as well. if i shift a little slower and gentle, it wont. Synchros for me too? I should blip brap before going into third?

i also have to go to 2nd then first to not grind into first..sometimes.

Yeah thats your syncros

Just for the record "blipping" and "double clutching" are used for downshifting only. If you blip the throttle or double clutch on an upshift you're working against yourself because you're increasing the speed of the input shaft when it needs to be slowing down, ie the RPM's drop when you shift to a higher gear. For downshifting these techniques are used to match the speed of the engine/input shaft to the wheels/output shaft, because the RPM's increase when you shift to a lower gear, get the picture?

[JKL1031]

How about amsoil 75w-110? Its all One guy has without me going to different dealers.

[allenms240]

What's the Syncromesh do exactly?
Sorry to steal the tread, but im trying to figure out why my friend's automatic transmission doesnt shift sometimes. Sometimes it will just rev without shifting when it's supposed to, what are some god additives for it?
Again, sorry for the TJ, I just don't want to make another topic :\

[JKL1031]

Good news sorta..Someone help me understand this synchro thing again.

Driving a little bit more, Ive found some tricks to my 3rd gear grind. I mentioned going to second before first to prevent grinding going back into first. now if i go to N back to 2, then 3rd(2nd, N, 2nd, 3rd), I wont grind. Unlike going in 2nd before going into first, i can go right into third without doubling second all the rest of the drive like the problem is fixed So is the third gear synchro getting out of line, and by doubling 2nd, im putting them back in line??? forever?? Weird.

Still going to try some amsoil. what can i expect then?

[JKL1031]

just went back out, shifted the car anyway i wanted to, and cudnt get it to grind once.

Should I continue to look into a short shifter?

[drumers13boy456]

id check your pilot bushing. i swaped auto to manual . and cause i listend to some idiot i didnt replace my pilot bushing. now youll get some noise that sounds like clutch chatter. then when you engage the clutch it stops. id check that. could be that your imput shaft has allot of play causing your clutch disk to move with it. cause i would grind second n third. put a manual one in and walla. no more grind. super old transmission to. good luck brother

[JKL1031]

I left my shop with 3 quarts and yet their asking for 2 more???

[JKL1031]

that s*** was $72!!!

[costa_rican13]

try the REDLINE MT90 transmission fluid.

[JKL1031]

Noo no more trans fluid changing