BirdmanLS1

iTrader: (3)

Hey guys, here's the situation. I have about 100k miles on my car, i have no idea when the last time the previous owner replaced the clutch or anything with the car... when i first got my car last year i needed to replace the slave cylinder. I got a B&M short throw shifter and installed it myself. With my stock shifter and the B&M shifter, my car always seemed to grind everytime i try to shift quickly. This didnt happen when i first had the car but about 4 months ago it started happening. I also notice it happening more right when i start the car, then after 10 min or so of driving it doesnt happen as easily but still does grind. it happens mainly upshifting 1-2 2-3 and 3-4. 4-5 and 5-6 doesnt ever grind. Down shifting doesnt usually grind, but sometimes it does.

I asked some friends and they said that i might be shifting too quick for the trans, but i have a hard time believing that. Coould it be a clutch problem or maybe i need to rebuild my tranny? I would love any and all info on this cause the grinding is really an annoying problem.

chucky2

Maybe try something cheap, like a fluid swap? Just to see if it fixes your problem...

Here's a thread that discusses options on that: Which T56 fluid?

Just a thought...

Chuck

2000 TAWS6

iTrader: (1)

I agree first step is a trans fluid change. My own personal experience has found that plain old Dexron III ATF, non-synthetic shifts smoother than the expensive Royal Purple ATF.

If this does not help, I would get clutch looked at as it sounds like you are not getting complete dis-engagement which can cause the grind.

BirdmanLS1

iTrader: (3)

ok, thanks, ill try a swap of tranny fluid, which fluid do you personally recommend? is that new royal purple stuff any good or just some fancy new product that isnt any better than the rest?

2000 TAWS6

iTrader: (1)

I personally DO NOT recommend the Royal Purple, or any synthetic ATF. I use Advanced Auto Parts gallon bottle of Dexron III fluid.

As suggested, read this https://ls1tech.com/forums/showthread.php?t=290247.

2000Hawk

iTrader: (5)

I have the same grinding problem where it grinds when i shift but only happens when i go from 2-3. Usually when i first start up the car and sometimes when im running the car hard like racing.
-Joel

tracetrimble

search this site for "drill mod" to correct the 2-3 grind. GM put an orifice in the clutch line to create a sort of hydraulic delay in the clutch engagement. you drill this out, and the clutch action becomes much more crisp.

...and change the fluid anyway.