T56 Grinds in 4th
07-22-2008, 10:09 AM
#1
T56 Grinds in 4th What could be the cause of this? I drained the trans fluid, and there was just some metal dust in it. Here's what happened.... need inputs.
I have about 410-420RWHP, 10 bolt rear w/ 4.10 gears. I have a built T56 that is supposed to handle 600RWHP.
Put 315's on the back wheels, and decided to do a burnout in front of my friend's house. The diff in the 10 bolt broke pretty much every tooth off.
I get a Dana 60 installed, and take the car for a test drive. Shift into 4th, and give substantial throttle (not WOT, little more than half) and there is a grinding sound from the tranny. It doesn't sound like it's out of gear though. Could the 10 bolt's death also have broken the tranny?
There is also a "clunk" in every gear, if it's not shifted slowly (ease off the clutch) but I think that is the tranny hitting the bottom of the car.
I have about 410-420RWHP, 10 bolt rear w/ 4.10 gears. I have a built T56 that is supposed to handle 600RWHP.
Put 315's on the back wheels, and decided to do a burnout in front of my friend's house. The diff in the 10 bolt broke pretty much every tooth off.
I get a Dana 60 installed, and take the car for a test drive. Shift into 4th, and give substantial throttle (not WOT, little more than half) and there is a grinding sound from the tranny. It doesn't sound like it's out of gear though. Could the 10 bolt's death also have broken the tranny?
There is also a "clunk" in every gear, if it's not shifted slowly (ease off the clutch) but I think that is the tranny hitting the bottom of the car.
07-24-2008, 10:43 PM
#5
Check the Transmission mount. If 4th gear is grinding as you shift then it is the synchros or blocker ring. If it continues after you have it in 4th gear; it is probably not the internals of the tranny. Besides; didn't you get a Stage II rebuild or something like that a year or so ago?? I would hate to think that new synchros and blocker rings burned up that fast. If that is indeed the case, I bet your clutch is dragging, therefore not fully disengaging as you shift.
07-28-2008, 04:41 PM
#8
Check the Transmission mount. If 4th gear is grinding as you shift then it is the synchros or blocker ring. If it continues after you have it in 4th gear; it is probably not the internals of the tranny. Besides; didn't you get a Stage II rebuild or something like that a year or so ago?? I would hate to think that new synchros and blocker rings burned up that fast. If that is indeed the case, I bet your clutch is dragging, therefore not fully disengaging as you shift.
07-29-2008, 12:38 PM
#10
Check the speedometer plug--that is easy enough. Sounds like something not related to shifting mechanism (synchros or blocker rings). Did you guys install a new pilot bushing when you put in the McLeod twin??
07-29-2008, 09:17 PM
#14
The pilot bushing (bearing?) should always be replaced when you do a new clutch. It is possible that when the rearend went enough vibration/pressure etc. was transfered through the transmission imput shaft and chewed up the pilot bushing (bearing?), But I would imagine that would make noise at all times; not just 4th gear.
