rough shifting - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

apexi240sx · 11-03-2005, 02:22 AM

Can anyone figure out this one:

I installed a new Rps sport clutch, new throwout bearing, new pilot bushing i upgraded to a used s14 sr20 tranny, i filled it up w/ redline mt90 tranny fluid... 4 wks ago. Okay i drove it to vegas this past weekend, and when i was over there i noticed the shifting got rough... like it hesitates somewhat to put into gear, more at freeway speeds.... usually when i drive out of the driveway cold the shifting feels good but as the engine warms the shifting gets notcher... i checked the clutch master & slave cylinders and they are fine no leaks, fluid is at level, clutch pedal feels great, nice and stiff (uuhh that didnt sound right) like a sport clutch pressure plate should...im stumped on this one fellas anyone have any suggestions?!?!

honduh · 11-03-2005, 05:26 AM

might check your differential oil and change it, sometimes rough shifting is caused by the diff....if you have stock vlsd just go buy some mobil one synthetic 75w90? I cant remember the grade, but a quick search would tell you. I think you can use that for open diff's too, but don't quote me on that. good luck

apexi240sx · 11-04-2005, 03:20 AM

i dont think the differential has nothing to do with it.... well i added 1/4 of 80w-90 grade gl-4 generic gear oil, and it loosened up a bit, im running 75w-90 red line syn. oil..... it seems to like the thicker oil better.. idunno, i smell trial and error here.. like i wasted 30 bucks on redline "thin" oil!!

11-03-2005, 02:22 AM	#1
apexi240sx Zilvia Member Join Date: Sep 2004 Location: Las Vegas, NV, San Fernando Valley, CA Age: 43 Posts: 255 Trader Rating: (0) Feedback Score: 0 reviews	rough shifting Can anyone figure out this one: I installed a new Rps sport clutch, new throwout bearing, new pilot bushing i upgraded to a used s14 sr20 tranny, i filled it up w/ redline mt90 tranny fluid... 4 wks ago. Okay i drove it to vegas this past weekend, and when i was over there i noticed the shifting got rough... like it hesitates somewhat to put into gear, more at freeway speeds.... usually when i drive out of the driveway cold the shifting feels good but as the engine warms the shifting gets notcher... i checked the clutch master & slave cylinders and they are fine no leaks, fluid is at level, clutch pedal feels great, nice and stiff (uuhh that didnt sound right) like a sport clutch pressure plate should...im stumped on this one fellas anyone have any suggestions?!?!

11-04-2005, 03:20 AM	#3
apexi240sx Zilvia Member Join Date: Sep 2004 Location: Las Vegas, NV, San Fernando Valley, CA Age: 43 Posts: 255 Trader Rating: (0) Feedback Score: 0 reviews	thicker oil? i dont think the differential has nothing to do with it.... well i added 1/4 of 80w-90 grade gl-4 generic gear oil, and it loosened up a bit, im running 75w-90 red line syn. oil..... it seems to like the thicker oil better.. idunno, i smell trial and error here.. like i wasted 30 bucks on redline "thin" oil!!

11-03-2005, 05:26 AM	#2
honduh Leaky Injector Join Date: Oct 2004 Location: Indiana Age: 40 Posts: 99 Trader Rating: (0) Feedback Score: 0 reviews	might check your differential oil and change it, sometimes rough shifting is caused by the diff....if you have stock vlsd just go buy some mobil one synthetic 75w90? I cant remember the grade, but a quick search would tell you. I think you can use that for open diff's too, but don't quote me on that. good luck