Gto ls2 in '86 Monte carlo ss
02-25-2017, 08:30 PM
#101
With the 411 pcm I wouldnt need a seperate tcm. I dont know, that projects a ways away.
Update on the t56: Got it back in the car and it seems to work great. I still have a vibration. I'm no longer getting the 70 mph and faster vibration, but on jack stands I get a vibration you can feel and hear, shakes the steering wheel. I had it before and its still there. With no brake drums or wheels and tires its the same. I sure seems like its in the rear axle. It goes away over 140 but I didnt go any faster then that. I adjusted pinion angle again with no change. The only original part in my rear axle are the axle bearings them selves at the ends of the tubes. Could wore axle bearings cause this? there is slight up/down movement of the axle shaft but I'm not sure whats normal. The pinion and carrier bearings are all new.
Update on the t56: Got it back in the car and it seems to work great. I still have a vibration. I'm no longer getting the 70 mph and faster vibration, but on jack stands I get a vibration you can feel and hear, shakes the steering wheel. I had it before and its still there. With no brake drums or wheels and tires its the same. I sure seems like its in the rear axle. It goes away over 140 but I didnt go any faster then that. I adjusted pinion angle again with no change. The only original part in my rear axle are the axle bearings them selves at the ends of the tubes. Could wore axle bearings cause this? there is slight up/down movement of the axle shaft but I'm not sure whats normal. The pinion and carrier bearings are all new.
02-25-2017, 10:08 PM
#104
cant hurt, but i have not seen that before.
i have seen bent axles flanges on brand new axles. do you have a mag base dial indicator to check run out? even a harbor freight cheapie will do the work
and flywheel and clutch looked good when you had the tranny pulled?
i know you had the DS just built right?
i have seen bent axles flanges on brand new axles. do you have a mag base dial indicator to check run out? even a harbor freight cheapie will do the work
and flywheel and clutch looked good when you had the tranny pulled?
i know you had the DS just built right?
02-25-2017, 10:21 PM
#105
Never pulled the pressure plate off the trans. brand new 1k miles ago and the vibration and harmonics is speed related. I can redline 1-4th with no vibration.
Driveshaft is brand new pst 3.5" aluminum whith a chromoly slip yoke, and strange chromoly pinion yoke.
I wish I could drive it to see what its like on the road/under load but its still snowing and shitty out up here. Buddy was watching the axle flanges and said the looked true while I was driving it on jack stands with no wheels/tires or brake drums on. I had vibration issues before the axle shafts also.
Driveshaft is brand new pst 3.5" aluminum whith a chromoly slip yoke, and strange chromoly pinion yoke.
I wish I could drive it to see what its like on the road/under load but its still snowing and shitty out up here. Buddy was watching the axle flanges and said the looked true while I was driving it on jack stands with no wheels/tires or brake drums on. I had vibration issues before the axle shafts also.
02-25-2017, 10:33 PM
#106
TECH Senior Member
iTrader: (7)
Have you checked your ujoint operating angles? Does the vibration make the rear view mirror blurry? Or is it more like thump...thump?
Things that vibrate and turn at wheel speed will have a much lower frequency than anything spinning at driveshaft speed.
Andrew
Things that vibrate and turn at wheel speed will have a much lower frequency than anything spinning at driveshaft speed.
Andrew
02-25-2017, 10:36 PM
#107
Mirrors blurry, steering wheel shakes fast. Ive fucked with the angles with no change. Shimmed the trans up as high as I could so its pointing down 3.5 degrees, and pinions pointing up 3.5 so the u joints are parallel. I tried pointing the pinion down further, putting it at 0* and 2* pinion up with no difference really.
02-25-2017, 10:40 PM
#108
TECH Senior Member
iTrader: (7)
If the steering wheel is shaking fast then it's in the front end. Check all the links, ball joints, check runout on brake rotors...bearings... Almost anything can cause this.
Andrew
Andrew
02-26-2017, 08:13 AM
#111
damn thats a head scratcher. it seems like the only place you havent touched is the pressure plate.
when you put the t56 bell on the block did you dial it in on the crank? I had a bad vibration once with a misaligned bellhousing. needed some offset pins
when you put the t56 bell on the block did you dial it in on the crank? I had a bad vibration once with a misaligned bellhousing. needed some offset pins
02-26-2017, 02:52 PM
#114
I didnt measure it. Would I be able to rule that out if it doesnt do it in 4th gear? The harmonics and vibes dont get bad until 120-140 on jack stands. I'm wondering if it wont be as bad under load out on the road? I guess time will tell.
02-26-2017, 03:07 PM
#115
quite possibly. what is your driveshaft speed in 4th gear at that speed. it just might be outside the critical speed for that diameter shaft.
and yeah especially with aluminum shafts they quiver a bit with no load on them.
found that put on my buddy's 280z. pulls nice and smooth to 120, depress the clutch and it would rattle your brain
and yeah especially with aluminum shafts they quiver a bit with no load on them.
found that put on my buddy's 280z. pulls nice and smooth to 120, depress the clutch and it would rattle your brain
02-26-2017, 03:29 PM
#117
http://spicerparts.com/calculators/d...rpm-calculator
enter your stuff in here and see what you get. it usually spits a conservative number IME
enter your stuff in here and see what you get. it usually spits a conservative number IME
02-26-2017, 03:38 PM
#120
yeah thats a critical speed of 10,000 haha so it probably not that. is it possible it got dinged in shipping?
i think my local drive shaft place charges me $25 to spin it and check
other than those axle bearings and the clutch im fully depleted of ideas
i think my local drive shaft place charges me $25 to spin it and check
other than those axle bearings and the clutch im fully depleted of ideas