w58 drivetrain lash? (1986.5)

[1986.5supra_kid]

my 86.5 will lash as if the diff was wore out but there is no play inthe rear end. other possiblites are the center support bearing have free play,also the clutch pedal is low on the floor. it does disengage and engage properly,but when i accerlerate and deaccelerate or vice versa there is a notciable lash. i would appeciate the input.

 

[Nick M]

What do you mean "lash"? As in backlash of a differential? You can not measure it unless the diff cover is open.

 

[1986.5supra_kid]

the diff is not the problem. i have checked it. its not a lsd either. the lash happens when i let off the gas and get back on the gas.

 

[CyFi6]

I think you are talking about how it feels between accel/decel, lik eyou can feel it jerk as if there is a lot of play in the drivetrain. This is pretty much normal for any manual trans car as its a direct link between the engine and wheels, so you feel all the play thats between anything between the engine and the wheels (clutch disk, transmission, driveshaft, differential etc)

 

[Nick M]

the diff is not the problem. i have checked it. its not a lsd either. the lash happens when i let off the gas and get back on the gas.

I didn't say it is. I said what do you mean by "lash".

 

[1986.5supra_kid]

the car jerks hard between accel and deaccel, and i have driven other straight shifts and none of them where that bad. i have a 88 yota truck with twice the miles and the rear is wore out, but its nothing compared to the supra and how much lash it has. something is not right. the diff seems perfect and the DS seems solid to (u joints and all) but the center support bearing seems to have a good bit of play, also the clutch pedal is low to the floor to engage and disengage.

 

[Nick M]

Is the clutch slave leaking, or any place else? The hydraulic clutch is self adjusting up until your disc is nearly worn out.

So you get a clunk when accelerate and decelerate?

 

[1986.5supra_kid]

yeah its aclunk sound. that would b a bettr description of the sound

 

[Nick M]

Inspect all the mounts you can see, especially the trans. If you have the means, the clutch needs to be inspected. I didn't see if you say there is hydraulic fluid leaking from the clutch system.

 

[1986.5supra_kid]

well i jacked one wheel up and left park brake off, and put the trans in gear then rotated the one wheel and looked and listened for something. sounds to be comming from the front of trans. and it looks like the clutch master could be leaking a little but nothing terrible.

 

[Bigred1781]

I get the same clunk that your talking about. I have a LSD. I set the park brake and put the trans in gear, I could rotate the drive shaft about a 1/4 inch. The U-joints seem fine but the free play seems to come from the rear, but I'm not 100% sure. BTW I have a 1 piece aluminum drive shaft. Also I have some chatter from the clutch when I up shift or down shift. Do you hear a slight clicking noise from the rear while driving? It sounds like we have a similar problem, maybe we can help each other out.

 

[1986.5supra_kid]

that slight click could be a u joint. and my 1986.5 has numbers that say its a standard rear end. i think my problem could be coming from the center of my driveshaft. by the center support bearing where there split into 2 parts front and rear driveshaft.

 

[metaphysico]

Just pull the drive shaft out and test it. Two bolts on the center support bearing and four for on the diff, takes me 5 mins to pull mine. Then you can put it in a vice and properly test it. also you can then test the diff too for play/noise.

 

[87supraguy]

anyone else think it could be worn Splines on either the input or output shaft or maybe both? IMO i'm not sure if a worn carrier bearing will make a cluck sounds... maybe a whinning sound or vibration but a clunking sounds more like a the teeth on the D/S or Trans are maybe work and have small play in between the teeth... there really should be NO foward or backward lash on these Two piece Drivetrains or anything RWD with IRS cause there's no reason for it to move like a vehicle with a welded diff ... i could be wrong but this is why i think Splines ... rare for it to happen but, possible.


my .02

 

[MK3er]

Lash in a dif. will sound like a low hum from the rear. Take your jack and put it under the pumpkin and lift up the rear. put jack stands on the rear axle housing and remove jack. Make sure to block the front wheels and release e-brake while tans. is in neutral. Grab the driveshaft and turn it switching between counter and clockwise. If the u joints are bad youll have an area of travel the takes little effort to spin the driveshaft.

 

[1986.5supra_kid]

Awesome, thanks for input. somethin else to do this weekend. btw time wise how long does it typically take to install new struts in the tems model? (all 4)

 

[MK3er]

My noise is getting worse ill get some more info and hopefully pics soon after i tear out my drive train and run test on it all because i have a clunk but i dont think mine is as bad. At least i havent payed as much attention to it :/

 

[AJ'S 88NA]

Sounds like the center support bearing, they will "clunk" when they get worn.

 

[1986.5supra_kid]

i think im just gonna drop tranny and all drivetrain and install new clutch ie original clutch 130xxxmiles. and check all u joints and bearings. what is a good stage one or 2 clutch. im looking at a exedy on rockauto.com and thinkn bout gettng it.

 

[ScreaminSupra]

just was reading up on 87supraguys post, he pointed out possible of splines on the slip yolk could be worn. i have been told that if you take out the shaft and apply some high pressure grease (cv axle grease) on the slip yolk splines the grease will help reduce the noise. if this reduces the noise a new slip yolk is needed. just adding more possibilities