Backlash in the Transaxle?

[maddog]

if its bouncing back and forth that much its sounds like clutch springs to me and the clunk is coming from normal amounts of backlash

when i get clutch chatter from my 6 puck my drivetrain clunks. everything is in spec so i just take it as is. it happens becasue the chatter is rapid and hard due to the 6 puck afaik

[eyeluvmy3kgt]

i have the same clunk as doctordex and i have replaced every part of my drivetrain from clutch to rear diff., except the tranny. (rear diff used and t-case used) and i'm reluctant to belive that a new tranny will fix it.

[DoctorDex]

According to the dealer the amount of backlash, measured at the ouput shaft is out of spec. The backlash measured at my OS = 0.015 and spec is 0 - 0.004.

Edit Apparently, the units of measurement in inches, so there was 0.015 thousands of an inch of backlash, where as spec. is 0 - 0.004 thousandths.

What could be giving me so much output shaft backlash? Worn gears?

Thanks again.

Declan

[keithmac]

I`d be inlclined to say the dealers haven`t adjusted the rear diff backlash correctly, in my understanding the propshaft would be unable to turn more than the specified amount if the diff was adjusted properly? You need to have a word with them about exactly what they did/ charged you for..

[DoctorDex]

I don't have time this weekend, but next weekend I'll measure the backlash at the differential to make sure it is within spec.. I have a feeling it may not be within spec either.

Declan

[eyeluvmy3kgt]

i checked the backlash at the rear diff and at first it looked like there was way too much, then I realized the halfshafts back there would start rotating when I turned the driveshaft more than a couple mm. So there really wasn't much play in the rear diff, it just seemed like a lot because there was some play in the rear axles too.

All you guys need to watch for that when you check.

[FWombat]

Originally Posted by eyeluvmy3kgt

i checked the backlash at the rear diff and at first it looked like there was way too much, then I realized the halfshafts back there would start rotating when I turned the driveshaft more than a couple mm. So there really wasn't much play in the rear diff, it just seemed like a lot because there was some play in the rear axles too.

All you guys need to watch for that when you check.

I noticed the same thing when I was checking for backlash. There was very little in the rear diff, but there was some movement in the rear axles.

[DoctorDex]

So does anybody have any idea, as to what component in my trans could me giving me an extra 13mm of backlash? Bearings, gears? If so, which ones would most likely be the most like culprit? The backlash is evident in all gears (1st to 5th), so I'm not sure which one worn transaxle component could cause these symptoms.

Declan

[KORMEX]

Originally Posted by DoctorDex

According to the dealer the amount of backlash, measured at the ouput shaft is out of spec. The backlash measured at my OS = 0.015 and spec is 0 - 0.004. I am assuming the units they used are in meters, so that would translate into normal values of 0 to 4mm and the backlash in my OS is 15mm (which is almost 4 times spec).

When I had the center diff apart, I measured that 2mm of slop was coming from the planetary gear assembly dowel pins & oversize VCU holes. That leaves me with a 13mm of unaccounted for output shaft backlash.

What could be giving me so much output shaft backlash? Worn gears?

Thanks again.

Declan

Where and how are they measuring Backlash on the output shaft ?
how much force is being applied ?
you see why I dont touch those numbers , to me they don't make much sense if I don't know how they where aquired.

[DoctorDex]

Originally Posted by KORMEX

Where and how are they measuring Backlash on the output shaft ?
how much force is being applied ?
you see why I dont touch those numbers , to me they don't make much sense if I don't know how they where aquired.

Just got off the phone with them. Apparently, the units of measurement was in inches, so there was 0.015 thousands of an inch of backlash, where as spec. is 0 - 0.004 thousandths. They measured the backlash at the output shaft using a dial indicator and a pair of vice grips to manual turn the output shaft.

I also quizzed them re: my propeller shaft and they said they didn't check to see if I had bad u-joints. Is there a way to check/test the u-joints on a driveshahft with it still on the car?

Thanks.

Declan

P.S. The clunk when going from decel (in gear) to accel seems to be worse in 5th. However, what is worse and what is better is really subjective...