Transfer clutch engages with a THUD
So now that its snowing here, I have discovered that after about a half-second delay my transfer clutch (and the rear wheels) engage with a thud sound.
I have been having a slight problem with my wheel sensors, my ABS will always kick on when I apply the brakes in reverse. So is that maybe why the transfer clutch engages so harshly maybe? I admit I dont know much about that part of our drivetrain, so any insight would help, thanks fellas! |
Re: Transfer clutch engages with a THUD
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The thud is a delay in the action between the TCU signal to the C solenoid and the transfer clutch piston applying pressure to the clutch. It allows the front wheels to start spinning, before the rear is engaged. It can be caused by the Transfer valve sticking in the valve body, needing more pilot pressure to move it. An oil pressure leak in the clutch cylinder. Or the actual clutch plates have worn down too much. It is this type of delay that breaks the clutch hub off the transfer gear, so I would not let it happen too much. Harvey. |
Re: Transfer clutch engages with a THUD
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Edit: Question, so how does the TCU detect the front wheels are spinning? |
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Re: Transfer clutch engages with a THUD
Chris, it's better to not let it be in FWD mode as the transfer clutch is much easier and cheaper to replace than the front diff. Transfer clutch replacement is about a 3 hour job, compared to about 10 or more billed hours for a diff replacement as the entire transmission must come out.
This was happening on my silver SVX before I pulled out the junk stock transmission and put in the 4.44's. As long as you are easy on the gas in slippery conditions, It will prevent the front diff from getting any abuse and the transfer clutch from getting any more damage. Just take it easy in the slippery conditions and when money allows for it, go ahead and get yourself a new or new to you complete transfer clutch assembly with the drum and replace it.:) |
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You could try some additive in the ATF, to see if it will free up the transfer valve, which is probably the cause of the delay.:) Harvey. |
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