Re: [Chrysler300] Sudden drive train lock-up
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Re: [Chrysler300] Sudden drive train lock-up

Chris, Good to hear from you!~  I suspected that initially, and it has been brought up before. I cycled the parking brake several times and it worked fine. I have recently installed a new cable and brake shoe  so am pretty familiar with its condition. Also, when I removed the drive shaft to inspect the U joints, I did turn the e-brake drum back and forth. There is no grinding  or rubbing so I believe it is ok and see no reason to disassemble it. 
I remain suspicious of the Sure-Grip clutches in the diff as I had a problem a couple of years ago with them seizing up and causing a similar jarring and shaking of the car as though something was locking up-except I was driving. 

I thought the R&R of the lubricant along with adding the corrective Mopar ointment had solved it, but who knows. Randy’s can install a new clutch pack plus replace all the bearings and seals.This car has well over 300,000 miles on it.  (I contacted Randy’s Ring and Pinion in Everett a while ago and am currently planning on pulling the axles, then the diff and shipping it to them to inspect and refurbish.)  
Best, Mike Moore

On Nov 2, 2015, at 1:29 PM, kmaniak@xxxxxxx wrote:

Hi Mike:
I have read through quite a bit of replies that have speculated about the differential, the rear service brakes, and the front service brakes.  Nowhere have I seen anyone comment on your parking brake.  As the owner of a 1962 300, I am fully aware that the parking brake on a 1962 Chrysler does not use the rear service brake shoes and drums the way my 1964's do.  The parking brake in a 1962 Chrysler is a single drum unit with two small brake shoes that is attached to the tailshaft of the transmission.  If the parking brake unit locks up, the driveshaft will not turn and neither will the rear wheels.  Have you ruled out the parking brake as a culprit?
Chris the K MANIAC
-----Original Message-----
From: Michael Moore mmoore8425@xxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx>
To: Mike Moore <mmoore8425@xxxxxxx>
Cc: Chrysler 300 List <Chrysler300@xxxxxxxxxxxxxxx>
Sent: Sun, Nov 1, 2015 8:26 pm
Subject: [Chrysler300] Sudden drive train lock-up

 When I backed it up, after approx 3 ft the drive locked up sharply, as though I had hit something. But I hadn’t,  and all 4 wheels were clear. It did the same thing going forward-locking up after just a few feet.I did this several times and the distances prior to lockup seemed the same.
I was able to give it a lot of gas and slowly it would move, but something was straining.

This afternoon, after completing new starter motor installation, I dropped the driveshaft to have a suspect rear U-joint replaced tomorrow, but I see nothing which looked like it was hitting.
On jack stands under the axle, I also am able to rotate both rear wheels in either direction continuously without a lock up. My next step is to remove both rear drums and ensure there are no  broken  brake springs, but if I don’t see anything there, I have no idea where to look next. There are no unusual noises when I rotate the wheels.
Any suggestions?

Thanks, MIke Moore


Posted by: Michael Moore <mmoore8425@xxxxxxx>

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