70 C20 w/auto trans Rolls When in Park - The 1947 - Present Chevrolet & GMC Truck Message Board Network

CW4B · 05-06-2018, 01:06 AM

Truck rolls despite being in park. Even slightest incline/decline. Where do I start troubleshooting?

Just bought truck, rough shape, presently focused on getting it running and driving safely. One of many issues is that it rolls even on the slightest incline/decline despite being in "park." Emergency brake needs help too, but that's for another thread.

Thanks

**Steeveedee** · 05-06-2018, 12:06 PM

The linkage may just be out of adjustment. See if you can loosen it and rotate the crank on the trans a little further to lock it up. If not, the trans has to come apart to fix this.

CW4B · 05-06-2018, 12:23 PM

Quote:

Originally Posted by Steeveedee

The linkage may just be out of adjustment. See if you can loosen it and rotate the crank on the trans a little further to lock it up. If not, the trans has to come apart to fix this.

OK, will give that a try. Probably a transmission job given that the emergency brake peddle was broke off and hobbled back together with a small plate and some bolts after a bad weld job didn't work.

Thanks,

Bigdav160 · 05-06-2018, 12:49 PM

You might have to take the transmission pan off. I've seen the park linkage retainer bolts come off a couple times.

05-06-2018, 01:06 AM	#1
CW4B Registered User Join Date: May 2018 Location: San Antonio, TX Posts: 81	70 C20 w/auto trans Rolls When in Park Truck rolls despite being in park. Even slightest incline/decline. Where do I start troubleshooting? Just bought truck, rough shape, presently focused on getting it running and driving safely. One of many issues is that it rolls even on the slightest incline/decline despite being in "park." Emergency brake needs help too, but that's for another thread. Thanks

05-06-2018, 12:06 PM	#2
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,783	Re: 70 C20 w/auto trans Rolls When in Park The linkage may just be out of adjustment. See if you can loosen it and rotate the crank on the trans a little further to lock it up. If not, the trans has to come apart to fix this. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

05-06-2018, 12:49 PM	#4
Bigdav160 Registered User Join Date: Apr 2011 Location: Klein Texas Posts: 3,852	Re: 70 C20 w/auto trans Rolls When in Park You might have to take the transmission pan off. I've seen the park linkage retainer bolts come off a couple times. __________________ My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe



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