Column shifter jumps upon acceleration - The 1947 - Present Chevrolet & GMC Truck Message Board Network

66clow · 01-14-2017, 08:47 AM

What might cause my column shifter to jump on initial acceleration in drive gear? It does not jump out of gear, the shifter column (handle and attached column) flops.

Thanks

James the III · 01-14-2017, 09:10 AM

broken motor mount.

kaycee · 01-14-2017, 10:27 AM

Transmission or motor mount

hamjet · 01-14-2017, 11:54 AM

I don't know the shape of your truck, but worn , broken cab mounts will do it also..

**Boog** · 01-14-2017, 12:14 PM

Also incorrect auto shifter linkage will cause it to move. The correct linkage uses a bell crank from frame rail to trans. Short story is as the engine and trans torques over on acceleration it moves the linkage upward too thereby moving the shift lever. Over the years the original shift linkage may have been lost and a direct shift rod used instead. It works. Just not like original.
I don't have pics with me but you can search for auto shift linkage and see pics of what the right linkage looks like.

66clow · 01-14-2017, 12:19 PM

Quote:

Originally Posted by Boog

Also incorrect auto shifter linkage will cause it to move. The correct linkage uses a bell crank from frame rail to trans. Short story is as the engine and trans torques over on acceleration it moves the linkage upward too thereby moving the shift lever. Over the years the original shift linkage may have been lost and a direct shift rod used instead. It works. Just not like original.

I'm starting to think it may be my linkage. Not too long ago I tried adjusting it so the indicator lined up. Later to realize the indicator I have is the wrong indicator for my trans. I'll start there, may be too tight. Thanks

**Boog** · 01-14-2017, 12:48 PM

I found this thread. There are many.

http://www.67-72chevytrucks.com/vboa...+shift+linkage

The pics are of the oe linkage. I think you can see how it works to control the torque movement vs the shifter. There are aftermarket linkages that are of the direct rod type and they do work but there is the lever movement issue upon acceleration.

Shady Rascal · 01-14-2017, 09:08 PM

Motor mount is my guess.

It's easy to check. Open hood. Start engine and hold your foot on the brake pedal. Then drop it in drive and goose the throttle whilst holding the brakes hard. Watch to see if the engine moves around when you go from park to drive.

66clow · 03-19-2017, 06:33 PM

Found my problem. PO left bolt out or didn't install. Does it use just a bolt or a Bolt & Nut? 350 and I know about the power steering crazy bolt set up

CaptRMW · 03-20-2017, 09:23 AM

The bolt is a 7/16" std. thread about 1" long with a thick flat washer or just use 2 regular flat washers and a lock washer. These bolts are often a pain in the shorts to get in if the holes were not enlarged to at least 9/16". Good luck, Capt.

66clow · 03-20-2017, 09:25 AM

Quote:

Originally Posted by CaptRMW

The bolt is a 7/16" std. thread about 1" long with a thick flat washer or just use 2 regular flat washers and a lock washer. These bolts are often a pain in the shorts to get in if the holes were not enlarged to at least 9/16". Good luck, Capt.

Thank you fellow floridian!

01-14-2017, 08:47 AM	#1
66clow Registered User Join Date: Jun 2012 Location: Clearwater Beach Florida Posts: 872	Column shifter jumps upon acceleration What might cause my column shifter to jump on initial acceleration in drive gear? It does not jump out of gear, the shifter column (handle and attached column) flops. Thanks

01-14-2017, 09:10 AM	#2
James the III Registered User Join Date: Nov 2016 Location: lowell ma Posts: 750	Re: Column shifter jumps upon acceleration broken motor mount.

01-14-2017, 10:27 AM	#3
kaycee Registered User Join Date: Jan 2000 Location: Wyoming USA Posts: 2,449	Re: Column shifter jumps upon acceleration Transmission or motor mount __________________ 2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327

01-14-2017, 11:54 AM	#4
hamjet Registered User Join Date: Apr 2013 Location: South Westerlo, New York Posts: 1,325	Re: Column shifter jumps upon acceleration I don't know the shape of your truck, but worn , broken cab mounts will do it also.. __________________ Thanks, Joe.. 1969 C/10, 348 C.I., 3X2 bbl. V8, 2004r , LWB.

01-14-2017, 12:14 PM	#5
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,514	Re: Column shifter jumps upon acceleration Also incorrect auto shifter linkage will cause it to move. The correct linkage uses a bell crank from frame rail to trans. Short story is as the engine and trans torques over on acceleration it moves the linkage upward too thereby moving the shift lever. Over the years the original shift linkage may have been lost and a direct shift rod used instead. It works. Just not like original. I don't have pics with me but you can search for auto shift linkage and see pics of what the right linkage looks like. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

01-14-2017, 12:48 PM	#7
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,514	Re: Column shifter jumps upon acceleration I found this thread. There are many. http://www.67-72chevytrucks.com/vboa...+shift+linkage The pics are of the oe linkage. I think you can see how it works to control the torque movement vs the shifter. There are aftermarket linkages that are of the direct rod type and they do work but there is the lever movement issue upon acceleration. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross Last edited by Boog; 01-14-2017 at 12:54 PM.

01-14-2017, 09:08 PM	#8
Shady Rascal Registered User Join Date: Feb 2016 Location: Weatherford Texas Posts: 306	Re: Column shifter jumps upon acceleration Motor mount is my guess. It's easy to check. Open hood. Start engine and hold your foot on the brake pedal. Then drop it in drive and goose the throttle whilst holding the brakes hard. Watch to see if the engine moves around when you go from park to drive.

03-19-2017, 06:33 PM	#9
66clow Registered User Join Date: Jun 2012 Location: Clearwater Beach Florida Posts: 872	Re: Column shifter jumps upon acceleration Found my problem. PO left bolt out or didn't install. Does it use just a bolt or a Bolt & Nut? 350 and I know about the power steering crazy bolt set up

03-20-2017, 09:23 AM	#10
CaptRMW Custom Sport W/T Join Date: Nov 2010 Location: Tarpon Springs,Fl & Annapolis,Md. ....................Quaint drinking villages with a fishing problem Posts: 898	Re: Column shifter jumps upon acceleration The bolt is a 7/16" std. thread about 1" long with a thick flat washer or just use 2 regular flat washers and a lock washer. These bolts are often a pain in the shorts to get in if the holes were not enlarged to at least 9/16". Good luck, Capt.



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