200-4R shudder - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Ronald29609 · 04-30-2017, 08:17 PM

I made a hard emergency stop that resulted in the engine/trans shuddering wildly like it was going to break off the mounts.
After driving 40 miles or so back home the shudder is greatly reduced but it is still there even in neutral.
Any ideas? Thanks in advance.
Ron

**dennislbrooks** · 05-01-2017, 08:18 AM

Maybe something to do with the lockup????

https://www.thoughtco.com/diagnosing...roblems-262653

Tom · 05-01-2017, 07:00 PM

Shudder in neutral? What makes you think its the trans then? Shudders only apply when the vehicle is moving IMO.

cadillac_al · 05-02-2017, 06:07 AM

Is this what happens when you don't have a brake switch to unlock the converter?

*YoungPup1977* · 05-02-2017, 07:24 AM

the brake switch does not control the TCC, the brake switch disengages the TCC when you press on brake when the TCC is engaged (applied).....

**dennislbrooks** · 05-02-2017, 07:37 AM

Be interesting to find out the problem. I run a relay off the brake switch thru a T- shifter switch to trans. Like having 5 gears. Hopefully ther is a cheap fix for Ronald. . Sounds like it could be a torque converter problem. Maybe some trans gurus will jump in.

D13 · 05-02-2017, 02:33 PM

Shuddering running in neutral, foot of the brake, on level ground?
You broke a mount, most likely.

Tom · 05-02-2017, 02:57 PM

Torque convertor clutch went bad after maybe 1000 miles on my old built 200-4r in a 79 c10 I had.

*YoungPup1977* · 05-02-2017, 10:31 PM

Drive it down to Albany on 87 at around 75 MPH and see if it still shudders when you get to Albany....If it does not shudder any more....issue fixed.

Ronald29609 · 09-22-2018, 12:48 PM

Thanks for the replies. I think it was carb flooding because after driving awhile it went away. Got a new carb and no problems since.

*YoungPup1977* · 09-24-2018, 08:35 AM

Glad you figured it out...
At any time during the "shudder" did you smell gasoline or notice smoke coming out of the tailpipe.....

when people hear the word shudder it appears they relate it to the TCC/trans....maybe it was running rough enough to feel like the engine was coming off the mounts.

04-30-2017, 08:17 PM	#1
Ronald29609 Registered User Join Date: Aug 2013 Location: Lake George, NY Posts: 30	200-4R shudder I made a hard emergency stop that resulted in the engine/trans shuddering wildly like it was going to break off the mounts. After driving 40 miles or so back home the shudder is greatly reduced but it is still there even in neutral. Any ideas? Thanks in advance. Ron

05-01-2017, 08:18 AM	#2
dennislbrooks Senior Member Join Date: Feb 2004 Location: Williamsburg, Ohio Posts: 1,787	Re: 200-4R shudder Maybe something to do with the lockup???? https://www.thoughtco.com/diagnosing...roblems-262653 __________________ 1942 Chevy 1/2 ton Rod, 1959 GMC 1/2 ton Fleet Stepside, 1967 Chevy SWB K10, 1985 Corvette Coupe 4+3, 2015 Chevy Duramax reg cab 4WD W/T

05-01-2017, 07:00 PM	#3
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,739	Re: 200-4R shudder Shudder in neutral? What makes you think its the trans then? Shudders only apply when the vehicle is moving IMO. __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.

05-02-2017, 06:07 AM	#4
cadillac_al Registered User Join Date: Oct 2013 Location: Maine Posts: 2,369	Re: 200-4R shudder Is this what happens when you don't have a brake switch to unlock the converter? __________________ 76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10

05-02-2017, 07:24 AM	#5
YoungPup1977 Account Suspended Join Date: Jun 2015 Location: No longer here Posts: 1,000	Re: 200-4R shudder the brake switch does not control the TCC, the brake switch disengages the TCC when you press on brake when the TCC is engaged (applied).....

05-02-2017, 07:37 AM	#6
dennislbrooks Senior Member Join Date: Feb 2004 Location: Williamsburg, Ohio Posts: 1,787	Re: 200-4R shudder Be interesting to find out the problem. I run a relay off the brake switch thru a T- shifter switch to trans. Like having 5 gears. Hopefully ther is a cheap fix for Ronald. . Sounds like it could be a torque converter problem. Maybe some trans gurus will jump in. __________________ 1942 Chevy 1/2 ton Rod, 1959 GMC 1/2 ton Fleet Stepside, 1967 Chevy SWB K10, 1985 Corvette Coupe 4+3, 2015 Chevy Duramax reg cab 4WD W/T Last edited by dennislbrooks; 05-02-2017 at 08:03 AM.

05-02-2017, 02:33 PM	#7
D13 Registered User Join Date: Feb 2007 Location: Memphis MI Posts: 1,851	Re: 200-4R shudder Shuddering running in neutral, foot of the brake, on level ground? You broke a mount, most likely. __________________ 1987 2 ton 1982 250/TH350 beater in progress Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping Plus a mess o' tractors

05-02-2017, 02:57 PM	#8
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,739	Re: 200-4R shudder Torque convertor clutch went bad after maybe 1000 miles on my old built 200-4r in a 79 c10 I had. __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.

05-02-2017, 10:31 PM	#9
YoungPup1977 Account Suspended Join Date: Jun 2015 Location: No longer here Posts: 1,000	Re: 200-4R shudder Drive it down to Albany on 87 at around 75 MPH and see if it still shudders when you get to Albany....If it does not shudder any more....issue fixed.

09-22-2018, 12:48 PM	#10
Ronald29609 Registered User Join Date: Aug 2013 Location: Lake George, NY Posts: 30	Re: 200-4R shudder Thanks for the replies. I think it was carb flooding because after driving awhile it went away. Got a new carb and no problems since.

09-24-2018, 08:35 AM	#11
YoungPup1977 Account Suspended Join Date: Jun 2015 Location: No longer here Posts: 1,000	Re: 200-4R shudder Glad you figured it out... At any time during the "shudder" did you smell gasoline or notice smoke coming out of the tailpipe..... when people hear the word shudder it appears they relate it to the TCC/trans....maybe it was running rough enough to feel like the engine was coming off the mounts.



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