jumps and hops going into reverse - The 1947 - Present Chevrolet & GMC Truck Message Board Network

DIGoogs · 09-18-2003, 08:19 PM

My 67, 6 cyl, manual, C30 hops and jumps when releasing the clutch in reverse. as in - it is never smooth starting in reverse.

It has been doing that as long as I can remember, even after a full clutch job and some work in the tranny.

Are we loooking at the nature of beast?

jef5150 · 09-18-2003, 08:35 PM

mine does the same thing,,,,69,6cyl,4-speed.....jeff

1972ChevyGuy · 09-18-2003, 09:56 PM

I remember a post about this not too long ago, too bad i can't remember what it said

Wheel hop maybe? I beleive I remember something about the rear-end moves a touch when you go backward and it does something... (bad memory)

Jefe · 09-18-2003, 10:18 PM

Clutch is warped slightly.

Douglas.

*Shane* · 09-18-2003, 10:48 PM

you guys have coil springs? right?

1972ChevyGuy · 09-18-2003, 11:04 PM

Mine does it and yes, coils. Thats what it was, but I still dont remember the solution

gr8scott51 · 09-18-2003, 11:14 PM

A new clutch will do wonders. Even with coil springs.

good luck, scott

DIGoogs · 09-19-2003, 07:35 AM

Thanks for all the "get backs"

I did put a new clutch and all the other stuff not long ago (at least as far as mileage) If the clutch did take a slight warp, I would think I would feel something in forward gears? Which I don't ....... make sense?

It’s not a showstopper but ever try to parallel park a 9 foot bed with the thing hopping and jumping and no power steering
(I know, stop whining!!)
I feel like I’m about to take out one guy’s left rear corner panel, the other guy’s front bumper and any nearby parking meters while my head is bouncing back and forth off the windshield
(not that bad!! but ....)

hahaha

tom hand · 09-19-2003, 08:47 AM

I would say you have two problems at work here. First your clutch is not as smooth as it should be...did you have the flywheel surfaced when you replaced the clutch? Did you replace the pilot bearing?...makes a huge difference. Second you have some slack in your driveline. Motor mounts,transmission mounts,u-joints, even slack in the ring and pinion...when you put in reverce all this slack is taken up because every thing gets moved in the opposite direction. Fix the clutch first.

jimfulco · 09-20-2003, 01:37 PM

My '69 used to do that so bad the hood would vibrate in synch with it so loud it would wake the dead. I replaced the rear motor mounts & it's much better now.

DIGoogs · 09-21-2003, 01:54 PM

Thanks guys - all good advice:

I have to add, the thing does sit for long periods (I know I should get it out more) so I think the flywheel & pressure plate may build up surface rust. I should drive it hard for a week or so.

When I get back under there, I'll give all the good things above a look.

The one thing I love about this truck, it is so easy to work on.

Longhorn Man · 09-21-2003, 02:20 PM

Give the motor mounts a real good looking at.
With the hood open and the parking brake on (and no one in the way) Put the truck in reverse and look at the engine as you ease the clutch out. If the engine looks like it is about to pop out and land in the driveway, then you are in need of new mounts.
The fact that your truck doesn't do the jumping act in first gear tells me that the clutch adnd flywheel are fine.

09-18-2003, 08:19 PM	#1
DIGoogs Registered User Join Date: Sep 2003 Location: New Jersey Posts: 9	jumps and hops going into reverse My 67, 6 cyl, manual, C30 hops and jumps when releasing the clutch in reverse. as in - it is never smooth starting in reverse. It has been doing that as long as I can remember, even after a full clutch job and some work in the tranny. Are we loooking at the nature of beast?

09-18-2003, 08:35 PM	#2
jef5150 Inline 69 Join Date: Apr 2003 Location: valleysprings,california Posts: 1,018	mine does the same thing,,,,69,6cyl,4-speed.....jeff Last edited by jef5150; 09-18-2003 at 08:38 PM.

09-18-2003, 10:18 PM	#4
Jefe Registered User Join Date: Jul 2000 Location: Chandler, Arizona, USA Posts: 299	Clutch is warped slightly. Douglas. __________________ -1968 Chevy SWB = Frame Off/383/Muncie Car 4 speed -1968 Chevy SWB = numbers matching 307/Truck 4 speed. -1966 Chevy II = 2 door No Post/130,000 Orig miles/230 6cyl/powerglide/Vintage AC -1972 Chevy Nova = 2 door/412 Small Block -1927 Ford Roadster = Homebuilt/widened 8"/350/ Custom Everything.

09-18-2003, 11:14 PM	#7
gr8scott51 Registered User Join Date: Mar 2003 Location: Bremerton, WA Posts: 1,839	clutch A new clutch will do wonders. Even with coil springs. good luck, scott __________________ Silence is golden, duct tape is silver. - Scott

09-19-2003, 08:47 AM	#9
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	I would say you have two problems at work here. First your clutch is not as smooth as it should be...did you have the flywheel surfaced when you replaced the clutch? Did you replace the pilot bearing?...makes a huge difference. Second you have some slack in your driveline. Motor mounts,transmission mounts,u-joints, even slack in the ring and pinion...when you put in reverce all this slack is taken up because every thing gets moved in the opposite direction. Fix the clutch first. __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS

09-18-2003, 09:56 PM	#3
1972ChevyGuy Registered User Join Date: Nov 2002 Location: Kannapolis, NC Posts: 552	I remember a post about this not too long ago, too bad i can't remember what it said Wheel hop maybe? I beleive I remember something about the rear-end moves a touch when you go backward and it does something... (bad memory)

09-18-2003, 10:48 PM	#5
Shane Account Suspended Join Date: Jun 2000 Location: over yonder Posts: 14,270	you guys have coil springs? right?

09-18-2003, 11:04 PM	#6
1972ChevyGuy Registered User Join Date: Nov 2002 Location: Kannapolis, NC Posts: 552	Mine does it and yes, coils. Thats what it was, but I still dont remember the solution

09-19-2003, 07:35 AM	#8
DIGoogs Registered User Join Date: Sep 2003 Location: New Jersey Posts: 9	Thanks for all the "get backs" I did put a new clutch and all the other stuff not long ago (at least as far as mileage) If the clutch did take a slight warp, I would think I would feel something in forward gears? Which I don't ....... make sense? It’s not a showstopper but ever try to parallel park a 9 foot bed with the thing hopping and jumping and no power steering (I know, stop whining!!) I feel like I’m about to take out one guy’s left rear corner panel, the other guy’s front bumper and any nearby parking meters while my head is bouncing back and forth off the windshield (not that bad!! but ....) hahaha

09-20-2003, 01:37 PM	#10
jimfulco Registered User Join Date: May 2003 Location: Shreveport LA Posts: 3,170	My '69 used to do that so bad the hood would vibrate in synch with it so loud it would wake the dead. I replaced the rear motor mounts & it's much better now.

09-21-2003, 01:54 PM	#11
DIGoogs Registered User Join Date: Sep 2003 Location: New Jersey Posts: 9	Thanks guys - all good advice: I have to add, the thing does sit for long periods (I know I should get it out more) so I think the flywheel & pressure plate may build up surface rust. I should drive it hard for a week or so. When I get back under there, I'll give all the good things above a look. The one thing I love about this truck, it is so easy to work on.

09-21-2003, 02:20 PM	#12
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Give the motor mounts a real good looking at. With the hood open and the parking brake on (and no one in the way) Put the truck in reverse and look at the engine as you ease the clutch out. If the engine looks like it is about to pop out and land in the driveway, then you are in need of new mounts. The fact that your truck doesn't do the jumping act in first gear tells me that the clutch adnd flywheel are fine.



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