Overdrive slipping....

HawgHunter · 03-12-2009, 07:06 AM

Well, as the title states, my overdrive is slipping....

It's a 97 C1500 with the 5.7 vortec. The fluid looked good when I changed it (and the filter) last month. But, as I'm driving down the Hwy at cruizing speed, my trans will slip back and forth in and out of overdrive????

When I bought it from my brother-in-law he said he had just had the trans rebuilt a few months before. So, maybe a bad rebuild?

I've also done a search on here and read that it could be some switch....but their problems differed a bit from mine....any help is appreciated

NonGoggleGuy · 03-12-2009, 07:14 AM

What tranny is it? Also, when it slips, do you lose the speedometer?

leolkfrm · 03-12-2009, 07:20 AM

Is it slipping in and out of overdrive or lockup? drive it down the road at about 55 and lightly hold the brake and see if it stops, push on the brake only hard enough to disengage the cruise if it was on

HawgHunter · 03-12-2009, 07:23 AM

Quote:

Originally Posted by NonGoggleGuy

What tranny is it? Also, when it slips, do you lose the speedometer?

To be honest, I don't know how to go about finding out what tranny it is.

I don't lose the speedometer thought. My RPM's jump up and down though.

mudseeker · 03-12-2009, 07:39 AM

the trans is a 4L60E and i would have to guess you are haveing a lockup problem. good possibility the converter didn't get replaced with the rebuild and the friction plate inside is toast.

HawgHunter · 03-12-2009, 07:44 AM

Quote:

Originally Posted by mudseeker

the trans is a 4L60E and i would have to guess you are haveing a lockup problem. good possibility the convertor didn't get replaced with the rebuild and the friction plate inside is toast.

Do you think that replacing just the friction plate would fix the problem, or just prolong it from happening again for a while?

mudseeker · 03-12-2009, 07:59 AM

friction plate is in the converter. whole converter would have to replaced if that's the problem.

HawgHunter · 03-12-2009, 08:05 AM

I'll have to get out and do that test when my oldest daughter decides to get up.

By running at 55 while slitly applying the brakes, what will this tell me if the problem does stop....?

leolkfrm · 03-12-2009, 08:44 AM

that it's torque converter lockup and not overdrive kicking in and out, should see less rpm diff. You could also change between drive and overdrive to help diagnose it

HawgHunter · 03-12-2009, 12:10 PM

Still haven't went out and tested it yet due to the rain....but I thought of something else that may be helpful....once the tranny warms up the slipping seems to go away.

03-12-2009, 07:06 AM	#1
HawgHunter Junior Member Join Date: Mar 2009 Posts: 26	Overdrive slipping.... Well, as the title states, my overdrive is slipping.... It's a 97 C1500 with the 5.7 vortec. The fluid looked good when I changed it (and the filter) last month. But, as I'm driving down the Hwy at cruizing speed, my trans will slip back and forth in and out of overdrive???? When I bought it from my brother-in-law he said he had just had the trans rebuilt a few months before. So, maybe a bad rebuild? I've also done a search on here and read that it could be some switch....but their problems differed a bit from mine....any help is appreciated

03-12-2009, 07:14 AM	#2
NonGoggleGuy Senior Member Join Date: Mar 2009 Location: New York State Posts: 259	What tranny is it? Also, when it slips, do you lose the speedometer? __________________ Bored? Check out Project: Wreck. - The NonGoggleGuy - I'm unbelievable... believe me.

03-12-2009, 07:20 AM	#3
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	Is it slipping in and out of overdrive or lockup? drive it down the road at about 55 and lightly hold the brake and see if it stops, push on the brake only hard enough to disengage the cruise if it was on __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

03-12-2009, 07:39 AM	#5
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 6,375	the trans is a 4L60E and i would have to guess you are haveing a lockup problem. good possibility the converter didn't get replaced with the rebuild and the friction plate inside is toast. __________________ i'd rather be hunting Last edited by mudseeker; 03-12-2009 at 07:59 AM.

03-12-2009, 07:59 AM	#7
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 6,375	friction plate is in the converter. whole converter would have to replaced if that's the problem. __________________ i'd rather be hunting

03-12-2009, 08:05 AM	#8
HawgHunter Junior Member Join Date: Mar 2009 Posts: 26	I'll have to get out and do that test when my oldest daughter decides to get up. By running at 55 while slitly applying the brakes, what will this tell me if the problem does stop....?

03-12-2009, 08:44 AM	#9
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	that it's torque converter lockup and not overdrive kicking in and out, should see less rpm diff. You could also change between drive and overdrive to help diagnose it __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

03-12-2009, 12:10 PM	#10
HawgHunter Junior Member Join Date: Mar 2009 Posts: 26	Still haven't went out and tested it yet due to the rain....but I thought of something else that may be helpful....once the tranny warms up the slipping seems to go away.

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