Rough Shift After Using O/d Over 60 Mph

[grattray]

Hi there,

 

I've got a GMC year 2000 model 2500 p/up 4X4 gas engine.

 

When I go over 60 mph using OverDrive, then when I slow down and it goes back to 3rd gear, subsequently it will go back to O/D as I speed up. When it shift back up, it's a slam hard shift.

 

If I slow to a stop, then it's a super slam hard shift from first to 2nd, and then the remaining upshifts.

 

Now, if I pull over and turn the motor off for a couple of minutes, then turn back on and go, it's fine as long as I don't get up to 60 mph. AND, if I leave it in 3rd gear without going into O/D, it's allright and the problem doesn't come up.

 

So, it's only in O/D and above 60 mph....

 

What to do?

 

Thanks,

 

Gordon J. Rattray

[grattray]

Mine's there all the time. If I go over 60 in O/D, then no doubt it's gonna happen.

 

For now, I'm just leaving it in 3rd all the time as these rough shifts can damage the transfer case. Better to spend a little more on gas than $2,000 for the transfer case plug whatever the problem is causing the rough shifts.

 

Gordon

 

Hi there,

 

I've got a GMC year 2000 model 2500 p/up 4X4 gas engine.

 

When I go over 60 mph using OverDrive, then when I slow down and it goes back to 3rd gear, subsequently it will go back to O/D as I speed up. When it shift back up, it's a slam hard shift.

 

If I slow to a stop, then it's a super slam hard shift from first to 2nd, and then the remaining upshifts.

 

Now, if I pull over and turn the motor off for a couple of minutes, then turn back on and go, it's fine as long as I don't get up to 60 mph. AND, if I leave it in 3rd gear without going into O/D, it's allright and the problem doesn't come up.

 

So, it's only in O/D and above 60 mph....

 

What to do?

 

Thanks,

 

Gordon J. Rattray

 

I have the same issue on my '99 1500 and it comes and goes, usually happens about 2-4 times a year, in the heat.

 

Curious to hear an answer.

 

[Johnshan]

Hi there,

 

I've got a GMC year 2000 model 2500 p/up 4X4 gas engine.

 

When I go over 60 mph using OverDrive, then when I slow down and it goes back to 3rd gear, subsequently it will go back to O/D as I speed up. When it shift back up, it's a slam hard shift.

 

If I slow to a stop, then it's a super slam hard shift from first to 2nd, and then the remaining upshifts.

 

Now, if I pull over and turn the motor off for a couple of minutes, then turn back on and go, it's fine as long as I don't get up to 60 mph. AND, if I leave it in 3rd gear without going into O/D, it's allright and the problem doesn't come up.

 

So, it's only in O/D and above 60 mph....

 

What to do?

 

Thanks,

 

Gordon J. Rattray

 

I have the same issue on my '99 1500 and it comes and goes, usually happens about 2-4 times a year, in the heat.

 

Curious to hear an answer.