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99 GMC Suburban 4L60 problems Mitch 8-12-08  
1999 GMC Suburban, 159K mi
Towing last weekend. After 3+ hours, the tranny started to slip (4L60). Pulled over, placed in 2nd, and crept along. Then put it back in drive and acc to about 45 mph and it slipped again. Stopped. Back in 1st it pulled fwd. Then shifted and started slipping. Then no forward in any gear.

After you let it set for 10-20 min, it would go into gear, 1 and R and move for about 20 ft and as soon as any load was on it, it slipped.

The tranny was "rebuilt" by a shop about 40K mi ago and has had very light use sense.

Anything simple to check or just buy a rebuilt replace?

What about the torque converter? How do they work? Could it have worn out?
Re: 99 GMC Suburban 4L60 problems BUBBA THE BUS TECH 8-13-08  
Drop the Trany pan. If it is full of black silt, or worse yet black silt with specles of shiny metal its done like toast. Don't buy this one from the same place as last time. They do poor work. I could see it if it ran 100,000 and failed again. From the progresive nature of the symptoms it has torn a clutch out. Good Luck
Re: 99 GMC Suburban 4L60 problems Mitch 8-13-08  
Thanks Bubba. If its toast, where is a good place to buy a remanufactured tranny? I'm in Minnesota. A few years back we put a Jasper reman in a 2000 GMC and its still going strong. The rebuild on the 99 was done by Kennedy. I'd like to run the 99 another 150K and and I only want to fix it once.
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