KingPin_Chevy86
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So I had originally posted a few yrs ago about a problem that I was having with the TCC not kicking in when the outside temp was over 50* in my 1997 tahoe L31/4L60E. To make a long story short, the truck would act normal when you first start out in the morning but has the truck reaches opp temp and the outside temp was over 50* then the trans goes 1st, 2nd, 3rd, 4th, no lock up. then after you ride with no lock in 4th for a period of about 10-15 minutes, there would be a serious kick from 1st- 2nd, 2nd- 3rd, and third would slip hard. I found this article just screwing around on google trying to solve this as its becoming spring time and the temp here in NE Ohio is getting warmer. I needed to get this together. Granted the truck has 214,000 Miles but has been maintenanced like a senior at a nursing home so aside from the rust, its a pretty good truck. Heres the article I found:
My last truck was a 99 1/2 ton 4.8L with the 4L60E, I had the same problem. No trouble codes were set, so I took the dealers tranny guy for test drive, he brought along his tech 2 scan tool. As we were driving I told him what exactly happened and when. He picked it up on his scan tool right when I said it was going to pop out fo OD.
The problem was two fold, part of the problem was the tcc solonoid, the other half of the problem was the port on the valve body where the tcc solonoid seals off. See, the tcc solonoid is sort of a proportioning valve, it has a steel ball that opens and closes and that steel ball seals off on port in the aluminum valve body. See where I'm going here, , steel vs. aluminum? Any way, the steel ball starts to peen away the surface of the aluminum valve body, when the fluid gets warm (that's when mine did it) the fluid thins out some and leaks past this "improper" sealing surface and it messes with the line pressure.
The fix - the dealer pulled the vlave body and took it to a machine shop where they reamed out that port, installed a steel insert, so now the steel ball in the tcc solonoid can seal off on steel surface. $450.00 problem solved.
Also check out the TransGo SK4L60E kit, it has a fix for this problem in the kit. I just ordered the kit and will be installing it in the near future. I hope this post helps anyone out there that has been chasine their tail like I have for three yrs now.
My last truck was a 99 1/2 ton 4.8L with the 4L60E, I had the same problem. No trouble codes were set, so I took the dealers tranny guy for test drive, he brought along his tech 2 scan tool. As we were driving I told him what exactly happened and when. He picked it up on his scan tool right when I said it was going to pop out fo OD.
The problem was two fold, part of the problem was the tcc solonoid, the other half of the problem was the port on the valve body where the tcc solonoid seals off. See, the tcc solonoid is sort of a proportioning valve, it has a steel ball that opens and closes and that steel ball seals off on port in the aluminum valve body. See where I'm going here, , steel vs. aluminum? Any way, the steel ball starts to peen away the surface of the aluminum valve body, when the fluid gets warm (that's when mine did it) the fluid thins out some and leaks past this "improper" sealing surface and it messes with the line pressure.
The fix - the dealer pulled the vlave body and took it to a machine shop where they reamed out that port, installed a steel insert, so now the steel ball in the tcc solonoid can seal off on steel surface. $450.00 problem solved.
Also check out the TransGo SK4L60E kit, it has a fix for this problem in the kit. I just ordered the kit and will be installing it in the near future. I hope this post helps anyone out there that has been chasine their tail like I have for three yrs now.