RKCRLR
Newbie
I have a 2000 7.4L K3500 with a 4L80e transmission.
Sometimes when I'm hauling a heavy load (truck camper) up a grade the truck won't downshift into a lower gear even if I move the gearshift lever to a lower position. The engine temperature may be a little above the middle mark on the gauge but it doesn't seem to be overheating. It only seems to happen after it's been driven for a while (and it doesn't always happen). The check engine light doesn't come on and there no codes stored after it happens. The truck/transmission runs fine other than this.
Any suggestions where to look?
I have Torque Pro and OBDLink MX+ adapter. I was going to monitor transmission temperature, input shaft speed, output shaft speed, and torque converter slip. Anything else I should look at?
Thanks
Sometimes when I'm hauling a heavy load (truck camper) up a grade the truck won't downshift into a lower gear even if I move the gearshift lever to a lower position. The engine temperature may be a little above the middle mark on the gauge but it doesn't seem to be overheating. It only seems to happen after it's been driven for a while (and it doesn't always happen). The check engine light doesn't come on and there no codes stored after it happens. The truck/transmission runs fine other than this.
Any suggestions where to look?
I have Torque Pro and OBDLink MX+ adapter. I was going to monitor transmission temperature, input shaft speed, output shaft speed, and torque converter slip. Anything else I should look at?
Thanks