Alright, so I have a 2000 GMC K2500 (Classic) with a 4l80e, I've been having constant issues with it since I bought it. At first, the trans pan was leaking pretty bad, about a quart a day or so but it was my only vehicle so I just kept adding fluid and driving it. I've put a pan gasket on it, started to leak again after a day. Last week I went ahead and put all ACDelco parts on it, new pan, new gasket, new bolts, and new dipstick tube and it fixed the leak. Normally I only drive it about 15 minutes to work and 15 minutes back, it's been doing just fine. But today, I took my sister in law to school and it's about a 25 minute trip there, half way back it started shifting really hard from 1-2 and pretty rough 2-3, and has no overdrive. I checked the fluid, it's perfect. I've read a couple things but it's all for pre 92 models and I'm fairly certain stuff has changed since then, and I just need some advice. I have no idea where to start on this one.
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ak diesel driver
6.5 driver
Start by checking for codes.
Jaryd
Extremely Deplorable
Have you hooked a scanner to it. Some transmission codes won’t trigger the light in the dash
- Staff
- #5
What you describe sounds like limp mode. I limp mode it runs full line pressure and disables OD. You need to get a scanner on it to see if it set any history codes or if it's overheating and causing limp that way.