camping man wrote:
The 4l80's have several weak links that need to be addressed . Boost valve, pressure overrun issues, main bolts that hold the courier assemblies in place. Those are just the ones I can remember , since I haven't rebuilt one in a few years now. Think transgo has the rebuild kit to fix those issues.
These are just some of the things boy racer firms offering 4L80E/4L85E
rated 1K ft/lbs or more address, but they are costly. From $4K to +$8K
Those boy racer forms dumped Jasper about 12 years ago and many said
sold, but never searched that. They were one of the standards for years though
Heat is the main enemy for any hydraulic coupled transmission, IMHO
Why always advise to keep the ATF temp as low as possible in it's spec
range, but am in the vast minority on that.
Especially going slow, like getting into a camping spot. Why having
4x4 and compound low is so helpful, but today's 4x4's can't have the
front diff disconnected in stock form. I do put it into 4x4 low, even
on pavement, as just a short distance and the scrubbing okay...hopefully...
Marty's thought of a new close ratio tranny with the double OD is a
consideration, but lots of work to get that working
Back to Burbman...hope Jasper comes through for you.
