$0E / $31 XDF Missing transmission parameters.

[Nasty-Z]

If you were to unplug the case connector it would default the transmission to maximum line pressure.

Actually the 4L80E with no case connection defaults to 2nd gear and reverse AND full line pressure, although the 4L80E will not make a shift without solenoid control (i.e, a case connection) .

LHM will default to full line pressure but will provide shifts.

Two different scenarios here .

TOM

[96lt4c4]

How many transmissions did it take to get the right parts figured out. Most of us don't have time and money to throw at multiple transmission builds for tranny test n tune sessions. The 80E swap becomes a high success rate fix.

It took 2 from a shop before I learned how to build my own, now I use my knowledge to build them for other people and make money on the side.

[1project2many]

It took 2 from a shop before I learned how to build my own, now I use my knowledge to build them for other people and make money on the side.

Assembling a transmission can be a challenging task so good for you for learning to build them on your own. When it comes to the 60E family I generally stop in at the transmission shop for assistance in parts selection. Sonnax alone has eight pages of parts, kits, and tools for this transmission. There have been many OE and aftermarket updates, upgrades, and changes over the years and I'm certainly not good enough to recognize every situation where a trans should have received one or more upgrades that it didn't get or to recognize an inferior copycat upgrade part when it is installed. It certainly never seems to boil down to a one size fits all recipe. Part of the problem is the truck transmission failure rate. A larger number of failures in a vehicle line leads to a greater number of overhauls / replacements with parts from a number of aftermarket sources. Between that and a growing number of transmission recipes on the 'net you just don't know what you're going to find on teardown. I understand and agree with fast355's lack of love for the '60E and in truck and van applications. I definitely appreciate the availability of the stronger '80E as a one time replacement unit.

[1BadAction]

Update. I re-evaluated my thought process on this and looked at it like this: What is the only thing that changed electrically between 1991 and 1995? The force motor. So, I changed all the tables back to stock, then modified the force motor current table. .075 amp reduction in the middle of the curve tapered off to the same on the high and the low end, and with all the other tables stock it shifts like a stock truck. This is by no means a scientific test but I feel WAAAYYY better about the way it works overall.

From this point I've bumped up some of the shift pressures in the tables to get it back in line with what I had before, and with the same "feel", everything ended up being nearly identical to the tables in my 7060. My plan for the future is to log actual shift pressures vs the commanded "pressure" and adjust the PCS tables to get the two in line, but for right now I'm comfortable with it.