I thought the last build was holding up Ronnie? What's happening with it?
Well on a w.o.t. kickdown from a 30 mph cruise (with the T/H mode shut off), first AND second come on together and that tries to tear up the 48RE. The truck goes straight UP on the suspension and the engine screams. And that's what has been doing the trannies in. 3 Valve bodies and 2 complete overhauls later and its the same. Its good for about 4 or maybe 5 of those and then the tranny is completely done.
But it doesn't
always do that. Sometimes it works "almost" properly, thats the best way I can describe it.
It has changed since I got it back this last time when it seemed like it was solid. The odd part is
IT CHANGES when it feels like it.
Maybe it requires an Excorcism.
That's problem #1
Problem 1A is the line pressure. It seems to be backwards according to the scanner when out for a test drive. Lots of pressure at low speeds and really low pressure where it needs to be high. It has an internal hemorrage maybe??
It seems to work fine in T/H mode though; BUT it is currently ignoring the tune for a shift-point and bouncing off of the hard limiter at 6800 so I always have to lift.
It will also kick down INTO FIRST GEAR at 70+ m.p.h. (good thing the S/D limiter works).
It also has a ridiculous 3-4 and a 4-3 shift that will loosen fillings and will eventually break something. It seems as if the O/D clutches are stacking. That's problem #2.
Could I drive it like it is? Yes
Am I going to? No
It is one bitchy 48RE that won't do what it is supposed to.
For now, I'll get it to the dyno, get some tuning passes on it and then rip it out and apart through the Winter.
The guy (Hydraulics Engineer) I went for a drive with today seems to know 75% of what's going on in there but it also has got him going "Hmmmmm"...
He build trannies for the really high hp stuff and likes a challenge.
He now has one.
Good thing it's a hobby!
2016 here we come..