45RFE transmission 545RFE reprogram?

[Spliffotticle]

This is essentially a six speed waiting to be hacked. Please tell me someone has done it. I heard some dealers can flash your computer to make the 545RFE (because the two are physically the same transmission), but I want that AND the option to up-shift into 2nd prime. Honestly, I would be lucky if the dealers around me even did the 545RFE flash. Any info would be appreciated!

[SilverXJ]

Since when was the WJ 4.0L available with anything but the 42RE?

[Spliffotticle]

Looks like you're right I must have been reading something wrong, which begs the question, is the swap realistically possible?

[5-90]

Since when was the WJ 4.0L available with anything but the 42RE?

It wasn't - the 45RFE and 5-45RFE were both used behind the V8-287.

Therefore, the bellhousing patterns will be different - you'll need an adapter plate, at the very least. Plus adaptation of the control electronics.

Neat idea - although I'm willing to bet that there may be a difference in the first planetary gearset that allows for the "split second gear" in the 5-45RFE...

[Spliffotticle]

I will add it to my list of pipe dreams. . . Adapting it is no big problem. I have been looking into the hydraulic control schematic for the (5)45rfe. I think I could make some kind of shifting override with a pwm and solenoid selector setup. The pedal position could dictate the position of the rheostat on the pwm, allowing for firmer or weaker shifts IN THEORY. I actually made something similar for my variable geometry turbo solenoid, but have not got around to testing it under real conditions. Its parameters consist simply of supply and demand.
http://www.scribd.com/doc/7095618/545rf ... ion-Manual

[5-90]

I will add it to my list of pipe dreams. . . Adapting it is no big problem. I have been looking into the hydraulic control schematic for the (5)45rfe. I think I could make some kind of shifting override with a pwm and solenoid selector setup. The pedal position could dictate the position of the rheostat on the pwm, allowing for firmer or weaker shifts IN THEORY. I actually made something similar for my variable geometry turbo solenoid, but have not got around to testing it under real conditions. Its parameters consist simply of supply and demand.
http://www.scribd.com/doc/7095618/545rf ... ion-Manual

Really? Do you have dimensioned drawings of various bellhousing patterns already? I've been trying to collect them, so I'd appreciate copies of anything you might have found already...

[Spliffotticle]

I apologize, by no big problem I mean it's as easy as collecting the info that you are looking for I haven't got it yet. I have done this before with a fuel injected ej22 subaru engine to an ea style 4 and 5 speed 2wd/4wd /low range transaxle. I didn't even need a plate. Just drilled 2 extra holes in the transaxle where needed and shimmed all the way around. I redrilled the smaller ea81 flywheel so the starter fit but also set one up for the ej22 clutch and flywheel... it was a turd. smaller flywheel = faster wind
Last time I ran it I popped something inside the transmission when I was bound up so now it's a paperweight. It had nothing to do with the mating. Here's an artist's connception before someone closes this tangent thread

P.S. now it has a unistrut brush guard with a winch instead of that ridiculous set of horn-rimmed nerds

[5-90]

Ah, bugger. I was hoping...

I've got to write more manufacturers anyhow - it's part of the research for Swappology (it's a misappropriation that put it up here - you can tell, because he spelled it wrong. "Swappology" is my own work, I came up with it as a working title for my next book, and even coined a definition for it. About a year and a half before this board went up!

(I'm not even annoyed by it - I posted about it in good humour some time ago...)