robsjeep

I got 305,000 miles on my AW4, the torque converter seems to be going out, slipping is happening.
How long does the AW4 typically last? I am thinking, should I replace only the torque converter, or the whole transmission?

What kinds of life do you all see for the AW4?

lawsoncl

Slipping as in t/c not locking up when it should?

cruiser54

I've seen them go 450,000 with heavy usage. YMMV.

robsjeep

Slip up hill such as engine revs but jepp hqrdly moves. Hot smell, but after cool down improved.

00t444e

400-500K as long as they are kept full of clean fluid.

Corky

Torque converter slippage won't produce that hot smell... That's a clutch pack on the way out burning the fluid... How the vehicle was used and maintained determines what you'll get out of it... Looks like you're getting 300,000 out of this one...lol..

TrailerTrash

this right here.
You'll get a new converter in, new fluid, filter, ect. And you'll have the same problem.
but the good news is you'll be able to swap it out or have it rebuilt fairly easily since there is nothing fancy or special about it. And you'll never have to worry about it again most likely

Jim Malcolm

I'm assuming you tried adjusting the TV Cable...

robsjeep

Ok, clutch packs. Just wondering how they work , I know about nothing of Automatics, been manual guy whole life, rebuilt VW and Porsche manuals, and helped someone on there Honda manual.

So how do the clutch packs come into play, is there clutches for each gear? I could not go up that hill in 1st or 2nd,, even 3rd so all clutches are bad? I was in low range, I have a 4.3 low range too. She just got slower and slower as engine reved more, as a burnt smell was noted, thats when I stopped, After cool down she made it up the short distance up remainder of hill to my camp site, and following day no issue on freeway that I noted.


Now would I not see clutch material in the fluid?

I pulled the drain plug and found the fluid to be new looking, nice red color, no metallic sheen, the only thing was a slight burnt smell. Would not the clutch slipping so much as I could barely move up a hill, result in a lot of crud in the fluid?

Sorry if this is a silly question.

I know in a manual, if the syncro rings start wearing bad you find bronze powder in the gear oil. but by golly the atf looked very clean, as new.

I am learning, so bear with me, thanks

cruiser54

I'm hoping he has.
With it adjusted properly, it should have almost no slack. They don't always adjust properly.
A trick is to disconnect the cable from the throttle body, pull the cable tight and clamp the wire with small vise grips. That will really increase the trans line pressure. Good for testing.

lawsoncl

X2 on checking the throttle cable, as that being loose can cause slipping.

robsjeep

cable adjustment is ok, no slack when in idle position. it is taunt at idle position.

robsjeep

The clutches, how do they work?

awg

each gear has a clutch pack inside a drum, when that gear is selected, hydraulic pressure will be directed to that clutch pack, forcing the individual clutch plates together

The plates themselves are alternating steel, and "friction" discs

The friction discs have wear material on them like an ordinary clutch, eventually they become too worn, and that is when slipping can occur

Slipping may also occur if your trans pressure is too low, so may be worth checking

The life of a trans has a lot to do with heat and duty cycle

If a trans spends a lot of time operating in a cool climate, it will last much longer than one that lives in a hot climate, typical lifespan around here does not exceed 250k miles

Google and Youtube are informative

Corky

There are master overhaul kits that contain all the components to rebuild the trans...I'd find a book specifically for the AW4 and read up on it.. The Cherokee service manual might have all the info to do it but generally the mopar tools are called out{and you wouldn't have} instead of alternative tools that aftermarket guides would have...With the mileage you've got I wouldn't just change the problem clutch pack I'd do the whole thing.. I haven't had one of these apart yet but I'm good at the old trans like mopar 727, chevy 350/400 turbo, etc...And I would be hesitant to do one..... lastly, you might be further ahead just pulling it and having someone do it for you.. Overdrive trans are no joke and a bunch of work... Here's a link to an example of a master kit for the AW4...https://transend.us/products/transmi...r-kits/97006af