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Unread 10-09-2013, 08:55 PM   #1
big98tnzj
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Trans fluid change

my 98 v8 has 197,000 miles and the trans has started acting up lately. the fluid is burnt and reeks to hell and back. i've had it since mar of this year and dont know any of the service records. im an ase certified master tech working on certs for heavy duty diesel so i know my way around cars. i know once it gets to a certain point you shouldnt change the filter, just the fluid. i'm just lookin for some other jeep lovers advice on what to do.

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Unread 10-09-2013, 09:19 PM   #2
xcaliber81
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Why would you not change the filter? Ive never heard of that before.
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Unread 10-09-2013, 09:56 PM   #3
big98tnzj
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If the jeep trans is the same as gm trans are, then if you dont change the filter every 50,000 miles like you're supposed to then it will mess it up i've seen too many of them come into shops where i have worked because they didn't change the filter when it came due and when they finally did it ripped the torque converter out of it because it got used to the old filter where it was clogged up from debris that it started engaging early or too late
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Unread 10-09-2013, 10:07 PM   #4
xcaliber81
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Hmm well my jeep has about 487500 kms and about 15-20 000 kilometers ago I did my filter and it runs like a top no adverse effects. And I had absoutly no idea of previous history. And to be honest I wouldn't think twice about doing it again. In fact my dad is an HD mechanic of about 15-20 years and he was right there while I did my fluid change and the filter.
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Unread 10-09-2013, 10:16 PM   #5
ieattacos
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Im also a mechanic n never heard that before i thought it was jus bad to flush....i always change oil n filter when its due thats for any make or model
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Unread 10-09-2013, 10:19 PM   #6
Timo_90xj
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Quote:
Originally Posted by big98tnzj View Post
If the jeep trans is the same as gm trans are, then if you dont change the filter every 50,000 miles like you're supposed to then it will mess it up i've seen too many of them come into shops where i have worked because they didn't change the filter when it came due and when they finally did it ripped the torque converter out of it because it got used to the old filter where it was clogged up from debris that it started engaging early or too late
That's about as stupid as saying if you get past certain point on engine oil changes, you shouldn't change the oil filter or the engine will blow up. Clogged filter does restrict fluid flow, but the main reason for the tranny to let go after a fluid & filter change isn't exactly related to that. It would die fairly soon anyways even if you kept running the old filter. Tranny failure happens because of not changing fluid/ filter at certain designed intervals - in other words it's already ruined because of the clogged filter and bad fluid.

Change the fluid & filter, drive a couple dozen miles and redo fluid change. If you have a welder, I suggest welding in a fluid drain plug to the tranny oil pan. Makes your life a lot easier on next fluid changes. I don't know who was the mastermind behind the great idea of not installing one to the pans in the factory
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Unread 10-09-2013, 10:28 PM   #7
xcaliber81
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Toyotas have a drain plug in their trans I wonder why jeep did not. Toyotas also have drain plugs in their diffs man I wish lol.
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Unread 10-09-2013, 10:48 PM   #8
JColee
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Quote:
Originally Posted by big98tnzj View Post
my 98 v8 has 197,000 miles and the trans has started acting up lately. the fluid is burnt and reeks to hell and back. i've had it since mar of this year and dont know any of the service records. im an ase certified master tech working on certs for heavy duty diesel so i know my way around cars. i know once it gets to a certain point you shouldnt change the filter, just the fluid. i'm just lookin for some other jeep lovers advice on what to do.
I've actually heard this multiple times here and there. Even this weekend at the local Autozone, I mentioned it to the associate and he had heard something similar. I never really knew why it would have adverse effects.
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Unread 10-09-2013, 10:58 PM   #9
xcaliber81
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So what happens if you have to pull the valve body off do you reuse the old filter?
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Unread 10-10-2013, 12:14 AM   #10
Timo_90xj
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You may prolong the life of the tranny a little not changing the filter if it's been neglected for years, but it won't keep it from failing for too long. I prefer having clean fluid & filter inside the transmission, if it fails then it does. It must've been going bad anyway in that case..
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1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...

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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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Unread 10-10-2013, 01:42 AM   #11
jabba974
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B&M has a bolt on drain plug kit....just drill the hole and bolt it on.... I know that there are some in-line trans filter kits now-a-days...Makes life easier, and cleaner....
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Unread 10-10-2013, 03:59 AM   #12
zj97ltd
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Quote:
Originally Posted by jabba974 View Post
B&M has a bolt on drain plug kit....just drill the hole and bolt it on.... I know that there are some in-line trans filter kits now-a-days...Makes life easier, and cleaner....
One of the shows on Spike's Power Block showed them installing one of those bolt in drain plugs last week. I think that's the way to go as long as the outer part doesn't leak.
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Unread 10-10-2013, 04:05 AM   #13
AVR2
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Originally Posted by xcaliber81 View Post
Toyotas have a drain plug in their trans I wonder why jeep did not
The AW4 trans, used in the 1993 4.0L ZJ, has a drain plug as standard equipment. It's one of the ways of identifying the AW4.
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Unread 10-10-2013, 07:04 AM   #14
big98tnzj
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the whole thing started the other night when i was coming home. i can get up to 55 mph and let off the gas and it kinda jerks then starts slowing down like something is gearing me down it kicks into od and shift fine and accelerates fine but only does it when above 55 i checked the fluid it was a little low so i added about half a quart and went to work tues checked the fluid wen i got home and it was brown and burnt so i figured i would pull pan and valvebody this weekend and clean everything but before i did i was wanting some extra advice
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Unread 10-10-2013, 07:13 AM   #15
Timo_90xj
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My tranny was acting a bit like that, also felt like it was slightly slipping on 1st to 2nd shifts. I drained the fluid, replaced filter and adjusted both bands (front band is a PITA to adjust), and the tranny has been pretty much fine ever since. Shifts are a lot better now, no slipping. I do suspect the clutches and bands are a bit worn though, so I'm looking at a probable tranny rebuild within 10-20k miles.
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1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...

http://www.jeepforum.com/forum/f13/d...s-etc-1222317/


1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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