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Old 10-20-2010, 10:08 AM   #1
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shop says they cannot perform transmission flush

I just purchased a 98 wrangler and took it to the shop to have an alignment, wheel balancing and transmission flush done and they just called and said because this is a standard that it is a sealed transmission and so they cannot perform a flush, they can only add fluid.

What do they mean by sealed transmission and not being able to perform a flush?

I did some searching but did not find anyone talking about a sealed transmission.

Thanks again,

Charley

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Old 10-20-2010, 10:11 AM   #2
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What transmission do you have? An automatic or a manual? You can only flush an automatic but you can certainly drain and refill either type. Neither however are "sealed" (NO Jeep transmissions are sealed) so that transmission shop you went to needs to hang their head in shame for giving you bad information.

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Old 10-20-2010, 10:17 AM   #3
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If it is a manual, you let the fluid out the drain plug and put that back in, then fill it through the fill plug. If it is an automatic it is, in a sense, "sealed," meaning there is no drain plug on the pan for the fluid. That's because you drop the pan and drain the fluid that way. Then you seal up the pan again.

It is getting harder to find mechanics who want to drop the pan and change the filters on automatics. They want to use their flushing/changing machine because it doesn't take very long and they can charge more for it. If you don't drop the pan, the old filter stays in there. Their argument is that the flushing is better since changes all the fluid in the transmission, not just the fluid that drains out when you drop the pan.
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Old 10-20-2010, 10:18 AM   #4
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Trans flush

I have a 97 and did all my own driveline fluids , simple and a nice piece oi mind . Trans and transfercase very easy to do just have to buy the right tools.
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Old 10-20-2010, 10:18 AM   #5
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Your standard can't be flushed in the sense that an automatic can. However the fluid can be changed rather simply. pull two plugs, put the bottom one back in, fill until fluid come out of second plug hole, and put second higher plug back in.
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Old 10-20-2010, 10:22 AM   #6
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When you drain the fluid out of a manual gearbox, it pretty much all comes out. There are not quarts of the old fluid retained as with an automatic. Changing the fluid is a pretty simple DIY job. The transfer case is simple too, but messier if you leave the shield in place under it. No big deal with gloves on.
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Old 10-20-2010, 10:28 AM   #7
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Incompetence lives on! Do they even speak English?
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Old 10-20-2010, 10:31 AM   #8
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List the name and location of the shop so others know who to avoid.
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Old 10-20-2010, 10:31 AM   #9
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Originally Posted by 4everrunning View Post
I just purchased a 98 Wrangler and took it to the shop to have an alignment, wheel balancing and transmission flush done and they just called and said because this is a standard that it is a sealed transmission and so they cannot perform a flush, they can only add fluid.

What do they mean by sealed transmission and not being able to perform a flush?

I did some searching but did not find anyone talking about a sealed transmission.

Thanks again,

Charley
I'm assuming you have an automatic transmission, hence the mention of flushing.

Be thankful that they won't do a flush, especially a power flush.
- the fluid used for the flushing may not be suitable for the transmission
- considerable dirt in the transmission can be "disturbed" and end up on the filter
- the filter won't likely be changed in the process.

Transmissions can be flushed but in a different manner than power flushing. The filter should be changed afterward.

As to sealed transmissions, they are becoming common on Chrysler products with their six speed automatics. Your 1998 Wrangler won't have a sealed transmission unless someone did major modifications. I think the sealed transmissions are good in the sense that DIYers, who don't read their Owner Manual, can't get at the transmissions to add the wrong fluid or overfill them.

I'm thinking the service rep has your vehicle mixed up with someone elses. Perhaps they are replacing the rear end on yours, by mistake.
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Old 10-20-2010, 10:37 AM   #10
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If could be a matter of terminology... technically when you drop a pan and change a filter, you're leaving a portion of the old fluid, so the shop might simply be unwilling to call it a "flush" without being able to use the machine...

Did you ask them to replace the filter and fluid? changing the verbage might make it a different story... Maybe they only speak "barney terms" english.
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Old 10-20-2010, 10:59 AM   #11
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Originally Posted by TJeepman View Post
I think the sealed transmissions are good in the sense that DIYers, who don't read their Owner Manual, can't get at the transmissions to add the wrong fluid or overfill them.
Jeeps don't actually have those do they?
I thought they were mostly for chevette clones and lexuses...
I'm not too keen on a major assembly with "no maintenance inteval required"

You can still add the wrong fluid or overfill em anyway... build it idiot proof and someone will build a better idiot.
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Old 10-20-2010, 11:04 AM   #12
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Jeeps don't actually have those do they?
As mentioned above, no Jeep transmissions are sealed.
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Old 10-20-2010, 12:30 PM   #13
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Thanks for the information. I mainly dropped the jeep off for an alignment and tire balance but decided on the flush as well. It is a manual btw. I will just replace the fluid myself this weekend.

Thanks again for all the responses.

Charley
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Old 10-20-2010, 12:36 PM   #14
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Be wary of what gear lube you use for your transmission because it is fussy about what lubricant it runs on. You cannot use just any 75W-90 GL-5 gear lube, that is for sure. Most GL-5 75W-90 gear lubes will attack the gear synchronizers. Acceptable 75W-90 GL-5 gear lubes include those from Royal Purple or Amsoil. Most other GL-5 75W-90 gear lubes are not good to use.

Or better, you can use Redline MT-90 which is synthetic and is the more preferable 75W-90 GL-4 gear lube. Or easiest of all to obtain is any good quality synthetic 10W-30 engine oil which was recently added by the transmission's manufacturer as a lube that is acceptable. A 10W-30 engine oil is roughtly the same viscosity as a 75W-90 gear lube as the viscosities are measured differently on two different viscosity scales.
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Old 10-20-2010, 12:51 PM   #15
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I was planning on using Redline MT-90 but is it preferable to use 10W-30 synthetic engine oil?
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Old 10-20-2010, 01:35 PM   #16
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I was planning on using Redline MT-90 but is it preferable to use 10W-30 synthetic engine oil?
I use the Mopar stuff, no second guessing as to how it will work. They look your vehicle VIN# up as to what it takes before they give you the product (don't know why they can't use year, model). Expensive, but what synthetic isn't? Then again, I get my stuff at "trade price" from the Dealer, so I save a bit. One should always go that route.

Some tips here: Jeep NV3550 Transmission & NP231 Transfer Case Service re changing fluids.

On a jug of Mopar transmission fluid that I have, it says:
Quote:
Manual Transmission Lubricant NSG 370 / NV 3500
1 US Quart
MS 9224
"Maintains shift quality and cold temperature properties"
That's part # 4874464 here.

From MOPAR 4874464 - MOPAR® Manual Transmission Lubricant - Quadratec
Quote:
MOPAR® Manual Transmission Lubricant
Quadratec Part No: 52250.91
Manufacturer Part No: 4874464
$19.99
Genuine MOPAR® transmission fluid. This is a synthetic fluid used in the 5-Speed NV3500 & 6-Speed NSG-370 Transmissions. 2 Quarts required per transmission.
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Old 10-20-2010, 01:41 PM   #17
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I was planning on using Redline MT-90 but is it preferable to use 10W-30 synthetic engine oil?
No, the Redline MT-90 is actually ideal for both the AX-15 and AX-5 transmissions and meets the manufacturer's (Aisin's) lubricant specifications perfectly.
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Old 10-20-2010, 01:41 PM   #18
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Tjjeepman isn't a 98 the AX-15 5 spd? The specs you gave are for later models..
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Old 10-20-2010, 01:43 PM   #19
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I use the Mopar stuff, no second guessing as to how it will work. They look your vehicle VIN# up as to what it takes before they give you the product (don't know why they can't use year, model#). Expensive, but what synthetic isn't? Then again, I get my stuff at "trade price" from the Dealer, so I save a bit. One should always go that route.

Some tips here: Jeep NV3550 Transmission & NP231 Transfer Case Service re changing fluids.

On a jug of transmission fluid that I have, it says:

That's part # 4874464 here.

From MOPAR 4874464 - MOPAR® Manual Transmission Lubricant - Quadratec
You have failed to note the fact the OP's '98 TJ has the AX-15 transmission and not the NV3550 used in 2000 and newer TJs. Those specs you are listing are for the newer NV3550 which is a completely different transmission that has a different lubricant specification.
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Old 10-20-2010, 01:51 PM   #20
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You have failed to note the fact the OP's '98 TJ has the AX-15 transmission and not the NV3550 used in 2000 and newer TJs. Those specs you are listing are for the newer NV3550 which is a completely different transmission that has a different lubricant specification.
Guess that's why they go for the VIN#. Thanks.

So, for the 1998 AX-15, use 75W90 GL-4/5 synthetic gear lube as already mentioned. May as make the shifts as smooth as possible, especially in cold weather.
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Old 10-20-2010, 01:58 PM   #21
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How can I tell which transmission that I have? It is a 98 Wrangler Sahara with a 5-speed?

Thanks,

Charley
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Old 10-20-2010, 02:05 PM   #22
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How can I tell which transmission that I have? It is a 98 Wrangler Sahara with a 5-speed?

Thanks,

Charley
It was mentioned several times above that your transmission is the AX-15.
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Old 10-20-2010, 02:09 PM   #23
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Thanks. There was a lot of talk about the different transmissions and I just wanted to make sure. I believe I will go with the Redline MT-90. I have ran that in a previous vehicle and it drastically changed the smoothness of that vehicle.

Thanks again for all the quick responses.

Charley
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Old 10-20-2010, 02:24 PM   #24
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I believe I will go with the Redline MT-90.
You can't beat MT-90 for the AX-15 transmission Charley, it's very good stuff.
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Old 10-20-2010, 03:13 PM   #25
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You can't beat MT-90 for the AX-15 transmission Charley, it's very good stuff.
Thought this Post by you was very informative as to why the concerns when using 75W-90. Thanks.
http://www.wranglerforum.com/f5/tran...tml#post810122
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Old 10-22-2010, 01:46 PM   #26
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So, for the 1998 AX-15, use 75W90 GL-4/5 synthetic gear lube as already mentioned. May as make the shifts as smooth as possible, especially in cold weather.
NO do not use GL-5. With few exceptions GL-5 will react with the material the syncros are made from. GL-3 or GL-4 are safe to use in either AX5 or AX15.
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Old 11-02-2011, 10:26 AM   #27
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hate to bring up an old thread but, i have an 04 with the nv3550 manual transmission i looked online and found the royal purple for and automatic. is it different for the manual? if so what should i get? thanks for any help
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Old 11-02-2011, 10:36 AM   #28
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Automatics and manual transmissions do not use the same lubricants. For your NV3550, good choices include Royal Purple Synchromax, Amsoil Synchromesh, or Redline MTL.
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Old 11-02-2011, 10:38 AM   #29
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is there something i can use to "flush" it that will clean out any build up if any?
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Old 11-02-2011, 03:00 PM   #30
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is there something i can use to "flush" it that will clean out any build up if any?
If you've got alot of time on your hands and an adventurous spirit, Kerosene... Otherwise just a drain and fill should be fine.

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