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Old 11-17-2021, 06:13 PM   #1
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W22 trans question

I've just purchased a 2004 Tiffen Allegro on a W22 chassis. My understanding is that it's an Allison 1000MH trans? And also that there is no park pawl in these transmissions? It has a manual foot operated park brake which I do set but I'm surprised if it does not have a pawl considering this is a variation of the trans used on GM trucks with the Dura Max. Any info/tips/tricks on care and feeding of this trans are greatly appreciated.
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Old 11-17-2021, 06:31 PM   #2
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Yes you have an Allison 1000 series tranny and it DOES have a parking pawl, therefore you do not have the infamous J71 AAPB. The foot operated PB is there to augment the parking pawl. Use it.
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Old 11-17-2021, 06:35 PM   #3
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That tranny has a spin- on external filter, p/n 29539579, which isnít expensive and can be changed easily. IF you donít know what fluid is in use now, a lab test can confirm IF it needs to be replaced. The good stuff, TES-295 approval # from several brands, isnít cheap. Thats why testing is advised.
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Old 11-18-2021, 06:29 AM   #4
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Confirming that the Allison 1000 in my 2004 W22 does have a park pawl. I hope yours isn't broken!
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Old 11-18-2021, 07:17 AM   #5
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Does your mh have a shift lever with a park setting?
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Old 11-18-2021, 08:19 AM   #6
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Yes his does have a ďPĒ position on the shifter, but so do the P32 chassis that donít have a pawl in their 4L80-E Tranny made by GM.
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Old 11-18-2021, 08:22 AM   #7
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Quote:
Originally Posted by edgray View Post
The good stuff, TES-295 approval # from several brands, isnít cheap. Thats why testing is advised.

Actually, the TES 295 has been replaced/superseded by:


Allison TES 668


It is fully backwards compatible and is recommended by Allison.
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Old 11-18-2021, 09:09 AM   #8
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Thanks all for the help. I work in a parts store so the filter and fluid are readily available to me. The dealer I bought it through took it to an IHC dealer for complete service before I pick it up but he's waiting on exhaust manifolds so my driving experience with it is limited. It does have a park position and the park brake does work so I guess I'm just a bit paranoid after reading some of the stuff I've found on the net.
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Old 11-18-2021, 11:15 AM   #9
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Don't worry, 2004 is a good year for the W22. The infamous auto-park brake problem doesn't apply to us (P32 only), fuel pump problems are mostly 2003 and earlier and the sloppy steering box didn't start until 2005 or 06. Just make sure the brake recall on the Bosch calipers has been done. I bought mine used through a dealer and they took care of that pre-delivery. I didn't even know there was a recall at the time.
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Old 11-18-2021, 11:22 AM   #10
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Quote:
Originally Posted by Britbiker View Post
Thanks all for the help. I work in a parts store so the filter and fluid are readily available to me. The dealer I bought it through took it to an IHC dealer for complete service before I pick it up but he's waiting on exhaust manifolds so my driving experience with it is limited. It does have a park position and the park brake does work so I guess I'm just a bit paranoid after reading some of the stuff I've found on the net.
That is understandable, but I believe you won't find more factual info about a WCC chassis anywhere than you will right here. Please feel free to post any questions you may have once you get to drive it some. LOTS of experienced owners here that are glad to help.
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Old 11-18-2021, 11:24 AM   #11
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Quote:
Originally Posted by wolfe10 View Post
Actually, the TES 295 has been replaced/superseded by:


Allison TES 668


It is fully backwards compatible and is recommended by Allison.
Yeah, I know. Old habits are hard to break. I'm guessing the remaining stocks of TES-295 fluid will be cheaper now that there is a "new" standard for Allison to promote.
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Old 11-18-2021, 11:31 AM   #12
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Just to jump in here, if you are going to do any pulling with your new rig, I would strongly suggest that you install a PPE deep Tx pan (raw aluminum version) and the over sized Tx filter, plus a Tx temperature gauge.
I did, and even pulling an 8K car hauler over the mountain passes, I don't exceed 195F on the gauge. She usually runs about 185F, which is well within the temp limits of the Allison 1000.
I did put the 2 pancake fans in front of the Tx cooler on a toggle switch, and the are turned on at the base of the passes we cross.

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