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2500HD/3500 HD Trucks & Drivetrain Discussion Forum for the 2001 & newer 2500HD/3500 Trucks, Transmissions & Drivetrain

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  #1  
Old 03-11-2002, 12:08 PM
jfile jfile is offline
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Question

What is the best type of transmission fluid to use and how much does the Allison take.
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  #2  
Old 03-11-2002, 03:05 PM
IndigoDually IndigoDually is offline
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Cool

Go to http://www.allisontransmission.com and look up info on the series 1000 transmissions. You can find a lot of info there. There are only 3 types of fluid that is usable in these transmissions Dextron III, TranSynd from Allison by Castrol and a mix of the two when you are switching from one to the other. Find a local Allison shop to buy fluid and filters from, the parts will be significantly cheaper than from a GM Dealer. You can also look into a deep pan and pick-up tube in you want to increase the fluid capacity.

[ 03-11-2002: Message edited by: IndigoDually ]</p>
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  #3  
Old 03-11-2002, 11:56 PM
BobW BobW is offline
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Question

Looking through the Allison Operator's Manual they describe two pans - standard and shallow. They show shallow initial fill 14.8 qt and refill 10.6 qt. The standard pan at refill 12.7 qt and refill at 7.4 qt.

Is there a third "deep" pan available or is the stock pan the "shallow". What is the capacity of the deep pan?
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  #4  
Old 04-10-2002, 12:15 PM
gdblake gdblake is offline
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Can Mobil-1 fluid be used?--I'ts Dextron and locally availible.
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  #5  
Old 04-10-2002, 02:18 PM
TXMAX TXMAX is offline
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gdblake,

As long as the Mobile 1 is DEXRON III Certified it should be fine. When the time comes I'm going to either use Amsoil or Transynd for mine and I'm going to do the pump out that is talked about in an earlier post. At this point all I have done is change the filter.
Are you out next to Lake Bridgeport?

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  #6  
Old 04-10-2002, 03:37 PM
TXDMAX TXDMAX is offline
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Just had an interesting conversation w/ a Mack truck salesperson. We were discussing extended warranties on our Dmaxes. He was telling me that warranties alone on their transmissions are 2K to 4K, and that the trannies run 15K to 20K to replace. He told me that Allison just came out w/ a bulletin stating that they would not honor any warranty repair over 50K miles if the Allison did not have Transynd. I don't know the full truth to it someone here probably knows better than me but that is pretty convincing to switch over even though my truck won't be used as hard as the Mack trucks he sells. Maybe Big Al can shed some light on this.
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  #7  
Old 04-10-2002, 07:19 PM
mdrag
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gdblake,

Mobil 1 synthetic ATF is on the Allison Approved oils list (available as a pdf document download):

http://www.allisontransmission.com/p...cationType=All

However, only Transynd is approved for extended drain intervals, so if you use Mobil 1 ATF, you will have to follow the normal maintanence schedule.

The OEM pan on our trucks is the shallow pan, and a comparison of the deep and shallow pans:

STOCK SHALLOW PAN CAPACITY 7.4 QTS (ALL YOU CAN DRAIN)
LARGE PAN CAPACITY 7.4 QTS + 3.2 QTS = 10.6 QTS

TOTAL CAPACITY (DRY SYSTEM) W/SHALLOW STOCK PAN 12.7 QTS
TOTAL CAPACITY (DRY SYSTEM) W/DEEP PAN 15.9 QTS

TORQUE PAN BOLTS = 20 ft lbs
TORQUE DRAIN PLUG = 25 ft lbs
NOTE*
1. Old suction screen seal may stick in.
2. Allison filter has removable magnet.

Part #s for the deep pan and internal suction filter for the deep pan:

DEEP PAN SUCTION FILTER
new part # 29537966
old part # 29536891

DEEP PAN
part# 29536522

PAN GASKET
part# 29536526

I listed the pan gasket - it is reusable and should not need replaced when changing pans.

ON EDIT: The forum software edited the link, the last part of the link should read:

GN3465EN. j s p

Leave out the spaces bwtween the 'dot' and the last 3 letters. Or go to

http://www.allisontransmission.com

and chose PUBLICATIONS from the menu below the Allison emblem, then search BY PUBLICATION NUMBER - using GN3465EN.

Last edited by More Power; 08-11-2007 at 12:51 AM. Reason: update link
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  #8  
Old 04-11-2002, 07:21 AM
Buckman Buckman is offline
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TXDMAX - The requirement to use TranSynd in order to keep the Allison transmission warranty intact is applicable to medium and heavy duty trucks sold thru many OEM's such as Mack, Freightliner, etc. where the purchaser has the option to buy an extended transmission coverage and has done so. The price of such coverage depends upon the truck vocation. A refuse truck application would cost more than say a delivery truck based on the type of duty cycle the vehicle is likely to see. There is no requirement on the pickup trucks to utilize Transynd in order to keep the warranty in effect on the transmission. It is a personal choice to use DexronIII or TranSynd. The only extended warranty coverage for the pickups that might be available would be thru the Chevrolet/GMC dealer, not Allison Transmission. Sorry for the rambling and hope this answers your question. [img]smile.gif[/img] [img]smile.gif[/img]
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  #9  
Old 04-17-2002, 08:17 AM
gdblake gdblake is offline
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TXMAX and MDRAG, Thanks for the responses. I'll use the Castrol TranSynd on first change. Yes, TXMAX--right here at Bridgeport lake. George

[ 04-17-2002: Message edited by: gdblake ]</p>
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  #10  
Old 04-17-2002, 07:27 PM
DrL30047 DrL30047 is offline
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What is in the truck from the factory, Dextron III or TranSynd?
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