Average Trans Temp for 2000 SD diesel?
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Junior User
Joined: Dec 2003
Posts: 74
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Average Trans Temp for 2000 SD diesel?
For those of you with trans temp gauges, what are the acceptable transmission temps for the auto trans that comes with the 7.3l diesel?
Unloaded, and towing decent loads as well..
Unloaded, and towing decent loads as well..
Logistics Pro
Joined: Nov 2002
Posts: 4,788
Likes: 20
From: Mansfield, TX USA
Normal operating temps are 150*-170*F. Towing any load you will probably see 180*-190*F.
You will be OK if you stay below 200*F.
Brief trips in the 200*-220*F range are accceptable but cut your fluid life in 1/2 (15,000 miles drain interval).
If you get to the other side of 220*F, you need to stop and let the tranny cool at high idle. You should also change your fluid the first chance that you get. It's cooked.
250*F+ and you start cooking tranny parts.
Slow (30-40 mph) towing up hills is very bad. No air flow through the tranny cooler and the TC unlocks, creating a lot of heat.
Also bad is pushing a trailer backward uphill, like when parking a TT. High load, NO air through the cooler and the TC unlocked.
Syn. will take the heat better than dino. Consider Mobil 1 tranny fluid.
You will be OK if you stay below 200*F.
Brief trips in the 200*-220*F range are accceptable but cut your fluid life in 1/2 (15,000 miles drain interval).
If you get to the other side of 220*F, you need to stop and let the tranny cool at high idle. You should also change your fluid the first chance that you get. It's cooked.
250*F+ and you start cooking tranny parts.
Slow (30-40 mph) towing up hills is very bad. No air flow through the tranny cooler and the TC unlocks, creating a lot of heat.
Also bad is pushing a trailer backward uphill, like when parking a TT. High load, NO air through the cooler and the TC unlocked.
Syn. will take the heat better than dino. Consider Mobil 1 tranny fluid.
Senior User
Joined: Feb 2003
Posts: 308
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From: Phoenix, AZ
Well said.
When I run on the open road empty, my temps are 150F or less. Full bed, no trailer, some hills will push it to 175 max.
I'm in the process of adding a deep sump aluminum pan, mostly for longer life towing. Hughes Performance has them for about $150, with filter, gasket, allen bolts and magnetic fill plug. The pan walls are thick enough to tap for a sender if you wish.
When I run on the open road empty, my temps are 150F or less. Full bed, no trailer, some hills will push it to 175 max.
I'm in the process of adding a deep sump aluminum pan, mostly for longer life towing. Hughes Performance has them for about $150, with filter, gasket, allen bolts and magnetic fill plug. The pan walls are thick enough to tap for a sender if you wish.
Logistics Pro
Joined: Nov 2002
Posts: 4,788
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From: Mansfield, TX USA
Originally posted by locash
Thank you for the very helpful information, I appreciate it! Also, any idea on the average lifespan of this auto tranny with occasional towing use?
Thank you for the very helpful information, I appreciate it! Also, any idea on the average lifespan of this auto tranny with occasional towing use?
Take care of it, and you should have no trouble getting to 6 digits +.
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Junior User
Joined: Dec 2003
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Well, it has 141,000 on it now, so I guess I'm probably living on borrowed time.. 
I'll be sure to change the trans fluid asap and put on a PML pan and temp gauge as well.. Guess I'll start shopping around for a good trans/trans rebuilder..
Thanks!
-joe
I'll be sure to change the trans fluid asap and put on a PML pan and temp gauge as well.. Guess I'll start shopping around for a good trans/trans rebuilder..Thanks!
-joe
