Transmission temperature rising

[Jerry Emert]

Just an afterthought.  Our coach had an auxiliary transmission cooler installed by a prior owner because of high heat numbers.  Since we have owned the coach (August 2012), I have noted our transmission temperature runs about 40 to 45 degrees over outside temperatures.  Yes, in 100 degree outside temperatures, we might see 145 on the Aladdin's transmission temperature, but that high a temperature is very rare in our travels.  I do not recall ever seeing a transmission temperature of over 145 degrees in almost 7 years.  I am more concerned our transmission temperatures are not high enough.

David, just a thought...both Allison Reps. were engineers for the company.  They both mentioned that they see far more problems with transmissions that never reach operating temp.  I can't remember if that temp is 140 or 160.  It seems like you have doing well for a long time but I felt that I should pass on what they told me. 
Jerry

[Fred Cook]

This is what I use. It’s good stuff and my temp never goes beyond 195 and hovers around 188.

Full-Synthetic; Heavy Duty Automatic Transmission; BP Autran Syn-295 is a full-synthetic, heavy duty automatic transmission fluid approved for use under Allison TES-295.  It is formulated to maintain its stability, even under the most severe operating conditions. Transmission service intervals can be extended from 12,000 miles to 150,000 miles in some severe duty operations, and up to 300,000 miles in general duty operations.