Results 1 to 6 of 6
Thread: Transmisson Temp
02-14-2009, 11:22 AM #1
- Join Date
- Feb 2009
I have a 2008 Silverado 4.3 V6 What Is the max Safe transmisson temp? I have seen 228 Deg in Traffic. Would like to know what others have seen Over 200 Seems High to me.
02-14-2009, 11:39 AM #2
- Join Date
- Mar 2007
- Grand Prairie, Texas
- Blog Entries
228 is still in the safe range.
If I remember correctly most trans fluid doesnt start breakdown until around 270, but that depends on brand, age, additives added, etc.
It wouldnt hurt to put an inline aux trans cooler on, they can be purchased for under a $100 at most auto parts stores and can reduce temps as much as 20deg in traffic(even larger reductions can be seen on open highway driving) depending on where its placed.
And certain additives are pretty helpful at reducing friction.
It's almost impossible to cool off an automatic transmission to much.
02-14-2009, 08:19 PM #3
- Join Date
- Jan 2008
- Sarasota, FL
228 is still WAY too hot in terms of longevity. A well cooled transmission should be no hotter than an engine, and sometimes as low as 160. 210 is MAX in my opinion. Keeping the trans in the range of the engine temp, and even just slightly cooler will prolong the useful life of the fluid at least twice over, especially with Dexron III
Highly recommend looking into an auxiliary cooler. B&M is a good company.
'93 Pontiac Bonneville SE | Series I Buick 3800 L27 | Dark Yellow Green | 3.06:1 | | 225/60 TripleTreds 2/9/08 | 106k | The Mean Green Machine
'04 Chevrolet Avalanche 1500 Z71 4x4 | Gen III Vortec 5300 LM7 | Summit White | 3.73:1 | XM, Bose 6 Disc Changer | 12-way Heated Leather | 58k
02-14-2009, 10:45 PM #4
Mobil 1 makes a synthetic automatic tranny fluid which will run cooler and not break down as easly. It can be purchase at walmart or most parts stores. Also Earls make great coolers in just about any size you need.
02-15-2009, 10:36 AM #5
Yeah that seems really high to me. My allison in my 3500 silverado never goes above 200 when I'm pulling my 28' enclosed trailer loaded up w/ my car and equipment. I'd see about getting a tranny cooler is your truck doesn't already have one.2004 silverado 3500 SRW 4x4 8.1l w/ allison 5spd
HPTuners flash tuned
Trueflow Cold air intake w/ K&N panel filter
Gibson 4" Catback side swept exhaust
MB motoring 16" mirror polished wheels
Hankook dynapro ATm 285/75/16
Mrtaillight.com High/Low beam Fog conversion kit
Hunter truck accessories bull bar
Upgraded mirrors to power extended flex mirrors
02-15-2009, 10:51 AM #6
When I pull my 33' trailer in 100 degree heat the tranny stays around 200 degrees. I see that the tranny temp typically stays about 80 to 100 degrees hotter than the ambient temperature.Trevor - Huntington Beach, CA
2007 GMC 2500 4X4
By Nothing_Lost in forum GM PowertrainReplies: 0Last Post: 01-17-2010, 07:50 PM
By Earl27 in forum Chevy Silverado Forum (GMC Sierra)Replies: 3Last Post: 07-20-2009, 09:55 AM
By TJ smith in forum Chevy Silverado Forum (GMC Sierra)Replies: 8Last Post: 05-13-2009, 04:02 PM
By firstname.lastname@example.org in forum GM PowertrainReplies: 2Last Post: 04-05-2009, 11:47 PM
By joemud in forum GM PowertrainReplies: 2Last Post: 02-06-2009, 11:24 AM