Tranny temp while towing too high?

[marc1]

Originally Posted By: SteveSRT8
Originally Posted By: AZjeff
No, it's got a 4L60E transmission. Yes I use the tow button.

Trav, you say you can see the effects of using LGR in your vehicles. What difference do you observe?


Ouch. I wonder why my 2005 Silverado has the 4L65E? Do you know the differences?

Anyways, Trav has used his scan tool to show significant temp drops when LGR is added. We use it now based on his observations and agree.


Is your 2005 a 3/4 ton (or more)? I believe HD GM's got the 65. On your RPO sheet it will show M32 (the 60 is an M30). I have only ever owned 1/2 ton light trucks so I have only had the 60. As far as I can tell the differences are:

1) five-pinion rear planetary (the 60 only has 4 I believe)
2) hardened input shaft and sun shell

A lot of 60 guys upgrade to the above 65 parts. I don't tow much and never been over 7000# when I have so I have been fine with the regular 60.

 

[4Kings]

2500's get the 4L80 or 4L85

 

[AZjeff]

Trip report with the transmission cooler and LGR: At the same ambient temp but a loaded little lighter I saw 195f compared to 210f at the same exit on the highway. Further up the hill it touched 200f briefly just as we topped out. On the final 7 mile 2nd gear/ 45mph pull it worked up to 195 by the end. On fairly flat ground it runs at 165 or a touch under. This seems acceptable pulling 5000#. I'll add another bottle of LGR before the next trip.

Thanks for the replies and the suggestions for LubeGuard. M30 trans on the build sheet.

Now that I have a way into the return line from the cooler I can do my own transmission flush. Any suggestions on a good safe interval? Factory recommends 50K. I had the dealer do a filter/flush with synthetic at 50K, 68K on the truck now. Pretty sure they used BG Products.

 

[SteveSRT8]

we run most of our trucks till around 30k miles, then flush.

Every other flush I drop the pan to change the filter.