07NBSChevy

iTrader: (1)

OK guys, So I would like to go with a Circle-D High Performance 300mm 2400-2600 rpm stall Converter to match my new cam for my 4L70E. My biggest concern would be excessive heat since I tow on a regular basis. I have been told to stick with the stock size converter, 300mm, for towing heavy. I guess it uses a larger lockup clutch or something.

I currently use a 40k Cooler with my Sonnax 4L70E which does an awesome job at keeping my trans under 190 degrees. While towing, temps stay at/under 187 and normally (Not Towing) see temps around 135-150. I tow 2-3 time a month through some steep grades. My truck does just fine right now towing and do not have any issues. My Travel Trailer weight comes in at 7200lbs and I am sitting about 500lbs below my Max GCVW Rating of 13,500 with fuel, cargo, and passengers. I know once the converter is locked I will be fine, but during the steep inclines I do get down to around 30mph. I currently have 4.56 gears with 34"x12" All Terrains. I do also go to the drag strip to mess around and race some friends.

Should I stick with the stock converter, which is around 1600-1800 stall, or would I be safe with the Circle-D? I talked to Circle-D about 8 months ago about this (at that time I did not have a cam swap done), I can not remember who I talked to tho, and he did say that I should be fine but may see some higher temps. I would really like to keep temps under 205 just to be on the safe side. So if anyone has any input on this, let me know.

mrvedit

I would suggest a triple disk converter and a tune to allow lockup in 3rd gear and at any throttle position. Most tunes do not lockup in 3rd and unlock the converter above 50% TPS to prevent damage to the lockup clutch. However a triple disk converter can handle 100% TPS. As you may know heavy-duty pickup trucks have triple disk converters from the factory for exactly these reasons.

Circle-D_Brian

I know you have already gotten our .02, but I think either our 265mm multi disk or a 300mm HP series converter would be just fine. You may consider adding a deeper pan to increase fluid capacity in the system if temps become an issue. Are you having any pushing at the brakes with the camshaft and the stock converter?

-Brian

07NBSChevy

iTrader: (1)

I do have a Mag-Hytec trans pan which holds, I think, 4 more quarts of oil. Cam has no effect in regards to pushing at the brakes. The cam is a small 212/218 .553/.553 113+2 LSA, if you didn't notice it in my sig.

I will look into the triple disk, by the sound of it it may be the way to go. What would be a good stall speed that would be good for towing with my configuration?

01ssreda4

iTrader: (96)

You'll be fine with the single disk. Two things, watch trans temps (due to the higher slip) and dont overload the lockup clutch (which means tow in tow/haul to delay engagement) and you're golden. Don't overthink this. I have the 2a 3/3200 in mine and it tows like a champ.