Converter question and converter tuning for 4l60e gen 4 5.3

[chevyman97]

Hello

I recently had my transmission rebuilt into a 4l65e for my 08 silverado LC9 5.3, 33in tires with 4.56 gears in the front and read differentials couple months back. (FYI drove the 4.56 gears for a while before the rebuilt trans, love the gears!). I ordered a 2600 Circle D stall converter with plans on camming my engine in the future. I put the converter in with the rebuilt trans and the shift from 3rd to 4th gear was hardly noticeable with no apparent lock up from the converter, roughly 3000+ rpm at only 60 mph. Sent the converter back to circle d and they said it had a cracked stator race. No issues with install and trans was spotless, absolutely nothing wrong with the trans just a defective converter.

My tranny guy thinks that 2600 stall with the 4.56 gears is too much especially for highway driving. He claims the engine is just going to be in a higher RPM range all the time and will wear out the engine soon.

Circle d says that when the converter locks up the 1:1 ratio between engine and trans will provide the same rpm as a stock stall converter at highway rpms but this is definitely not what I saw with the cracked stator race converter the first time. My trans guy says even when the accelerator pedal gets pushed a little bit at highway speeds the converter will unlock and rpms will go up and the drivability just wont be great which makes sense.

I plan to put in the summit stage 2 high lift truck cam shortly.

Knowing I have 4.56 gears and definitely drive highway speeds at 80-90 mph (where with a stock stall was definitely not too high of rpm even with the 4.56 gears and 33 in tires) and will be installing a mild to fairly aggressive cam in soon.

What converter do I put in? Circle d 2600 stall or stock stall?

Both converters are new btw.

I loved the torque and acceleration when the 2600 rpm stall was in but the 3000+ rpm at 60 mph was just ridiculous and I hope that was only due to a defective converter. I feel the 2600 rpm would be good for that cam but want to make sure highway rpm were the same as the stock converter.

Anything I can do with hptuners to ensure the converter stays locked at those speed and/or when towing? Also is there any other tuning I should do with a higher stall converter? Only thing I have done so far is use the gear and tire wizard to adjust for the gears and new tire size.

Thanks for the input

[Frost]

You should have taken it to see a tuner right after the stall was put in.

You can tune it for the converter... but that's more than a short reply.

[chevyman97]

You should have taken it to see a tuner right after the stall was put in.

You can tune it for the converter... but that's more than a short reply.

Most of the transmission shops I called said it would drive fine without the tune but I did purchase HP tuners to start out tuning and hopefully learn rather than take to another tuner. Do you have any tips as to places to start with a high stall converter tune?

[2xLS1]

The 2600 stall converters I've seen and driven are barely noticeable when unlocked. I don't really consider converters 'high' stall until a minimum 3200 stall speed. But I've been driving vehicles with 3500 converters in them for 20 years now and getting ready to switch one of them to a 4000. Albeit not in trucks, but I tune for a shop that has been putting Brian Tooley Racing 2600s in trucks lately and they are barely noticeable and not noticeable at all when locked. Not sure how Circle D 2600s are but if it is still the stock diameter size converter which I bet it is I think it will be fine. IMO converters need to be in the 9.5" size range to feel loose. And with tuning you can keep a converter locked with light throttle increases.