Torque Converter Help Please

[wildweaselmi]

I have a 91 with a GM Crate HT383 motor and a 700R4 (or the 4l60 without the e).

The trans guy put a 3500 stall converter and its sluggish. My thought is it should be a 2800 stall but looking for advice to get the most power (Highway and Offroad)

Gearing: 4:56
Tires: 37.5"

Attached power band for the HT383 motor thinking it might help a professional help me dial this in. I would like to do this just one more time if it all possible.

 

[bigblock72]

I have a 91 with a GM Crate HT383 motor and a 700R4 (or the 4l60 without the e).

The trans guy put a 3500 stall converter and its sluggish. My thought is it should be a 2800 stall but looking for advice to get the most power (Highway and Offroad)

Gearing: 4:56
Tires: 37.5"

Attached power band for the HT383 motor thinking it might help a professional help me dial this in. I would like to do this just one more time if it all possible.
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With 300 ft. lbs right off of idle there is no reason to run a loose converter. Just save yourself a lot of grief and get a good quality furnace brazed stock type converter and be done with it. Make sure the lock-up is functional so you don't overheat the crap out of the trans when driving down the highway.

With 37" tires you could gain a lot by going to 5.13 gears and the motor will pull overdrive a lot better especially in hilly terrain.

 

[Greg Ducato]

You shouldn't need anything more than 2500 stall with that engine and might be able to use less. What is the idle RPM in Park right now?

 

[sreidmx]

I agree, if that doesn't have a very big cam or requires a higher idle for vacuum I'd run a 1800-2000 and max a 1900-2100

 

[wildweaselmi]

Ended up getting a Hughes Performance 3stage 2200-2400 rpm stall. Works much better.

 

[Greg Ducato]

Good choice, Hughes builds a nice converter.

 

[retroblazer]

I would agree with an earlier remark that your gearing is on the high side. I run 4.88's in my Sub with the same 383/4l60e with 315's.

 

[wildweaselmi]

I would agree with an earlier remark that your gearing is on the high side. I run 4.88's in my Sub with the same 383/4l60e with 315's.

I can agree. It's a bit sluggish on take off but some semi minor upgrades should increase torque and HP that I'm hoping will compensate for the lower 4:56
Still fine tuning. I feel the 6" BDS suspension leaf spring kit raised it more than I expected (which helps that low hanging transfer case). Wish I spent the cash for coil over suspension but coulda, woulda, shoulda doesn't help.
I'll run what I have at the moment.
Have a bad vibration and I believe it's because the shim is wrong for the rear axle. I have no angle on my u-joint. It's pretty much a straight shot pumpkin up to cv joint at transfer case. That's the next fix

 

[sreidmx]

With a cv it should be like that anyway..