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Torque Converter Help Please

wildweaselmi

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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.
ht383_1750.png
ht383_2625.png
ht383_3500.png
ht383_4375.png
 

bigblock72

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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.
View attachment 217207
View attachment 217208
View attachment 217209
View attachment 217210


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

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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

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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
 

retroblazer

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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

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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
 
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