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TC help and advise

B

bad larry

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May 16, 2010
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Evening all, I'm wondering if anybody could tell me what the TC stall speed would have been on an 88 v30 4x4 equipt with a 454 TH400 and 3.73 diffs? Reason I'm asking is I've repowered w a 4/425hp BB and I'd like to go with a slightly higher stall. Any suggestions or feedback is welcome. Thanks.
 
I don't think I've ever seen the stall listed for the trucks. Some of the specific car applications (Buick GN for instance) there was enough interest and few enough years/applications that they got the info.

On the trucks, there were so many combinations and variables, I don't think it was ever worth anyones time.

Stall speed is going to increase with increased engine output, but that's not going to tell you much unfortunately. :(
 
Thanks for the words! I'm 500 miles away from my rig right now, if I was there I'd figure everything out by the original TC numbers. From what I'm lead to believe it should be around 1800 stock. I'm thinkin 22-2400 would be pretty decent...
 
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My uncle is a trans guy. He said that stock pickups average around 1700. Mine is a 79 c20 and had a 350 and th400. It now has a built 406 and a built th400. My TC is an RV/towing unit which is supposed to lock up more fully (they all slip a bit) and it is supposed to have a lower stall speed. He did say that they can vary quite a bit. My K5 is an 88 and has a stock 5.7tbi and a 700r4 with a few upgrades. It seems to take a bit more throttle to get it moving than before the trans rebuild.

Wish I had more details for you.
 
You can call around and ask the TC rebuilders, but they won't make any promises until you give them the numbers off the old converter. I think stall speed is rated in a standardized way, so you can compare "looseness" based on numbers. In use, the actuall stall speed will vary by a lot of things on the vehicle. Stock was probably about 1800, give or take. In general, stall speed should go up as the cam gets bigger, but I think a heavy truck needs a lower stall number than a lighter car, for the same engine. Find some guys with similar engines and similar uses for the truck and see what they run.
 
TCs are spec'd based on the engines power/torque curve, gear ratio, tire size, etc. Not really by "a little higher than stock".

Lots of torque down low and you will want a lower stall TC to use that power. If power is built more towards the top end you will want a higher stall speed. And so on and so forth.

Talk to a trans shop or TC builder and they should be able to work out what's best for your application.
 
Your stock converter was factory rated at about 1400 rpm and should have a small #4 or D4 stamped around the circumference of the converter. As others have advised, selection of the proper stall involves cam and engine specs, vehicle weight and usage, gear and tire size etc. The more info you have the easier it will be for the converter manufacturer to build the appropriate stall speed and converter type for your application.
 
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