Hey patrick
What are the differences if any between the 5.3 OE truck converter and the fbodys OE?

 

Gonzo,

Trucks will stall differently than F-bodies based on the torque of their motors. Take a popular converter like a Vig 3200. It would stall around 3600 in in a stock F-body and around 3800 in a heads/cam F-body (with a stock displacement 346).

Put that same converter in a 5.3L and it will stall about 3400 rpms. In a 4.8L, it will stall about 3200. It seems that Precision must have based all of their stall ratings after 4.6 and 5.0L Mustangs...that's why they are a little on the low side for GM's beefier wonder-motors.

A Vig 3200 would stall around 3800-3900 behind a 6.0L. Trucks have different converter demands based on their intended use. If you plan on towing, then you'll need to chose a larger diameter converter with more holding capacity and a larger lock-up clutch. The 278mm Yank Truck Thruster 3000 fits this bill very well. If you don't tow and want all-out performance, then a F-body converter will work just fine. Try to chose a converter with a higher stall torque ratio for a heavier vehicle though, it will make it feel less loose.

That means you want to get a converter like a Pro Yank 3400/3600 (stalls about 200 rpms less behind a 5.3) with its large 265mm clutch, the Yank Super Stock 3600 or the Vig 2800/3200. All of these converters have high STRs and will work really well on trucks and SUVs.

Patrick

 

What he said <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" /> ...I have a PI Vig3200 which they reworked a bit. I call it what it is: a 3500 stall with a 2.55 STR. The numbers work well in my combo but I have no intensions of towing or any real hauling..just tires, jack and fuel to the track. I will say the Yank is definately more suited for "street truck" use. I swithced from the YANK 3200 to the VIG to solely meet my performance needs...and I am happy with the change. Both are good products with similar gains but different character.

 

Everything you said i already know, let me ask another way. Is the truck converter exactly the same as the f-bodies?I suspect the vain /fin angle is different.

 

Gonzo, how many different ways can we say it? THEY ARE EXACTLY THE SAME!! They are completely interchangable. Got a converter from an LS-1 F-body, it will work fine in a truck (LS-1 based with 4L60E).

Now savvy converter companies will make them a little different to compliment the driving characteristics for Truck motors. Since they tend to make their torque lower in the rpm range, converters are better suited by having less shift extension to keep the shift drop-back closing to the designed rpm range of the motors. Higher stall torque ratios will help this. This has more to do with stator choices than fin angles and clearances. Towing also makes truck converters a little different. You want and need a bigger lock-up clutch for trucks. That costs more money, but when you want to have your cake and eat it too, it's a matter of getting what you pay for.

 

Ok i got it they are the same identical converter with the same part #, i know what you are saying there is a dozenvariables on how a converter will react in a givin combo, truck vs car weight, cubes,ect. i just wanted to know if they were built different.The 5.7 creates more torque than the 5.3 truck although the truck wieghts more.Simply put the fbody will act exactlythesame as the 5.3 and 4.8 OE converters got it.I understand all LS1 converters interchange and also the trailblazer ect.but maybe not the c-5, thanks for clearing this up.

 

I think this is what Gonzo wanted to know (but I may be wrong):

Physically it is the same converter, but is it stalled differently? An fbody converter in a truck, would it stall just like a truck converter? What is the stock stall rating for an Fbody?

I'm sure Gonz is thinking about which factory converter will give his truck a little boost yet not cost a fortune and is easily attainable. Sounds like the trailblazer converter would be a good choice, but would be very hard to find used.

 

stupidfast,
nice truck you got there

quick question, wont 200 degress tranny fluid eat up your tranny fast? i dont have my stall in now, but my temps dont go past 160, once the stall goes in, i will how temps are affected.

<small>[ December 25, 2002, 02:07 PM: Message edited by: rgvsierra ]</small>

 

Thank you. No cooler yet, looking at a couple. If the tranny burns up I will just have my buddy rebuild it again. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> I will have one before summer.

 

what all was done to your heads, how does the cam sound with no muffler? i'll soon have almost an exact setup like yours, with a little less stall and gears, seeing that you ran a 14.1 with a 3.0 short time, you should see low 13's. when do you plan on going to a 1/4 mile again?