Need new AOD Transmission, which torque converter? - FSB Forums
 
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post #1 of 9 (permalink) Old 06-29-2012, 01:46 PM Thread Starter
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Need new AOD Transmission, which torque converter?

I'm thinking of buying a new AOD from Monster Transmission. I'm looking at this one:http://www.monstertrans.com/store/pr...ssion-4x4.html

I want to get a Torque Converter with it. I tow ( under 2000 lbs) and 4 wheel with my truck in addition to being a daily driver. I ve heard for towing you want low stall speed and low stall speed is good for gas mileage too. What is the factory stall speed for a 87 AOD with a 5.0? Look like there's two different stock stall speed converters. They have factory and performance torque converters......I'm looking at these three:

Factory Low Stall Converter: 1300-1600 rpm
http://www.monstertrans.com/store/products/AOD-Torque-Converter-1300%252d1600-Low-Stall.html

Factory High Stall Converter: 1700-1900 rpm
http://www.monstertrans.com/store/pr...900-Stall.html

Or the lowest stall "Performance" Converter: 1600-1800 rpm
http://www.monstertrans.com/store/pr...Low-Stall.html

The performance one is more heavy duty with an "overdrive damper". But on a truck , don't you want the lowest stall speed as possible? The low stall factory converter says for 351w only and I have a 302, but Monster says the factory low stall would be the best for my truck even though I have a 302. Or would the performance converter be better with the added "overdrive damper" although its a higher stall by 200-300 rpms?
Thanks
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post #2 of 9 (permalink) Old 06-29-2012, 01:49 PM
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Originally Posted by asdaven View Post
Factory High Stall Converter: 1700-1900 rpm
http://www.monstertrans.com/store/pr...900-Stall.html
You want this one for your 302

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post #3 of 9 (permalink) Old 06-29-2012, 02:37 PM
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Interesting topic.

Agreed with Gacknar about the selection, but I may add a little to explain.

A converter is not really a converter, it is a multiplier. Should actually be called a torque multiplier in fact.

Ok, that being said, the small displacement engine cant benefit from a very low stall speed, because it just does not create enough torque at the very low end of its rpm range. larger displacement engines can pull from very low rpms, and these larger engines can find many benefits.
However, this is not the case with your 302. Your 302 is going to need a little help. Torque is not quite where it needs to be, and a few extra rpm's can make a huge difference. A slightly higher stall speed is rather helpful.

Note, higher stall speeds also generate some heat. Heat is not a transmissions friend.
Keep you new trans cool with a larger aftermarket cooler, and now would be a great time to add a trans temp gauge.
You will be spending a pretty penny for this new transmission, its a good idea to spend a few extra bucks to help maximize the life of your new investment.
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post #4 of 9 (permalink) Old 07-09-2012, 08:37 PM Thread Starter
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I was gonna go with the lowest stall speed for maximum fuel economy but now I'm not. The performance converter is about the same stall as the factory and is more heavy duty. I might go with that one even though its not necessary, but I figure it ll last longer. With that said about a small displacement engine like the 5.0.......would it further benefit from the next stall speed up, which is only a slightly bigger stall, a 1900-2100 rpm converter? And yes , I will upgrade the cooler and add an external filter, these trannys produce a lot of heat. I also might see if Monster can install the wide range 4R70W planetaries in my new Tranny.
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post #5 of 9 (permalink) Old 07-12-2012, 11:45 AM Thread Starter
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Looking at a graph of the powerband of the 302, y all are correct. Peak torque is at 2400 rpm and the converter is supposed to lockup 500-750 rpm before that point. Which puts it around 1800, which is stock stall and the most effecient stall. Surpisingly the 351w has peak torque even higher at 2800 rpm , however the torque band is much larger, which is why it can take a super low stall like 1500 rpms. I'm gonna go with this torque converter:

http://www.monstertrans.com/store/pr...Low-Stall.html

Basically factory stall speed, but is a heavy duty performance model and probably firmer lockup than the stock one. Yeah it's 1600-1900 rpm stall, but I'd imagine with our heavy trucks its be on the higher end of that at 1900 rpms. So, if I went with the 1900-2300 rpm one , it would probably lock at 2300 rpm which is too high and I'd loose torque.
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post #6 of 9 (permalink) Old 07-13-2012, 11:44 AM
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Quote:
Originally Posted by 75F350 View Post
Note, higher stall speeds also generate some heat. Heat is not a transmissions friend.
Keep you new trans cool with a larger aftermarket cooler, and now would be a great time to add a trans temp gauge.
Werd. 170* F. is the max temp before the fluid begins to break down.

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post #7 of 9 (permalink) Old 04-11-2013, 03:08 AM
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Don't mean to hijack but I don't know which converter to get either I'm running a 351w AOD combo.

1300-1600
http://www.monstertrans.com/store/pr...tml?fullSite=1

1700-1900
http://www.monstertrans.com/store/pr...900-Stall.html

So I just saw on the 1700-1900 it says for 302 and 6cyl. Does that mean in should go with the 1300-1600 stall?
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post #8 of 9 (permalink) Old 04-11-2013, 12:55 PM
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Does that mean in should go with the 1300-1600 stall?
Yes, if your 351w is not modified.

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post #9 of 9 (permalink) Old 04-11-2013, 04:36 PM
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