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From a typical B&M kit.

That heavier spring in the throttle valve circuit will also affect WOT shift points, along with grinding the valve.

I just did one with the motor home swap. The one I used was a 76-78 440 18,000 GVH unit and it was a tough transmission. if you can find one, they have some HD stuff in them. Of course, you need to switch the output shaft and extension housing but when going through them anyway, that is not a...

I vote 9 or 10 springs with the 3.8:1 lever and stock or slightly increased pressure regulator spring.,

Cuda, the planet carrier should not stick out of the ring gear assy. like it does in that image. is it missing the thrust washer inside (for the photo anyway) ?

Turndowns and flowmasters will typically resonate as will any muffler with turndowns. Add tailpipes and it'll help a ton! :):)

Thanks 331. I just heard a 520 cu in Jon Kaase Ford with these MagnaFlow-style mufflers and it was impressive.

Dynomax 17748. 20" long body. 2.5" in and out, offset in and center out. Bolt right on. Work great. Perfect muffler when mounted correctly.

James, You need to fit the 5" by 11" by 21" Magnaflow on it. They sound good, flow great, do a real nice job of toning it down and will not resonate too badly if they mount them correctly. If there is still a 5 by 11 Superturbo, it is even better if it is the long body one.

Some car guy, if that is an open box inside that junction, I'd be hesitant to use it. I am not sure what the benefits would be, if any. Pypes' X-junctions are much closer to the original Dr. Gas X junctions.

I have no idea from the photos what is going on in that Flowmaster junction. Must be something new they are doing? I'll go see from their site what it is internally.

We tested the Raven and it was uniquely made muffler. I'll see if I can find my old ads for it. They had sort of like a channel through them with perforated walls on both sides of the channels. Sort of loud I recall. Expensive to make I bet.

Vibrant is a straight through packed muffler with a perforated core. It does not appear to have the center perforated core wrapped with stainless but the entire volume is filled they said.

Somecar guy, I can tell you they will likely sound very much like MagnaFlow mufflers. They are made very similarly and with a 16" case size they will be sort of rumbly. They may not resonate much but hard to speculate with info you gave. A better choice if you care about sound levels would be...

VSJ, this book explains a lot of what you need to know to do it yourself.

Thanks Doorkicker for the kind words! Tom Hand

I ran them for years as does Dad. Drone is very minimal IF the exhaust is suspended properly. Around 2000 to 2200 rpm you can detect it but way less than most any other mufflers we tested.

JG, that will be a great choice. The 17748 does everything very well. It flows well, sounds good, and is relatively quiet but has some tone. Be sure they hang it with "as stock of hangers" as you can find. No solid rods welded to the muffler and the brackets. :):)

Joe, no sir. I am not an expert on those and would never pretend to know enough to write honestly about them. I'd suggest a factory shop manual and pay attention to the tools and safety suggestions they have. Tom

This one!