Hey all,

I have a 92 Fulsize Bronco. about two years ago I converted to mas air (FMS Lightning MAS Air Conversion), stoked the motor to 393 , and have gt40 heads and intakes. The truck has an E4OD.

I just had a new TC installed (lower stall speed - B&M ). I drove it from the shop to a fab shop that is doing my cage. All was fine, about 150 miles total). Well today at the fab shop when moving the truck into the bay a very LOUD vacuum sound was coiming out of th eair box when the truck was put into a drive gear or reverse. It quickly stopped when in park or neutral.

Any thoughts?

Thanks,
Chris H

hrm... could be the motor sucking in air??
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naw :flipoff2:

you think? There has always been the air -rush sound, but this is much louder (very annoying loud) and only when in gear. As soon as it goes into park or reverse it quites immediately.