mustangman03

I recently purchased a 96 cobra vert with a bad trans, so I installed a used one with really low miles. I also put a new clutch, pilot, and throwout bearing while I was there. I had the stock flywheel resurfaced. Its been doing fine until here lately I noticed a light roaring sound only in first gear and at low speeds 10-15 mph. If I push in the clutch it goes away, and it doesnt do it in second or reverse. I didnt notice it until I took it to the track this past weekend, but I don't recall ever just creeping around. I'm just wondering if you guys have heard anything like this before.

cliffyk

What fluid are you running in the tranny?

mustangman03

Dexron 3/ mercon

cliffyk

While it could be a TOB issue, you might want to try loading the transmission with Mobil 1 ATF.

Many people use it in the T-45 (both Borg-Warner and Tremec) and Mobil has stated explicitly it is a suitable alternative for Mercon (plain ol' Mercon). My brother's '99 GT with the Tremec T-45 quieted down quite a bit when he changed to M1...

mustangman03

If it was the TB wouldn't it do it in every gear instead of just first. I'll give the Mobil 1 a try it bugs me. You don't hear it driving normal but if you just let the clutch out and roll on first it makes it.

cliffyk

Sometimes road noise masks sounds that are first heard at lower vehicle speeds...