In first gear if I really get on it I get a pretty good rumbling sound and at around 3000 rpm I get a slight vibration. I took it to a local tranny shop but the owner thinks it is a bearing ijn the bottom end of the motor and not a problem with the clutch or tranny. I stopped at my mechanics shop today but he doesn't do bottom ends. Think I will be OK if I just have new bearings put in. The top end was done just last fall. Now I have to find a shop who does bottom ends and can compare to my regualr mechanic.

 

What motor do you have again Scat?

 

420A w/ 5 speed. 205K miles. New timing belt, cylinder head, tranny w/ clutch. The car runs and drives really good but I get a noise off the line that sounds like something is unbalanced [it doesn't do it everytime] it gets louder and more noticable if I try to accelerate hard. It started a little while ago as a slight vibration sound above 3000 RPM but nobody could find out what it was. I am taking it to a shop Monday and until then I am going to run 20W50 oil with a touch of 90 wgt gear oil to help keep it quiet. [a friend at work who is a gear head suggested I do this] I hope it is something simple cause I really love this car and don't want to get rid of. Maybe a junk yard engine is the solution. And just a thought. If the crank has to come out is there a stroker crank available as a replacement? That was just a thought cause I will probably leave it stock.

 

Oil change didn't do anything to it. I am starting to think it isn't a bearing cause I can drive all over the place at different speeds and RPM's and not notice the noise. I mostly hear it when I leave a stop light. I just do it smoother on the clutch and try to use lower RPM's on take off. I am not sure what it is yet but I will find a shop who can fix it. If I can get Mopar Action Magazine to reply they usually are pretty good with solving porblems like this.

 

check your motor mounts that is my guess my 96 did it till i replaced em

 

I found out it is the mounts but nobody has the front right mount in stock and the dang thing is $175 at the dealer. I am trying to find it at either Autozone or ebay.

 

get the energy suspension inserts
for 95-99 eclipse non turbo theyre like 20 from summit racing

 

I ended up having Mitsubishi order Eclipse mounts. I spent $175 for all four and the problem is gone. Funny how it made so many different noises from a slight humm at 3000 RPMs to a low grumble when I took off in first and just before I changed the mounts it started to clank when I turned it on or off.