well, i noticed a vibrating/rattling noice coming from the front of the car a few months back, i didnt think anything of it until last friday at the track. the first race the clutch spun, after that i launched at 4500. but the car drives different now, the clutch seems fine, i tried downshifting fast, but it grabs normal. when i start off from a stop, in the lower rpms i feel a slight slip, but its like sort of jerky, then if i give it gas, i hear a noise coming from the front and can feel it in the pedals. i dont notice it after 4700 rpms. but it will do it in all gears at lower rpms. the sound is like a repiticious knock or somewhat of a grind, but not too much metal. i jacked up the front of the car, and spun the drivers side wheel forward, the other wheel spun backward like it should, i didnt really notice any binding, but i could hear noise from the transfer case when i put my ear right up to it. something is deffinatly wrong, but its hard to put my finger on it, i do notice it when the wheel is turned slightly.

my question, does this sound like a bad front diff? what does a front diff sound like when its going bad? also, what else might this be?... could it be a broken flywheel, or clutch hub? what would that feel like?

tomorrow i will be draining trans fluid , if i find chunks im ganna send the case to TRE for a new diff install.

 

I hope you find some help and info on this issue.. it sounds serious. What year/model is your car? it may help with the diagnosis.

 

03 evo gsr. 40,000 miles i have talked to john shepherd and TRE and both seem to think its front diff.

 

I have a front diff in a TC I just purchased. It is in perfect shape and has about 4000 miles on it. I wont need it as I am putting in a Quaife in in it's place.

Let me know if you might be interested. -- I am not sure what it is worth.
I can get pictures on Monday if you are interested.

 

TRE has them for $400 installed, labor included. i just need to make sure this is what is going out. anyone with this problem yet?

 

Yeah, $400 plus $100 shipping plus down time.

Swapping the front diff is really easy once you have pulled the TC. A replacement diff might be a good solution assuming it is just the diff that is bad.

I am not actively trying to sell the diff, just trying to help.

Good luck,

 

i know, im also wanting to send it to make sure this is what is broken and inspect the rest... i dont have much experience inside transmissions or transfer cases.

 

however, i just remembered i have a freind who is dsm awd god, so maybe he might do it. how much do you want? are you sure the spider gears are still good?

 

The spider gears are still in good shape. Here is a pic I took while dismantling it last week.
I have never seen a diff for sale before so I don't know what it is worth. Maybe $250? Does TRE sell diffs as we could use that as a baseline.
I could have it Cryoed for a little extra if you are interested. Let me know and I will find out an exact price -- I am having the whole TC done when the Quaife arrives and adding the diff to my batch probably wouldn't add much more cost.

 

i think 250 is about right. we are diagnosing it tomorrow. hopfully its this because we can fix relatively easy.

 

Best of luck man, I hope you get this all worked out. Ever since I wrecked my evo, I have understood the pain of not driving one for whatever reason. Best of luck

 

heh, you guys are ganna get a kick out of this... i hit a rock a week or so ago, and it smashed up the under support bars, and pinned the downpipe to the subframe. this noise and vibration i was hearing was that. my freind and i diagnosed it today, all diffs are perfect, he noticed no slipping, which i interpreted slipping from the rumble of the exhaust on the frame. and there is no more than normal shavings in the fluid. only a bit of shavings on the magnetic plug. which means my transfer case, and tranny is still in great working order!! yeay!!