Thread: Mfactory Final Drive Failure?

and you can say the same as him, you haven't had any problems yet, doesn't mean it wont happen, doesn't mean it will, but i hate people who come along and say 'well my one didn't do that' so the part must be good. mfactory parts have quite a high failure rate, a google search will show you that, thats all i'm saying

I was just giving the forum members some feedback, as not to many people instals the MF Final Drive. If you posted your failure, is because you want to know if it happened to somebody else, you should know that there "might" be people with your same problem and some that don't. Sorry to hear about your FD failure!
I also edited your comment...

I didnt employ that there build quality is poor at all, And there service was great, But only thing needs replacing in mine is a final drive, Bit odd , Its dragging out abit now with not much Happening ,Pretty Much Blaming everything bar the final drive, But im still awaiting Word back on replacement Price or what they can do

And I orignally only posted to see what others Taught, Wasnt really trying to deter Any one from fitting or dealing with mfactory

one or two failures is an acceptable failure rate for this type of part imo, but the amount of mfactory failures throught the modified car scene seems really high to me, so its not one person saying the part is crap macrakin, there are lots

some of the responses here just seems like fanbois who don't like there part purchases brought into question? or do you hold stock in the company? why else do you feel the need to defend them when even mazworkx is posting to clarify its not their manufactured part, and they sell the thing lol

... --- ...

No fan boy here happyharryskunk. Like I said on the earlier comment, just giving my feedback, anyway do you even own a MF Final Drive??? If the product Fails on other brands, it doesn't necessarily mean that all their products are going to have the same outcome.

D_turbo hope you get this sorted out with them and have the car running soon!

Don't know if this helps, but mine has given me no probs

Just a thought. That final drive gear mates to the input shaft, just above/behind the input shaft bearing. In my B15 SE tranny, the bearing began to fail from heat, the metal that spaces the bearings tore at the rivets. From what I've heard, this bearing does not get lubricated very well and can fail when driven for long periods of time due to heat build up. I was driving about 500 miles a week, minimum, on a short ratio tranny at sustained high speeds as well as city.

I've also head some Hondas have a similar design challenge.

The trashed tranny I received looked as if the metal became heat fatigued. Some teeth on the input gear shaft shattered, while a few on the ring gear looked as if you heated the metal like hard butter and tore a chunk out.

I don't think the tranny was ever serviced. My guess is the oil was the original, driven to crud and the tranny failed on a highway drive. It still worked fine, just clacked loud as heck. Works just fine with a new main shaft and ring gear, VLSD survived as well.

Please could you show me some of these "really high" examples that are NOT Subaru 2nd gear or Irish Rally related? I think you'll find that we actually have one of the better success rates. Don't always judge just by what you see online as there is always another side to the story.

If a part has a 5:100 failure rate, and another 1:20, you would automatically assume the former to have the higher failure rate when, in reality, they are both the same. You just notice the "5" more.

We have only ever made 1 batch of the Nissan SR20DE 4.785 Final Drives, of which 50pcs were made. As all of our final drives are forged and are made in batches rather than individually (as with the case of billet pieces), they are all metallurgically identical when they leave the production line. If 1pc has a metallurgic or design issue, then so will most of the other 49pcs. However, from the 50pcs sold over the past 23 months, this has been the only reported failure.

there are simply so many variables involved in a transmission that it can be very hard to tell what exactly went wrong once it is installed and run in a car. For this reason alone, we do not warranty our parts once they are installed and run. We only provide a warranty against manufacturing defects (i.e machining errors) upon receipt of the part and initial installation. If there was a manufacturing defect, this would have been noticed upon inspection and installation if the installer was a professional, and we would have provided a replacement free of charge under warranty.

the reason for asking if Johnny had done any sort of racing or aggressive driving is not because the final drive can't handle racing (even the stock fd is fine on the NA cars), but because a lot of drivers don't know how to pre-load their transmission. They go from zero load to load like an on/off switch constantly, and then wonder why their parts are breaking.

I forgot to reply to Johnny's "professional answer" to my question in my last email to him, but it is not what his "professional" is talking about. I was referring to pre-loading the transmission using the clutch/brake; not pre-load settings inside the transmission.

installation (shimming, tolerances etc), maintenance (fluid type and changes etc) and drivetrain setup (clutch etc) are also important factors in the longevity of your transmission. Unfortunately, as the manufacturer of the part, we are always to blame when a failure occurs; it is never the fault of the installer (what installer will ever admit they done bad work?) or the driver (what driver will ever admit that he drives badly?), and we are immediately expected to provide a free replacement or refund, otherwise the bad press on online forums will begin.

unfortunately, with online forums, no matter how good your intentions are (i.e just to inform other people) and even if the issue gets resolved amicably, 90% of people will still just see the word "failure", and then the association starts and spreads down the grape vine. It is rather unfortunate that this has already started in this thread; and this is the exact type of thing that sways us manufacturers away from creating new products for you guys.

we are working with Johnny on this, albeit not as fast as he would like however due to our busy schedule (SEMA and Macau GP) and for that, I apologise.

question for mfact. is since hearing of this issue with johnny have you made contact with any other customer to see how well the product is doing? there are quite a few ppl thats still interested in ur product n the support u have given Nissan... thanks for that and thanks for responding to this thread....

To clear that Up, I answered Your Questions as you Sent them, I Am FULLY aware of how to preload A clutch , But as said in the First Pointed out, That was in relation To Diff Preload Settings And shimming Throughout the Box, Not Involving How I Use the car

And Once Again Thanks For the Reply, and there was no Harm ment in this Thread, If It had been My Standard Final Drive, i still would have Put up this Thread and asked for opinions, It Is NOT to Slate The company Or Products, Simply For Advice, And As iv Said I have recommended ye to several UK and Irish Members, So once again, no harm Done, Im no mechanic So I wanted opinions,

Johnny