Going to be modding my awd tranny to an exclusively fwd tranny. CraigB has told me that i will be needing to weld my differential and install a viscous coupling eliminator kit. I have found one at Mach V motorsports for 150$. Anyone know where you can get one for cheaper, and if this mod can be used for daily driving?

Just for more information i bought a wrecked 1gturboawd for 500$ and am doing the engine swap into a 1gntfwd that i bought for 1200$. Anywho, i have read that you experience problems like wheel hop/skip during turns. Considering my car will be a daily driver (and i want it to handle well), will i be better off buying a fwdturbo tranny, or can the v.c.e. and welded differential conversion be successfully done?

You will have to weld you center differential not your front, so your front wheels will handle the same. The center diff. does the same thing that the front diff. does except for the rear tires, so you won't have to worry about it.

will the v.c.e stand up to daily driving?

You ether weld your center diff OR use a VCE. There is no point of doing both. As a matter of fact, unless you weld the center diff with VCE installed, the odds of it fitting are rather slim.

VCE will stand up on the street, but if you are using it with a stock, 2 spider gear center diff, you can still brake the center diff.

I have been using Speed Design 4 spider gear center diff with my VCE for several years now, running low 11's and had no problems with ether part.


Leon
RR

I checked VFAQ and couldnt find anything on this subject. Anyone happen to know where there is something like VFAQ with some fairly detailed instructions? Anything would help. Thanks guys.

~I'm out like a fat kid in dodge ball~
Peace.

On a awd to fwd conversion only one part of the center diff needs welded so there is no need for a vce setup.

My buddy is real handy with a welder and i will be having him weld the differential for me. What specific part of the diff. needs to be welded and how strong should the weld be done?

Can someone explain the whole viscous coupling thing to me? and why would you guys want to go FWD? I'm not being smart, just wondering about the benefits?

I am just using a awd tranny as a fwd tranny. Thats why i am going fwd.

bmtranny lets you send your vc in and they turn it into a vce for 100 bux

Im still confused. I bought a tranny from a guy that said he did the viscous eliminator kit. He said he welded the center diff at BM tranny. my front tires spin only. Is this what this mod is mainly for? Why would someone want this?

Originally posted by Initial DSM
Im still confused. I bought a tranny from a guy that said he did the viscous eliminator kit. He said he welded the center diff at BM tranny. my front tires spin only. Is this what this mod is mainly for? Why would someone want this?

Click to expand...

This does not make any sense...

1. You ether use VCE or weld the center dof. not both.
2. End result of ether of both actions of #1, will be permanent 4x4 mode. If you experience FWD, then something broken in RWD drivetrain (ether transfer case or one of rear axles).

In ether case it would have made sense to take off the outer cover and check what you have for a VC. You can do it now in about 30 min.

But is your car a FWD, now?

Leon
RR

what does the viscous coupling eliminator kit do, it stil makes awd work, but what does it do that makes it worthwhile?

Originally posted by GRNDSM


This does not make any sense...

1. You ether use VCE or weld the center dof. not both.
2. End result of ether of both actions of #1, will be permanent 4x4 mode. If you experience FWD, then something broken in RWD drivetrain (ether transfer case or one of rear axles).

In ether case it would have made sense to take off the outer cover and check what you have for a VC. You can do it now in about 30 min.

But is your car a FWD, now?

Leon
RR

Click to expand...

Yes.
What if the center diff was welded and it broke; would that make it fwd?
I dotn understand "permanent 4x4 mode" Whats that mean?
The guy told me to turn the wheel sharp to the left and you should hear the back tires hop or chirp (?), then you should know its a welded center diff.
Only I didnt really hear that. But I did jack up the car from the front and got in the car and hit the gas and only the front wheels spun.

What if the center diff was welded and it broke; would that make it fwd?

Poorly welded center diff can cause FWD if it brakes "just right". But that is pretty rare. Usually, you brake rear DS axle or transfer case (in that order of likelihood).

>I dotn understand "permanent 4x4 mode" Whats that mean?

I do not want to sound mean, but if you have to ask this question, you have no business using locked center diff (be it welded center diff or VCE)?

>The guy told me to turn the wheel sharp to the left and you should
>hear the back tires hop or chirp (?), then you should know its a
>welded center diff.

Right... Only it can be ether front or rear tires. Ever driven a 4x4 truck in 4x4 mode on a dry surface... It is the same feeing, as it is the same drive configuration at that point.

>Only I didnt really hear that. But I did jack up the car from the front
>and got in the car and hit the gas and only the front wheels spun.

Then, most likely, you have a broken rear axle.

Come to think of it, are you using 3 bolt rear and with ACT2600 clutch and welded center diff? I would be surprised if you didn't brake your axle on your very first launch!

Leon
RR

OK, I've had the tranny on for like 2 days, and felt the problem right away as I drove it off the lot from the mechanic (they were closing)

"I do not want to sound mean, but if you have to ask this question, you have no business using locked center diff (be it welded center diff or VCE)?"


Ok, after realizing the tranny had a problem, I called the seller who then later told me it was welded. So I didnt know.

"Then, most likely, you have a broken rear axle."

Well, Im goint to ask the mechanic on monday if he saw anything wrong with the rear axle, but I'm sure there isnt because I think he would have told me. There was a problem with my front right axle I didnt know about, that he inspected and fixed, so Im just assuming. Plus Ive never launched in that car regardless. The last tranny broke because the last mechanic forgot to install the fluid after he dropped the engine back in. (mild rebuild). It had no welded diff.

>Ok, after realizing the tranny had a problem, I called the seller who
>then later told me it was welded. So I didnt know.

So this guy sells you a "street tranny", you find peculiar behavior, ask him about it and he now tell you that it has a welded center diff? If this is the case, I would not trust this person or this tranny?

>but I'm sure there isnt because I think he would have told me.

Broken DSM axles are sometime very difficult to diagnose, because they can look perfectly normal.

Basically, you have no idea what you have there... you might need to have a DSM expert looks this car over. Regular mechanic (even if he is good) would have a hard time figuring this out, especially when you are talking about weird (to them) things (such as welded center diff.).

Leon
RR

when you install a vce or weld the center diff, you are splitting the power exactly 50 50 and then you can remove the rear axles and instead of being 50 50 then its all sent to the front, if you remove the rear axles without a vce or welded diff then the center diff will blow out cuz its still trying to equalize front and back power

im not sure if your supposed to remove the axles or the driveshaft, maybe u can do either

Personally im am using a awd tranny in a fwd car so thats why i am doing the awd to fwd conversion.

16g @ 16psi, daily driver.
Whats better for me? Welded diff of VCE?

Put the car back up on the lift; all 4 wheels spin.
Semi Launched the car from a standstill. Rear right wheels spun, but car made a strange noise.
according to the mechanic, if the rear wheels spin from the lift, then the rear axle cant be broken, nor can the transfer case be broken as well.
So I guess this is a welded diff and my tires arent grabbing? Or is the welded diff broken.

Originally posted by 16GTSI
16g @ 16psi, daily driver.
Whats better for me? Welded diff of VCE?

Click to expand...

If this is the feeling of a welded diff or VCE, then I'm not happy. I would say go get a LSD like Kaaz or Quaife, which was what I was going to do before my tranny took a dump. BM tranny told me those mods are really for only race cars.

(sorry to hijack your thread btw)

He wasn’t being very clear… He is using AWD tranny on FWD car. For that, I would definitely use a welded center diff. He can still use some sort of LSD diff for the front wheels.

Leon
RR

ok well i am going with the welded diff for sure but do i also need a new lsd??