AWD gearing in FWD trans

[mnetwork]

I was wondering if there was a way to get AWD gearing into a FWD. Just curious, throw some ideas at me.

 

[kewlguy]

swap in an AWD tranny?

 

[mnetwork]

An AWD tranny can just be swapped in and used?

 

[Project90Talon]

You will need the AWD flywheel, but other than that yeah, you just won't bolt up a transfer case to the other shaft.

 

[schroder]

Wouldn't that cause the Viscous Coupler to burn out? I'm not 100%, but I dont see why you couldn't swap the gears in...I think I remember seeing somewhere that for AWDs, we can swap in the FWD 5th gear, and its supposed to be taller, so we'd have a higher top speed....but I can't remember. I'd wait before swapping in an AWD tranny to get some more responses though. Good luck!

**EDIT**The other problem you face is with the output shaft from the tranny to the T-Case. If your not using the T-Case, and you leave the shaft in, it will continue to spin with nothing balancing the other side or keeping the output shaft from coming out. When the shaft falls out, you will lose all of your gear oil. If you TAKE the shaft out before you put the tranny in, you still wont be able to fill it with fluid. Just some more thoughts or opinions on it. G/L!

 

[Project90Talon]

If you remove the shaft and weld a plate over the hold wouldn't that solve that issue?

 

[->PrOjEcTGS<-]

Where do you guys get all this misinformation??? Let me try to answer this as best I can.

No gears can be interchanged between FWD and AWD transmissions Except the 5th gear as the input and intermediate shafts are different between the two.
Gear Ratios
FWD 5th gear ratio - .74 = Shorter
AWD 5th gear ratio- .66 = Taller

The Final drive ratio on the FWD is taller than the AWD which makes the 5th gear roll out to about the same speed. Now if you were to put the AWD 5th gear in the FWD you would have a taller 5th gear and vise versa with the FWD gear in the AWD = way shorter.

To put an AWD trans in a FWD: AWD Flywheel, AWD clutch, I'm not sure if the axles are the same or not but you might need AWD axles, and a VCE (Viscous Coupler Eliminator). <--- That part is how all these AWD guys put their cars on FWD/2WD dynos.

 

[mavisky]

Awd transmission + VCE = FWD with AWD gearing and then you can use all the upgradeable parts available for the awd transmissions including dog engagement gears if you wish.

 

[mnetwork]

I have always thought that AWD gears were shorter and better for 1/4 mile... this isn't true?

 

[mavisky]

They're shorter, but that will also multiply the torque going to the wheels and make it easier to spin as well. It's really up to you to decide if it's worth all the money and labor for a slight improvement in gearing.

 

[1qkfwd]

I have had an AWD trans in my car for 5 years now. I got it form TRE. There was no output shaft for the transfer case. The hole was block with a plate and JB weld. I have not had any leaks from that. I just had Jon convert it back to AWD. He needed me to purchase a new center diff. On a low powered car maybe up to 450WHP the trans was awsome. Over that you get way to much wheel spin even with 26" slicks. Over that power the FWD trans would probably be a beter bet.



EDIT: I had to use the AWD driver side halfshaft axle. The passenger side axle I was able to reuse.

 

[->PrOjEcTGS<-]

They're shorter, but that will also multiply the torque going to the wheels and make it easier to spin as well. It's really up to you to decide if it's worth all the money and labor for a slight improvement in gearing.

No they're not. FWD gears are shorter than AWD. What you are mistaking is the fact that the FWD final drive is a taller ratio than the AWD.

The lower the number the taller the gear:

FWD 1st - 3.083 - Same ----- X final drive: 12.80 - taller
AWD 1st- 3.083 - Same ------ X final drive: 15.19 - shorter
FWD 2nd- 1.833 - Shorter ---- X final drive: 7.61 - taller
AWD 2nd- 1.684 - Taller ------ X final drive: 8.30 - shorter
FWD 3rd - 1.217 - Shorter ---- X final drive: 5.02 - taller
AWD 3rd - 1.115 - Taller ------ X final drive: 5.66 - shorter
FWD 4th - 0.888 - Shorter ---- X final drive: 3.66 - taller
AWD 4th - 0.833 - Taller ------ X final drive: 4.10 - shorter
FWD 5th - 0.741 - Shorter ---- X final drive: 3.05 - taller
AWD 5th - 0.666 - Taller ------ X final drive: 3.28 - shorter
FWD Final - 4.153 - Taller
AWD Final - 4.929 - Shorter

Now how it feels like the FWD gearing is taller is all in the final drive.