AWD swap problems...

[jjgrizz73]

Hey everyone, so I finished up the swap a few weeks ago and didnt get to drive it due to the snow. It moved fine so I figured everything was A-ok. I went out for a drive today and found a pretty large problem. The car grabs as if the wheel is hanging up in the back. I threw it on the lift to see how the tires were spinning. This is what I found:
1)Spinning the rear drivers side does nothing but spin the pass. rear in the opposite direction
2)Spinning the rear pass. side spins the front pass. side same direction (in neutral, no fronts in gear)
3) Spinning the front tires spin both fronts and pass. side rear tire( in neutral only fronts in gear)

Also you can push the car until a certain point and it just grabs (not in gear or ebrake on). After not being able to push it I jacked it up and noticed the rear tire grabbing and spinning until it was off the ground then spun freely. It seems like gearing or something.

There is a matching AWD trans and Tcase (early 2g) with a non lsd rear. Thanks for any help my knowledge of how the rear awd parts work is small at best.

 

[Sp1kE]

What year of rear end do you have in it? The late 2g's have a different ratio.

 

[DSM_PWR]

Do you know if the rear diff is an auto/manual?

Found out their different gearing a whiles back and had to sell my LSD auto for an LSD 5spd

 

[jjgrizz73]

They said it was a 95 non lsd manual which is what i have...along with the early Tcase

Letters on rear diff is (BFB) anyone confirm? I forget if I took their word for it or looked up the code for manual non lsd.

Heres another thing, this motor, tranny, and tcase are out of a JDM motor either a Evo3 or something else Im not quite sure. But im pretty sure it wasnt an eclipse motor.

UPDATE:

I threw the car on the lift and ran it. By rights I believe the 4 tires should spin. The front two did but only 1 rear wheel did. The other seems to be locked (drivers side). Im not sure if misadjusted parking brake would do this or if its something more severe? Worst part is it put so much stress on the driveshaft it blew the one universal out. True maybe one clip wasnt in perfectly but spinning in the air shouldnt cause that much binding correct?? Thats leading me AWAY from the gear ratio problems...

 

[twicks69]

What is the transmission code? It is on the side of the bellhousing.

It should read something like: W5M33-2-NPXV, etc.

The Evo 3 transmission and transfer case both have different final drive ratios than the DSM rear end -- you cannot run the Evo 3 transfercase whatsoever with a DSM rear end or transmission. The Evo 3 transmission requires the swap of the front differential ring gear and output pinion gear shaft to get the proper ratio to be used with a USDM rear end and UDSM transfer case.

 

[tenn-gsx]

What year of rear end do you have in it? The late 2g's have a different ratio.

The way you wrote that will lead someone to believe that the later 2g awd has a different gear ratio in the rear diff from the early 2g. This is not true. The M/T ratio is the same on all Eclipse and Talon rear diffs.

Where you run into a difference is in the Evo drive train as stated above. OR in the center diff and transfer case ratios. However as long as you match an early 2g tranny with an early transfercase they end up having the same output ratio as the late 2g. In other words as long as you match the tranny and transfercase generations correctly then there is no issue. You will bind the drivetrain if you put a 99 transfercase on a 95 transmission though.

 

[jjgrizz73]

I was under the impression the transfer case was gearing was the same as the early 2gs? I did the identification Jacks Trans. put out and got the 12 turn lineup. But maybe its a coincidence. Now another question is having it in the air, would the ratio difference lock just one wheel up? Or am I looking at possibly a rear diff issue?

 

[eclipsh]

If you're locking up one wheel it has to be something with that wheel or the transfer case. Sorry you're having trouble. Good luck with it.

 

[jjgrizz73]

Yes, its only one wheel (driver side rear) locking up...the drive wheel (passenger rear) is spinning fine thats why Im lost...

 

[black_gst]

if its one wheel its got to be brakes...

are you using lsd or non lsd axles? i dont know if it matters but just something to look into

 

[jjgrizz73]

Well I looked it up. Its an Evo 1 GSR gear box with a 3.909. My rear is a USDM 3.545. Would this cause the locking up of that one wheel so badly? Im on the hunt for a new ring/pinion for the rear

Update:

I talked to shep for a bit last night. He seems to be going on the route to replace the final drive in the transmission. Probably will be ALOT easier to find not to mention cheaper since the supply of 3.909 rear gearing is small. I just hate doing transmission work myself im just not comfortable with it Ive watched and helped my pops a million times rebuild Muncie trannies but these are different to say the least .

 

[jjgrizz73]

Still confused on what to do guys... Shep and TRE are saying to replace the trans final drive gears while Jacks said it shouldnt have locked up on the lift which makes sense too. Im not 100% sure if it locked up though the driveshaft ujoint snap rings may have not been in all the way and it could have been just the Ebrake hanging up alittle and needed adjustment. I dont know which way to go, I want to change the final drive, any opinions?

 

[Afroclipse]

Are you sure its not the brakes locking the tire, that should not happen because I drove my RVR transmission for a while before I switched gearing and felt no difference. Tranny shifted fine, what is crazy is that your rear is not lsd so I am guessing the main gear is the issue. IF there was an issue it would be your centre diff going out but this case its your rear, get another rear and call it a day. If you have your old rear just have a shop switch the gearing into your old diff. If you are lucky like me your old diff(auto) is lsd so that way you have an lsd rear conversion.

 

[jjgrizz73]

I wish I had a 3.909 rear gear set I really do. Its not the center diff thats welded when I was running FWD with an AWD tranny. Any thoughts on possibly the Tcase or does it sound more like the rear diff?

 

[jjgrizz73]

Just put the tranny back in with the eclipse 3.545 gearing and it runs perfectly! Thanks for all the help esp to Shep. Thanks again guys