Diff problem-need help
 

Hi guys,today i installed a jdm 4.3 diff and i have big problems.I went for a test drive
And the diff is fully locked.is it possible that i messed up something during
Installation?like putting the driveshafts wrong or the pins of the driveshafs got stuck somewhere inside the diff.I am running out of ideas so any help would be aprecciated..

In case you guys are confused with word "driveshaft" i mean "side axles" :-)

If all you did was install a complete 2nd hand diff, I suspect the carrier is the problem.
Could have been setup that way.

Chuck,thanks for the reply,i am pretty sure that the diff is
Not tampered before.Any other ideas guys?

Get the car up on stands, drain the diff and pull the rear cover.

Make sure the parking brake is off and the transmission in in neutral.

Then you can turn one of the axles and see what is going on.

At which point you may need to disassemble and correct what is wrong.

Been there, done that. Better to take it all apart now and get it right.

Here is a pic of the diff,it seems that there is a stopper where the two sideaxles meet

And here is a picture if the old diff

Thanks for the advice,but if i open it,i cannot return it.

I wonder what kind of diff that is.

I would lift one rear corner, put the trans in neutral, and see if I can rotate the lifted wheel.

The answer to this is no.It is fully locked,100% maybe modified for dragster or track?

If it's locked then it's locked. Presumably welded (ideal for drifting...not sure what benefit it would provide a dragster though). Where'd you get it from?

Ah, I thought you replaced the differential.

You bolted the whole pumpkin (diff case) and diff into your car.

In that case, there isn't anything you could have done to it, other than forget to put oil in it. You need to contact the seller and return it.

Yup, given that it's replaced in whole and the return must be in whole, I would just trade it in.

Of course I'm intensely curious as to what's in there, but it's up to the vendor whether they want to find that out.

Someone stuck a T2 diff in that housing. Stock 3rd gen diff's are torsen LSD's and open straight through where the axles are inserted as indicated in your pic. That stopper that you mentioned is the center pinion in a T2 diff. Someone may have inserted shims or oversized thrust washer to lock up the diff.

Most likely a aftermarket diff in there, and not a FD diff. Looks like my old Kaaz diff, it was not straight trough. But had a blockin in the "middle".

So i would say it's not a stock Torsen LSD.

JT

Ok thanks for all the replies,i already swapped it with another one,and there is a huge difference compared to the stock one.Now i have a jdm trans with a.762 fifth and the diff is 4.3 compared to the 4.1 i had.For anyone who is interested in gaining acceleration especially with fifth gear and doesnt care about the increased fuel consumption is a must.

I have a series 8 JDM trans with the .806 5th and use a 3.909 diff.
Makes 1-4 gear a little taller for the 400+hp which reduces wheel spin and the shoter 5th has more accelereation.