These guys here know a shi-ton about the parts interchanges that work and don't, but this is what I know.
Quaife product page QDH8B
If you have an AWD setup, then you have a front 25 spline inner axle setup, and the Quaife QDH8B mates to it and these:
USDM Galant VR4 AWD 91-92 (w5m33) ,
USDM early DSM FWD 90-92.5(KM215/F5M33)
USDM Colt/Mirage 1989 FWD using a 4g61t(KM210/F5M31)
Sonata using the FWD (KM210/f5m31) likely 2.4 SOHC motor combo
If you run a QDH8B in a FWD setup read the paragraph below, if you installing the Quaife QDH8B into an AWD transmission, then it should almost drop in, with a little checking of the case side shims I imagine.
Best to have all components in a controlled environment/at room temperature, when setting preload/free play.
AWD diff in a FWD trans:
AWD front diffs use a ball and cage bearing setup, with different shimming due to the ball and cage bearing being considerably skinnier.
The diff will drop well below the level it should in the case and to mate inline with the other final drive gear, when installed in a FWD trans.
The shop/person installing the diff simply has to measure up the diff and shim it appropriately using the free play spec (ball and cage) or preload (taper bearing).
FWD tapered bearings use shims on the outside case to be setup for preload, the ball and cages requires careful measuring using solder or a trans case measurement tool
so that you can figure out what shims go in between the bearings and the crown gear. This is important, otherwise you have to press off your bearings and risk ruining them.
I did this while installing things in haste and not thinking it through.
Then imagine my surprise when the diff dropped into the lower case and was sitting too low.
You will need to purchase a shim kit (smaller diameter shims for the diff side and maybe some extras just in case, to be placed between the ball/cage bearing race and the diff, AND various shims for the outside (larger diameter) to spec the case to the outside of the ball/cage race.
The archives have the proper preload/free play specs for each trans type and anticipated useage and power/torque input.
link
The archive was recently updated because so many people are doing their own transmissions and or using shops to perform these swaps and upgrades.
Also, you will need a speedo gear that is pressed onto the diff housing, if this is how you pick up your road speed (to use your cluster as it was intended, versus a different speed sensor pickup device).
