S14 non-abs R200 w/ S15 HLSD + 3.91 J30 R&P?

[600supersport]

I have the S15 HLSD with the correct 6 bolt output shafts to match.

I also got a complete J30 R200 diff (5 bolt outputs) from a '93 or 94 to use the 3.91 ring & pinion.

I have a non-abs S14 (stock driveshaft). I know the HLSD should be a direct fit, but since i added a good amount of power, the 4.08s seem a bit too short which is why i went for the 3.91s.

I'm about to tear the whole rear end down soon to do all the bushings poly/aluminum and put together my ideal R200, but now i'm a bit unclear if the J30 R&P is going to work with the "ring thickness" this and "housing length" that, then J30 axels or different driveshaft if the correct housing is longer? I thought i was confident before i bought it, but it'd be nice to make sure before i do if anyone cares to confirm or deny for me that the J30 R&P is gonna fly...

[g00se]

same but if your are making that much power go with a q45

[600supersport]

can anyone that's actually don't this combo or something like it chime in please. I thought this would all go together into my s14 VLSD diff, but the 3.91 ring is 1/4" longer than the 4.08 and won't allow the whole diff to fit into place...unless I just have something set wrong.

[jr_ss]

Do you mean a .250" wider? You may have to change out shim stacks to get the unit to fit in there correctly. It's not always a direct swap/fit.

[600supersport]

yeah, it's .25" wider. there's the 2 small washers that are maybe 1-2mm wide and one 'larger' spacer that's closer to 6.4mm or .25". I didn't even try installing without that spacer or even measuring it yet. do I have to have some kind of spacer if it fits really tight without it (if I don't have to just change the spacer size)?

[jr_ss]

You don't have to have a shim/spacer if it fits tight without it, but it needs to be setup up right. If you have an FSM, I'd read through the differential setup section for specifics.

[600supersport]

deciding to reassemble at 12:15 am was a mistake, it was just a matter of getting the spacer and washers in the correct order and took no time.