differential identification and brake caliper id
 

before the flaming please know i've searched for these specific and general topics with no help.

I just recently bought my first rx7, it's an '87 with a bunch of extras including some aluminum 4 piston front and single piston rear calipers and an lsd from a savanah i'm told. it's had the 5 lug conversion done also. well i'm trying to get some new rotors and pads and also a rebuild kit for my diff if it's a clutch type. however i can't identify what vehicle these cars are from. the guy i bought it from doesn't know either. he got the car like it is. so can anyone tell me how to tell what parts to get? i'd really like to know what diff i have and maybe what gear ratio it is.

open diff and get part number from R&P

IT depends on where you go. According to O'reilly auto parts they only have two designations beyond teh lug differences. The 4-pot front and beefy single in the rear is considered heavy duty. The single and wussy rear is the normal. The car they came from is any 86-88 gxl, tII, and GTU. If I missed one eh, im shooting from teh hip but thats the break down.

what's r+p?

GXL and TII have 4 piston front brakes and vented rear discs(with calipers to match). TII has a viscous type LSD 'VLSD' (4.10 or 4.30 ratio) so that should tell you what rear end you have if you're driving, stomp on the gas to power over into a 360 and check marks or have a friend watch the tires to see how the LSD locks up (clutch (4.10 ratio) will feel more tight and responsive if it isn't damaged. Viscous is fluid driven LSD so it's more sloppy and probably won't lock up in a 360 drift). Please don't just dump the clutch and expect to find out because any lsd will lock up with enough torque, you'll end up breaking clutch plates (or other parts of driveline). ALso, don't be a stupid ass and do it in the streets, find a parking lot or you'll be replacing everything a curb can destroy, I ONLY KNOW CAUSE I DID IT! But that's why my 86 base is now on 5 lug volks instead of 4 lug phone dials(poor dials i miss them :( LOL).

Also, the NA Driveline is slightly smaller with different flanges. if you can tell if your driveshaft has been modified to mate with TII parts(TII differential is bigger and modifiying a NA driveshaft with a TII flange is possible). Most likely if you have a vlsd then your whole rear will be TII, otherwise that'd be a lot of work for a weak locking vlsd and a heavier rear setup. On the other hand VLSD is more reliable because it isn't metal on metal like clutch. OR JUST BUY A 5.1 GEAR WITH A TORSEN UNIT FROM MAZDATRIX.COM

Also, if your shocks explode and springs take a shit make sure you get the right ones because they are also different between NA and TII.

I'm trying to keep my 86 with most NA parts because they are lighter for the weaker NA setup and keeping the '50/50' within reason.

I've heard and seen some things about the GTU and Verts being completely different specs than the rest, but idk, I don't have one.

BTW: I searched and found all the info.. google it. :balls:

http://www.16paws.com/rx7/index.html
http://www.rotaryblvd.org/lofiversio....php/t670.html
https://www.rx7club.com/2nd-generation-specific-1986-1992-17/tii-tranny-na-rearend-what-driveshaft-238434/
http://www.rotaryblvd.org/lofiversio....php/t774.html
http://www.teamfc3s.org/forum/showth...threadid=23409

If none of that helps then bust out a tape measure and find a tII then compare. or open it up(don't forget to drain).

good luck,
moki

:weedpoke: :noyes:

EDIT: I just bought a brembo brake kit and told them i had VENTED REAR DISCS and 4 piston front calipers and I have what I need.