Does anyone know any places the weld differentials? Also how good and how long the welds lasted thanks!

 

If you plan on using a welded diff on the streets it's gonna be an ugly scene

 

I can do it.
It is not the welds that fail, but more of the axle stubs snapping - at least, in my experiences.

get me beer and a roll or two of flux.

also - how did you make your name red?

 

wait it will snap?? is there anyway to prevent it? and im not 21 but i can give you money for beer haha

 

Sound's like you need to do ALOT of research on this forum as well as other good forum's about welded differential's and how they stand up on the street.
I bet howstuffworks.com has a write up on welded differential's....

My first question is why?

You WILL be buying tire's very often as a welded differential means that both tires turn the same at all time's no matter what.
When you make a turn the inner tire turns at a different speed than the outer tire does, common sense says that if you weld it solid it might not turn out too good...

You'll be eating tire's with every turn that you take. You know that wheel chirping sound that you hear welded differential car's make? that's the sound of the inner tire skipping on the road because it can't turn as slow as it need's to because it's welded solid to the outer tire that need's to turn at a different speed.

If you want to drift and will be doing it 24/7 then weld the differential to save some money for now as I know that those Kaaz LSD unit's are $$$.
If it's your daily driver or if it see's more than 3 days a week of street use then don't weld it. You'll just be another 240sx ricer fan boy with a welded differential that is trying to drift better by welding their differential.

****'s old and really annoying, I see at least 3 of them on my drive from my house to my shop which is only 3 mile's away...


Here's some spoon feeding for you though, the failure is not the weld's in the differential it's the stub axle's that snap because they weren't meant to take that kind of abuse. Remember, it's welded solid now and that inner skipping tire is also an inner stub axle getting jarred by the skipping tire on every single turn that you make.

 

just get a LSD frm a GTU it will make u happy...

 

A 20+ year old LSD unit is useless unless you rebuild it or get lucky and find a low mileage unit. Which the lowest price I could find to build one for was almost as much as getting a Kaaz or other type of differential.

If I remember correctly the part's alone cost a little over $550 by themselve's from mazdatrix which was the only place other than Mazda that I could find that sold the clutche's for the LSD unit.
He will then need to find a good shop to rebuild it for him because it's not just a matter of throwing clutch packs in it and going, it has to be shimmed correctly and torqued correctly otherwise it'll crap out early or not even work right.

After he buy's the $550 in parts + shipping and pay's a good shop to rebuild it for him he will probably be looking at a $800 or so bill which will get him a good Kaaz or other style LSD unit.

Also a little more info is that the newest LSD unit you can find in a used Rx-7 is from the 1991 S5. The S5 LSD unit's are useless as it's a viscous style that once it wears out is dead because it uses a special viscous fluid that can't be replaced. They also don't grab as nice as a clutch style due to this viscous fluid that is used in them.

So he's looking at buying at the least a 22 year old S4 clutch type LSD for $50 - $250 and will need to cross his fingers that it will work.

There is also 4 different kind's of stub axle's between the S4 and S5 model's that cannot be used in place of each other due to their different lengths. The viscous have one length style while the clutch type have their's and if I remember correctly the n/a and T2 vary in stub axle length's as well... I may be off on that information but it can be found on Mazdatrix website in the axle and LSD section.

Please think before posting next time, correct sentence structure and full word useage would be nice too...
Posting something like that will make someone who is new to the Rx-7 world to believe you and just go out and buy the first LSD unit they can find and not know that there is a huge difference in LSD unit's out there for the FC3S Rx-7.
They then end up in a mess because that new to them LSD unit doesn't bolt in correctly or doesn't work for crap or they don't realize that it didn't go together correctly and could cause serious injury to them and other's on the street's when they go to drive the car.

 

^^ this guy speaks the truth

not to mention the LSD from a GTU is ONLY true if that GTU was a 88
All other GTU has your standard open LSD.

I can still weld the diff for you if you so desire - but I bet you know the risks now

I could also sell you a T2 diff instead that has a clutch LSD that still works - however, as mentioned above, it is a 20+ years old LSD that could (like every other "LSD" diff out there) use a rebuild! I mean, it would lock perfect for drag racing applications, but for it to lock under a load (such as those in a drift, etc), it may not perform as well.... but then again, that may be the easiest diff to learn on since it doesnt lock hard or instantly???????? question mark

 

If you are set on doing this I'd try to find a ship open diff to weld so you can keep the one you have now for street and switch it for track. Otherwise you'll be going through tires like nothing. Also have fun in the rain like that =/

 

The fluid is just an additive with GL5 80-90 gear lube. It is pretty easy to find LSD additive

 

i mean i drive it to school which is like a mile, i knew what the risk were Ive been trying to drift for awhile and i love how my brothers 86 feels with an LSD but ***** so expensive and im budget minded right now so getting it welded would be my best bet? how long is it expected to last?

 

slpin dont i need like the half shafts and that other stuff so i can fit the TII Diff?

 

Do it right, or don't do it, if you do break your axles then you're looking at more $$ and possibly a LSD to keep from breaking them again... Save a bit more, wait to drift your car, and then when you have the $$ get the right parts, otherwise you'll always think "could I have avoided that accident when I slammed into the wall or whatever, when my [axle] gave loose and broke through my (insert other part)[brake line]. And then you have nothing to drive, and enjoy... Patience is not just a virtue with cars it's a necessity !

 

In my opinion its fun but its very annoying and you get this sense of paranoia when turning pretty fast or going on the freeway on a raining day.

 

Like I said buy a spare open dif and weld that. If you can't afford to buy a spare I would highly advise even trying to drift if this is your only car and especially not on the street.

 

willa 3.90 gxl welded differential work on my convertible?

 

WHA? bird is the word?http://www.youtube.com/watch?v=2WNrx2jq184

i got a s4 diff frm the junk yard for 45 bucks and it locked up every time i needed it too... you dont need to be a dick in order to prove ur point guy. we all know you know ur stuff.....