94 Rearend ???

[kansasvmax94]

hey everybody. Im looking into replacing, or rebuilding my rearend in my 94 LT1 firebird. It has a 97 model TA rearend, i believe,(thats what the previous owner said at least.) It is grouling pretty bad when you take corners, it has done it for a long time, bout 8 months. I drained fluid, and replaced with Lucas Diff. Fluid, which they claimed is fine for posi's, and topped off with rearend fluid which also claimed on bottle, good for limited slips. Well, It seems like it got louder now, after bout 90 miles.

Any ideas, If not that expensive, what kinda money am i looking forward to spend to rebuild, or whats a good price to look forward to at a salvage yard.

Thanks

[wolfdogs]

drain the fluid, re install some mobil 1 gear oil at the specified weight, then get two bottles of the GM differential additive from you local dealer and install both bottles. most of these rears growl on corners if you dont use that gm additive.

[pennylessz28]

Odd, the guy I bought my car said I had 4.10s, wrong, my option code says 3.23s.

I hate people who just start adding stuff to make it sound more impressive than it is.

Good think the paint and interior were how they where.

[Injuneer]

You need to determine what is causing the noise. If its the gears, they need to be replaced. If its a bearing, might be relatively minor. How does the limited slip work? Does it lay down two black stripes or one when you break the tires loose?

[smokinstangs]

I dont want to butt in, but ,limited slip will lay down a right side black mark then stop, then a left side mark , and back and forth until the rear gains traction it sounds to me that some teeth are wore down in the axle a little (or alot)

[azkkn]

I dont want to butt in, but ,limited slip will lay down a right side black mark then stop, then a left side mark , and back and forth until the rear gains traction it sounds to me that some teeth are wore down in the axle a little (or alot)

if this is what yours does, then you need to replace it.

[DeWynter]

I dont want to butt in, but ,limited slip will lay down a right side black mark then stop, then a left side mark , and back and forth until the rear gains traction it sounds to me that some teeth are wore down in the axle a little (or alot)

Dude, you need to fix yours, I have have had several firechickens and a mustang, and has ever done that! Only thing they ever do is leave nice twin black stripes on the pavement

[smokinstangs]

you guys SURE you dont have locking Diffs????????

[bigtow]

I dont want to butt in, but ,limited slip will lay down a right side black mark then stop, then a left side mark , and back and forth until the rear gains traction it sounds to me that some teeth are wore down in the axle a little (or alot)

my formula has the standard L S D axle and it used to lay 11,s when i nailed it now i can only draw 1,s but a lsd should spin both wheels atthe same time

[Injuneer]

you guys SURE you dont have locking Diffs????????

The first Positraction limited slip differential I had came as one of only 3 options (AM radio, 300HP/327ci engine, Posi) on my brand new 1963 Impala. Subsequent units in my 1966 GTO 389 Tri-Power, 1968 Firbird 350, 1973 Gran Prix 455 HO, etc....... all the way up to my 94 Formula - you get the picture. And I never saw a posi work the way you described.

Currently running an Eaton HD (14-disk) posi, and it will lay down two very dark strips of rubber from the instant you hit the throttle, until you finally let up.

[bigtow]

quote"Currently running an Eaton HD (14-disk) posi, and it will lay down two very dark strips of rubber from the instant you hit the throttle, until you finally let up."
would one of thesefit my 93 formula i need somyhing tuff

[N20LT4Bird]

I am running an Eaton HD limited slip (posi) in my 12 bolt and it will light both tires at the same time for as long as i want. Thats what a limited slip does. The clutches in the diff keep both axles locked together until they meet enough resistance between the two axles, like when youre going around a corner. When turning, the two wheels want to spin at different rates, so the clutches will drag as the axles become disengaged from one another.

[Injuneer]

quote"Currently running an Eaton HD (14-disk) posi, and it will lay down two very dark strips of rubber from the instant you hit the throttle, until you finally let up."
would one of thesefit my 93 formula i need somyhing tuff

No.... won't fit in the stock 10-bolt rear. The one in the picture is from my Strange 12-bolt. Normally, you don't get that view of it, but Strange forgot to machine the ABS reluctor ring into the carrier on the assembled unit they shipped to me, so they had to send me a new carrier.

A posi that "grips" intermittently might be a sign of a failing clutch pack, or possibly a failure to use the GM "limited slip additive". In the "old days" (when Ken was a young lad.... ) GM recommended two different lubricants for the standard and "posi" rears. There used to be a metal tag under the fill plug that reminided you it was a limited slip and needed special lubricant. I guess they decided to use the same lube in all diff's, and then have the "LSD" additive for the posi's.

[bigtow]

which eaton part would i need for my car fred and are they bullit proof seeing as i killed my standerd posi in under 10k ?

[azkkn]

I dont want to butt in, but ,limited slip will lay down a right side black mark then stop, then a left side mark , and back and forth until the rear gains traction it sounds to me that some teeth are wore down in the axle a little (or alot)

this is exactly how all my ricer friends think an LSD works, only because there front wheel drives torque steer and as they correct when burning out, this is what happens.