Acetylene

I just purchased an 86 951. I do not have the option code for the LSD transmission, but the transmission has the upgraded cooler and it is obvious someone has been in there recently. When the car is on the lift and one rear tire is spun, the other follows in the same direction - the domestic equivalent would be called positraction, limited slip, etc depending on manufacture. The problem is the mechanic said the car could have "positraction" and not have the LSD trans. Is that so? He said the LSD was stronger than "just regular positraction that all turbos had". It will lay two "S" shaped black marks for as long as I want ...through the top of third gear and beyond. - sorry for the length

Eyal 951

find a new mechanic.

Posi and LSD (Limited Slip Differential) are the same thing, different names. The turbos either had it or didn't, nothing magical in between.

S shaped marks all the way through third? Let us know how that goes.

billthe3

Also, just fyi, all 86 turbos came with the tranny cooler - it became an option for the 87 and up years.

Aside from that, welcome to the site!

Oddjob

Absolutely incorrect; this guy is an idiot.

owner944

Keep laying rubber like that and you will buy a new clutch and probably a new trans.

Legoland951

Your mechanic is having a bad trip on LSD...

tinman944

welcome to the site.
and stop doing burn outs...

bleucamaro

Positraction is a GM "brand" name for their limited slip differentials. Its like me saying, "I'm going to go Xerox these documents," even though the copy machine is a Canon.

tinman944

LOL I like that.

pkt1213

Wow. I have moments of stupidity but I'm also not a mechanic.

tifosiman

Rrrockhound

Maybe the mechanic was referring to Torsen, which is not quite the same thing as a conventional LSD, right?

Oddjob

Well, then he would have said something like: "the car does not have the M220 option code, so it did not come from the factory with LSD - it came with a standard open diff. However, its possible that a previous owner either had a factory LSD unit installed in the transmission, or swapped in a complete LSD transmission, or it may have an aftermarket torque biasing differential installed, like a Quaife."

But instead he said: "the car could have "positraction" and not have the LSD trans.... the LSD is stronger than the regular positraction that all turbos had."

So that means he is an idiot (i.e. he is talking, but doesnt know what the f*ck he is talking about).

Mike B

Yup!

Acetylene

Thanks for welcoming me. That is exactly as I suspected. It made no sense to me, but he is a large European shop in Orlando - always a lot of 911's and such in the parking lot. Veteran racer/hot rodder, and turbo lover, but new to European cars. Principles are different even from my Grand National. As for the burnouts...why the he#@ do you think I bought the car - she begs to be driven!