l98tpi

Synthetic lube and Conventional lube have the same lubrication properties. The difference in synthetic and conventional is the boiling point. Synthetic lube has a lot higher resistance to heat than conventional lubes which is why it will last so much longer before the lubricating characteristics begin to diminish.

rodj

It is generally recognised that there is a certain amount of wind up in the driveline, especially on stick cars. Even with the through bolts tightened to spec , you can get elongation of the holes in the beam due to movement .
The beam plates prevent / reduce this by giving the bolts a greater clamping area on the beam .
Worked for me

El T1

My '95 never did this until I replaced the auto tranny (a couple of weeks ago). Now the rear end scoots like a son of a bI%$ on hard-throttle 1-2 upshifts with ASR turned off. It also does it when I nail a big downshift (hit the meat of the power band).

It does the scoot to the extent that I'd be afraid of it in the rain (haven't driven in rain since the tranny swap).

I think that it is plausible that I damaged something or other during the job, but I can't think of what that might be.

Judging by what could have changed I'd eliminate tire size, tire inflation, rear-end lube, and maybe more of what people are throwing around out there on this thread.

BTW: I was amazed to find a post like this.

Iroc57

Yours sound more like traction as well

NEVRL8T

My '92 A4 does the same thing. Not as pronounced since I had a new tranny put in but it still does it enough that you can feel it. Usually when you're going above 40 MPH hour you can blip the throttle and the rear end wants to slide to the right some. Its not a traction issue.

Iroc57

Sounds like a common issue. I think that I will pay more attention, maybe it is worn bushings and I assume that it is traction

MK 82

My 96 LT4 does it too. BFG tires. You don't need to see it. You definitely feel it.

89FX3

... and I think Bill wouldn't mind me posting info that may be useful to others:

Hi Bart,

Something is likely allowing the rear thrust angle alignment of the wheels to deviate momentarily when applying power. The trailing arms and axle tie rod assembly would normally be my first point of focus when troubleshooting this problem. Since you have already addressed the trailing arms, it is more than likely that the tie rod assembly is causing/allowing this problem to occur. Be sure to remove the spare tire and spare tire holder if possible before bringing it back in tomorrow so that the alignment technician can get a better view of the tie rod inner link assembly for excessive play. This is likely where the problem will be.

I read through the thread on corvetteforum and wanted to mention to you that the use of mobil gear lube and additive is very good. The one gentleman addressing the tie rod condition (inner especially) I believe is spot on regarding the problem. As far as missing needle bearings in your new u-joints, I wouldn’t imagine that would be the case here.



Good luck with the search.

You can call me if you need quicker response on questions.

Best regards,

Bill Boudreau

ZR51 Performance

(602) 319-6575

NEVRL8T

I have BFG's also.

El T1

...sounds more logical than a lot of other theories.

I also notice that a lot of LT1 cars ('94-'96) seem to have this. That would lead me to believe in a common failure mode.

I've thought this through and came up with a theory:

1. I had no such problem EVER before I swapped my tranny.
2. Big problem after. IMO, can't be the tranny, as that only supplies rotation to the driveshaft--so what is it?

Well, my '95, being an LT1, has a bunch of exhaust system in the way of jacking up the rear end via the pumpkin. Because of that, I've jacked it up one side at a time in increments using the rear jack pads (just fwd of the rear tires) on the rocker panels. Screw that--takes forever.

Then I noticed that my jack fit under some suspension links/hardware, that hang down just to the driver's side of the differential. I jacked it up a couple of times using that. I probably bent something....

coupeguy2001

WEll, if you are talking about the rear of the entire car moving sideways while doing burnouts, my car does that all the time. When the rear breaks loose, and the road is sloped, the car tends to slide to the side of the road due to gravity.
Now if your limited slip rear is all worn out, and not positraction anymore, you will get a funny feeling when the slipping rear tire has suddenly found it's traction.
It sort of feels like the car jerks "back in line" with the direction of travel.
My 57 does it all the time (well, when I'm doin' burnouts) The 86 vette does that when in a turn.

l98tpi

I have a 91 auto and 6spd and never have had this problem unless hard on it and loose traction and even then the limited slip works excellent to compensate. Could this problem be limited to the Traction Control System on the 92 to 96 year model cars?

Hope you guys can find your problem. Good Luck.

widebodyzr-1

question for the OP and others experiencing this issue.

when you raise up the backend of your vehicle, does the wheel on the side that the vehicle is pulling to set higher than the other?

89FX3

That's a good question, except I've never jacked it up from the center, only from the side.

I will say that, when the car was up on the lift & they were replacing all of the suspension parts I listed earlier, I do recall the wheel/suspension seem to "droop" more on one side.

Don't know if that's because of what they were doing to one side at the time.

Now that it's back in for its 500 mile check up & dyno tuning, I'll ask them to note that.

Although it's doing substantially the same "scoot" it did before all of the suspension work noted earlier.

89FX3

...it was a worn inner toe rod.

My sincere thanks to c4cruiser, Vader & Bill Boudreau
for helping me focus on the likely problem area.

PLRX

I had that problem with my 95, it was aligned various times but it stopped once I lowered I noticed the right rear sat higher than the left rear. I lowered/right monospring and it sits leveled. The problem went away.

DougSilver

Congratulations for finding the problem. I wonder if it is reasonable to assume that a worn inner tie rod should be the first thing to check for others having this problem? Anyway, since the "scoot" seems to be fairly common, perhaps it would be a good idea to post this information as a sticky or in the C4 Tech Info section.

Doug

LT4-FUN

I also have a 96CE that "Scoots" as you put it. I have addressed this very same prob with a few friends that own shops and race quite a bit. They all say that these LT4s have quite the torqe factor and if you are burning a little rubber and then shift into second, you will get some sticky tires that grab tighter after they heat up. I know of five guys with LT4s that have the same problem also. I don't consider it a problem, but actually kinda fun! One more thing, one of the guys put 4:10s in and really scoots sideways like no tommorrow.

Iroc57

Thanks for updating

pearlvett

My '85 does the same thing and if going from hard go to a fast stop I get the same feeling.