Putting in a light weight spool and taking out the tru trac. Just curious to what gains I might see at the tire and at the track.

 

Approximately 50# rotating mass..........maybe up to .03 ????

I will also recommend that you keep an eye on lugnut torque. They will come loose once in a while due to the back and forth twisting action of the axles.

 

I had a gear driven limited slip on my black street/turbo car.

I have a spool on my new car.

It isn't an apples to apples comparison at all, but the spool is noticeable in reverse with the wheels turned.

I couldn't give you an honest answer at the track aside from both tires spin when it doesn't hook!

 

Nothing lol... I did this swap last year and other then shedding some weight and insuring both tires are spinning, no noticable gains for me.

 

peace of mind knowing that it's not going to break.

 

If your tru trac is not slipping, you will see no difference. If you are wheelstanding the spool will keep the car straighter. Thats about it.

 

This is why I switched.

 

50lbs??? U sure about that?

 

I did the swap on mine, and saw no difference. I pulled it down to do a gear change, and found metal. The Detroit try trac was eating itself up, but not enough to make the car act up. I ordered a Moser steel spool. They advised against the aluminum one. Said the splines wear out faster. Witch makes sense.

 

Night and day difference. Simply because now you can make successful runs, and not BREAK THE TRU CRAP

 

I just put a tru crap in my 9" on the vette
I ran 1.3 60's all day on my 12 bolt posi-I figured how bad could it be?
Now I know-thx JL

 

more or less

 

I only notice mine now when I try and turn, especially in reverse. Make sure your rear tires are the same roll out or within 1/2" of each other. The M/T's I just got are just over 3/4 off and the car is wanting to pull, I'm trying to stretch the smaller one this weekend.

 

this sounds about right

 

I didnt think it would be much of a gain, but still help in the long run. I figured maybe .05ish and 5-10rwhp increase. Im really doing it to make sure the car stays straight and doesnt break.

 

Ive heard as much as 15+ rwhp.

 

Yea true trac is junk,spool and the peice of mind knowing it can handle abuse.

 

Tek, an old school eaton was a lot better then the tru junk.... At least those were rebuildable

 

Lol-well I'll see how far I can push it-great thing about 3rd members-few bolts and it's gone so if its really an issue for me I can always keep an additional 3rd member with a spool and swap it in for track days.

 

I was (stuck) running 11.1x 11.25ish for months, same setup for almost 2 years worked it down form mid/high11's. Truetrac was I think acting up. changed it out to a spool (same gears and tires) saved 33.8pounds, The diffs, diff lol weight (s60) And my stock 60K mile rear shocks for some used summit 3ways from a local. When 10.8x 1st past, a week later (just put the spool in I think was the day before) It was getting fall time and the air was better, but it was still during the daytime. But not was comparing 90* air 150 track temp, 2800+ DA in AUG daytime. to 50* oct night 500DA.
I was really hopping for just a 10.99 was shocked to see it running 10.8x. I remember too, on the street car car felt slower with the spool, And I normally dont trust how the car feels (as in this case) After pulling some gears I didn't have to steer the car as much, it wasn't as wild (fun?) it drove straighter. The big ET pickup makes since, the shortest distance between 2 points is a strait line I dont know if everyone will see a result like that, but thats really how it went for me