Posi Vs. Truetrac
This is a discussion on Posi Vs. Truetrac within the Drivetrain forums, part of the LSx Technical Help Section category; So the time has come for a 12 bolt. I made one pass with the POS 10 bolt on drag ...
03-27-2013, 03:56 PM #1
- Join Date
- Jan 2010
- 00' z28-R.I.P 00' WS6 M6
Posi Vs. Truetrac
So the time has come for a 12 bolt. I made one pass with the POS 10 bolt on drag radials and heard a loud ass pop, so that was enough for me, last thing I want is to tow this thing home.
Due to the fact that I do DD the car a little, plan to use it on road racing courses, and use it on the strip I've decided I should stick with a LSD and stay away from a locker/spool unit.
So I have 2 questions. 1: should I go with a posi or truetrac? I know the basic structural difference between the two (Posi uses clutch packs. Truetrac uses worm gears). From what I understand the Truetrac is more reliable and can handle more torque, but since I'll be road racing I also need a unit that'll behave under tight cornering conditions, so in that regard, do the two units have any differences?
Question 2: are the 33 spline axles overkill? From what I understand, the formula to calculate torque rating for the axles is as follows: 1st gear ratio X Ring and Pinion Ratio X Peak Torque X .9 (drive line loss). From what I hear, the 30 spline is rated 6200 lb-ft. So if I eventually work my way up to 450 RWTQ (ambitious, I know), with 4.10s, i'll be at 4416 lb-ft. So I should be fine with the 30 spline right? I don't wanna overkill and lose power on the dyno due to going with the 33 spline if they aren't necessary. (I go to dyno events and such).M6, MS3 Cam, FAST 92/92, LS7 Clutch, Hurst Comp/Plus Shifter, Lid, K&N, OBX LT's, 3in ORX True Duals, KYB AGX shocks, BMR 3-Point SFCs, BMR springs, BMR Adj. PHR, LCA Relos, STB, 315 NT555Rs, DeepDish C5Z06s.
03-27-2013, 04:41 PM #2
Subscribed as I am very hard on my toys and will probably be down this road sooner than I hope.
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