Rear-end/diff question
#1
Rear-end/diff question
Hi Everyone,
I have an '01 Expy with the 4.6L and am setting it up for better performance and eventually towing. It just got its first mod: Dynomax catback. Major improvement! Power delivery is much smoother, no loss of low end torque, picked up a few at the top end, and it sounds great!
Anyway, I have the 3.31 open rear and am looking to swap in a 3.73 LS. Just a few questions:
1) It should be an 8.8", right?
2) Should I go with a factory Trac-Lok or something else? I have no interest in an Auburn, since it's a throw away. Eaton or Powertrax. seem to be popular. Anyone have these units?
Thanks in advance for all of the input!
I have an '01 Expy with the 4.6L and am setting it up for better performance and eventually towing. It just got its first mod: Dynomax catback. Major improvement! Power delivery is much smoother, no loss of low end torque, picked up a few at the top end, and it sounds great!
Anyway, I have the 3.31 open rear and am looking to swap in a 3.73 LS. Just a few questions:
1) It should be an 8.8", right?
2) Should I go with a factory Trac-Lok or something else? I have no interest in an Auburn, since it's a throw away. Eaton or Powertrax. seem to be popular. Anyone have these units?
Thanks in advance for all of the input!
Last edited by bcbickers; 12-02-2002 at 11:37 AM.
#2
#3
I have a 5.4L, 4.10 gears with factory LS rear (9.75) and Eaton front LS. I had stock 3.55's. Before getting blown, I wished I'd gone to 4.30, even with a 5.4L. If you're going through the expense of a gear swap, I'd do the 4.10, especially with the 4.6L. This gearing hits the sweet spot of the power band, and does not noticably affect gas milage. You will, however need a chip to correct the speedo / odometer for the new gear ratio difference.
In my opinion the expy should have had 4.10 as an option.
But than thats only my .02c !
In my opinion the expy should have had 4.10 as an option.
But than thats only my .02c !
#4
#5