Hey guys, new to this site; been out of the Modular Mustang scene for a LONG time (military deployments and all). Getting back into the grind of things I recently decided to do a complete rear-end rebuild (after discovering fractured spider gears in the stock differential during its last fluid swap); its time to do this the way Ford should have if cost wasn't a factor in 1999. We are welding the axle tubes to the housing, wedling on end-flanges, welding a dual-plane cross brace kit from Wild Rides, Energy Suspension's upper housing bushings, dropping in a True-trac & Moser 35 spline axles, and now I just need to set the final drive gear ratio. I'm not a novice when it comes to how all this works (its just now its my time to undergo this actual upgrade), so am looking for some real bona-fide input from the experienced guys on this forum. I'm personally swaying on the Motive Performance 3:31 (so I can entertain doing a 1/2 mile airstrip attack some day too... yes I realize 1/4 mile & 1/2 mile are quite different). I want to maximize my time in the power band while in working gears (1st-4th), and as it is/was before my diff broke apart, 3:73 was just too steep. So here are some prime critical questions (SN-95 specific PLEASE):
* What final drive gear ratio would you recommend for a 2.1L KB blown setup?
* What are your experiences when it comes to gear ratios with Positive Displacement (PD) blower setups?
* What tire sizes are you running with your PD setups?
* What experiences do you have with Motive vs Motive Performance ring & pinions?
Factors:
* This build is NOT meant to be a daily driver; 100% street/strip BEAST. Comfort & MPG is NOT a factor.
* 473 rwhp / 447 rwtq (w/ current 3:73 gears); plans to build the bottom end and do the pulley swap are coming.
* Stock 5-speed (until this one explodes).
* FRPP Aluminum Driveshaft
* BBK Solid LCA & UCA
* Stock/Gabriel Quadri-shocks (yes I am still running them)
* QA1 12-Point Adjustable Shocks
* Eiback Sportline Springs
* Wild Rides Upper & Lower Battle Box Upgrades (installing this week)
* Nitto 555DRs our back (315/35-17); honestly thinking of switching to the M&H 325/35-17s (28" tire)...
* What final drive gear ratio would you recommend for a 2.1L KB blown setup?
* What are your experiences when it comes to gear ratios with Positive Displacement (PD) blower setups?
* What tire sizes are you running with your PD setups?
* What experiences do you have with Motive vs Motive Performance ring & pinions?
Factors:
* This build is NOT meant to be a daily driver; 100% street/strip BEAST. Comfort & MPG is NOT a factor.
* 473 rwhp / 447 rwtq (w/ current 3:73 gears); plans to build the bottom end and do the pulley swap are coming.
* Stock 5-speed (until this one explodes).
* FRPP Aluminum Driveshaft
* BBK Solid LCA & UCA
* Stock/Gabriel Quadri-shocks (yes I am still running them)
* QA1 12-Point Adjustable Shocks
* Eiback Sportline Springs
* Wild Rides Upper & Lower Battle Box Upgrades (installing this week)
* Nitto 555DRs our back (315/35-17); honestly thinking of switching to the M&H 325/35-17s (28" tire)...