35" tires on 3.55 gears
12-02-2013, 11:25 PM
#11
Don't have a link, but the guys at high country 4x4 in Denver did it. I was shocked when they said they could do it because I had called 3 other drivetrain shops in Denver and they all said the diameter of something is too large and no one makes new 4.56 gears for the newer rear end. It was $500 per axle for install and off the top of my head the gears were ~1200 for the install kit (over twice the cost of my buddies 4.56s for his Chevy). I have the box the gears came in sitting in the garage. I will run down and grab a picture of the part number for you after MNF.
Last edited by rkaminky; 12-03-2013 at 12:32 AM.
12-02-2013, 11:30 PM
#12
Senior Member
Don't have a link. From what the High Country 4x4 guys here in Denver said, G2 just started machining the shafts on these to fit the newer 9.75" Ford rear end. I was shocked when they said they could do it because I had called 3 other drivetrain shops in Denver and they all said the diameter of the shaft is too large and no one makes new 4.56 gears for the 9.75" rear end. It was $500 per axle for install and off the top of my head the gears were ~1200 for the install kit (over twice the cost of my buddies 4.56s for his Chevy). I have the box the gears came in sitting in the garage. I will run down and grab a picture of the part number for you after MNF.
12-03-2013, 12:51 AM
#16
12-03-2013, 01:02 AM
#17
Inebriated 4 ur safety
For an EB, 4.56 would be overkill. It may be good for a 5.0L with 35s though. The 35 inch tires will essentially turn your 3.55 ratio into 3.25. To get it back to the 3.55 performance, you would need a 3.88 minimum. But like I said, I don't think it is needed for an EB and a tune would do the job of getting that pep back.
Edit: Actually after doing a little number crunching. Based on the torque output of both engines at different engine speeds, a 3.55 EB would put out slightly more torque to the wheels then a 4.56 geared 5.0L from 1,400 rpm to around 2,700 rpm which is normal driving rpms. So yes, 4.56 on an EB would be overkill, but would probably be good for a 5.0L.
Edit: Actually after doing a little number crunching. Based on the torque output of both engines at different engine speeds, a 3.55 EB would put out slightly more torque to the wheels then a 4.56 geared 5.0L from 1,400 rpm to around 2,700 rpm which is normal driving rpms. So yes, 4.56 on an EB would be overkill, but would probably be good for a 5.0L.
Last edited by Al Kohalic; 12-03-2013 at 01:48 AM.
12-03-2013, 02:11 AM
#18
Senior Member
I have 2012 Screw, 5.0, 3:55, 145", 3" Pro CompLevel & 2.5" rear blocks
I went to BFG Rugged Terrian T/A LT 275/65/20=34.1"
from the stock Pirelli's 275/55/20 31.9"
Don't forget - Tire and rim weight makes a big difference, and from the stock Pirelli's to the BFG's was only 5lb difference for each tire, you can check Tire Rack.com for the facts.
I had lagging and seemed slow off the line but it was my trans, plus I added the K&N 63 Kit and seemed to change the shift points no lagging
It went in for the updated TSB's for the PCM Higher Calibration for the 2012 & 2013 it changed that trans so much it was like driving a different truck
it bolts off the line and just keeps climbing feels like a muscle car how it shifts and climbs through the gears , and way smoother and seems real quick. Feels almost like I 'am driving my Supercharged GTP Grand Prix
Just sayin
Grant
I went to BFG Rugged Terrian T/A LT 275/65/20=34.1"
from the stock Pirelli's 275/55/20 31.9"
Don't forget - Tire and rim weight makes a big difference, and from the stock Pirelli's to the BFG's was only 5lb difference for each tire, you can check Tire Rack.com for the facts.
I had lagging and seemed slow off the line but it was my trans, plus I added the K&N 63 Kit and seemed to change the shift points no lagging
It went in for the updated TSB's for the PCM Higher Calibration for the 2012 & 2013 it changed that trans so much it was like driving a different truck
it bolts off the line and just keeps climbing feels like a muscle car how it shifts and climbs through the gears , and way smoother and seems real quick. Feels almost like I 'am driving my Supercharged GTP Grand Prix
Just sayin
Grant
