bravocharlie
Newbie
Unsure where to post this thread, my concern may be within the rear axle configuration. And so, I am asking for as much input on those who have had similar experience in correcting this. All input is appreciated.
A little about my jewel, I recently acquired a 1999 C1500 Suburban with a 5.7, 4l60e, 10 bolt fear end. 1 owner, 114k approximately. Owner claims to never had major repairs, only mods where a reusable drop in air filter, larger wheels/tires. Previous owner had installed 265/70r17, factory set up 235/75r15.
I'd like to install a less popular tire size, for cost reasons but with many benefits as well. A cooper discover s/t maxx, 255/80r17 (33"), skinner but taller tire with a 10ply-stiffer sidewall and higher load rating. Current tires are rotted.
So id be going from a factory 29" to a 33" tire.
I have not calculated mpg, haven't burned through a tank of fuel yet, she puts down about 42 gallons...
Burb feels underpowered, specifically getting up to highway speeds.
I did some math, and determined the most effective gear ratio I should be running is at about 3.91/1.
Ill share my math, (New Tire/original tire)original ratio=Required ratio. (840mm/734mm)x3.42=3.91.
Question is, what axle/final drive would you recommend? Posi/LSD would be preferred, but I understand they are limited. The rear suspension can use some additional support. On dirt roads, I can hear the leafs compress as the burb sways side to side. And I am not a fan of the rear sag, nor the inverted rear axle when compared to the front end. Ill post pictures shortly.
A little about my jewel, I recently acquired a 1999 C1500 Suburban with a 5.7, 4l60e, 10 bolt fear end. 1 owner, 114k approximately. Owner claims to never had major repairs, only mods where a reusable drop in air filter, larger wheels/tires. Previous owner had installed 265/70r17, factory set up 235/75r15.
I'd like to install a less popular tire size, for cost reasons but with many benefits as well. A cooper discover s/t maxx, 255/80r17 (33"), skinner but taller tire with a 10ply-stiffer sidewall and higher load rating. Current tires are rotted.
So id be going from a factory 29" to a 33" tire.
I have not calculated mpg, haven't burned through a tank of fuel yet, she puts down about 42 gallons...
Burb feels underpowered, specifically getting up to highway speeds.
I did some math, and determined the most effective gear ratio I should be running is at about 3.91/1.
Ill share my math, (New Tire/original tire)original ratio=Required ratio. (840mm/734mm)x3.42=3.91.
Question is, what axle/final drive would you recommend? Posi/LSD would be preferred, but I understand they are limited. The rear suspension can use some additional support. On dirt roads, I can hear the leafs compress as the burb sways side to side. And I am not a fan of the rear sag, nor the inverted rear axle when compared to the front end. Ill post pictures shortly.