axle gearing

[BAD HABIT]

Not sure where i should post this,but here goes.I have an 89 12v short bed 4x4 on 17-40 ground hawgs it has no mods as of now,but have plans on i/c,upgraded turbo,stage 2 fuel pin,gov spring,and maybe injectors,and a billet convertor.I have 4.10s in the front and was gonna chance the rear to 4.10s also,but befor i do that i want to know if 4.10s will be low enough with the 40s?I will be driving it around town but i will also be using it to tow a bumper pull,or small goose neck trailer with extender cab ranger on 2.5 tons.WHAT GEARS SHOULD I GO WITH??? Thank u in advance.

[Hansen01]

tow smart and it will work.(depending on what turbo you get) i have a 90 with an intercooler from a 97 and i find it hard to tow much anything over 14000lbs (truck trailer) with the pump turned all the way up, recently towed 24000lbs fuel screw backed out from runaway about 1,1/2 to 2 turns and could still get in upwards of 1300-1400 degrees if i wanted to get up to speed fairly quick
also truck has 4:11 in it, only couple hundred rpms diference

[ahale2772]

you dont have 4.10's front and back? ...be carefull with that

I might think of anintercooler for your 89 it would cool down your towing temps and you can keep the 4.10's

[BAD HABIT]

you dont have 4.10's front and back? ...be carefull with that

I might think of anintercooler for your 89 it would cool down your towing temps and you can keep the 4.10's

it will have matching gears,im still putting the truck together,i know 4wds i just dont know turbodiesels,i know turbos make a big difference,but not sure about 4.10s or 4.56s since i have a 3 speed tranny.

[dazedandconfused]

Well 4.10's running a 727 and 40" tires should run 2365RPM's at 65. A truck running 3.55's and a 727 should cruise at 2582RPM on stock 235's. I think you will be ok.

[BAD HABIT]

Well 4.10's running a 727 and 40" tires should run 2365RPM's at 65. A truck running 3.55's and a 727 should cruise at 2582RPM on stock 235's. I think you will be ok.

thank u that gives me some actual numbers to work with

[dazedandconfused]

No problem. I'll link a couple sites that I use to figure that stuff.
http://www.grimmjeeper.com/gears.html
http://www.4lo.com/calc/gearratio.htm