Hey all, sorry for the hiatus, been working on some truck issues. So, after a new tranny, new driveshaft (u joints with grease fittings ) I've decided to try and help my transmission out a bit and gear my 01 1500 4x4 lower. It's got 3.55s in it, id like to know what all I need to acquire to put 4.10s in it. Also, about what RPMs will a cruising speed be? Any negative side effects? (Gas mileage is not a negative side effect for me, because the truck already gets 10 at most due to 6 inch suspension lift and 35s)

EDIT: I'm asking about cruising speed RPMs because someone told me they would be about 3250-3750 with 4.10s)
Also, would an even lower gear be better? Perhaps 4.56s?

 

How do you use your truck?

More city or more hwy?
Do you tow?
What are your hwy speeds limits?

 

Here's a chart for you.
http://www.ringpinion.com/calculators/calc_rpm.aspx

The o/d in the trans is .69- this chart has .7 which will be pretty close. With 4.10's @ 60 mph with o/d you'd be @ 1650 rpm; with 4.56's 1840 rpm. Turn o/d off @ 60 it would roughly be 2700 rpm with 4.56's, 2400 with 4.10's. Probably a little lower due to the t/c locking up. Personally I like a lot of gear especially with an o/d so I'd probably go 4.56's .

 

Yea be prepared to either buy a tool or make it for the side adjusters ! I am gonna make one ! And i can't get the center pin out so i think i am gonna buy another rearend and put the 4.56s in it !

 

Silver, I was looking at Randy's, and I believe I found what I need for the rear diff, but I can't find the 4.56s for the front Dana 44.

 

& I use my truck on highways, no towing, some mild mudding.

 

What matches 35s? 4.56? It'd be like stock

I think 33s are 4.10s

 

http://www.ringpinion.com/DiffWizard.aspx

I found them on there. I might even consider 4.88's if you ever might go a little taller. With 35's you're looking at right around 2000 rpm @ 60 in o/d.

 

in the frt i think you need thick cut 4.56 to fit the d44. in the back the 4.56 need some coaxing to get it in there. 4.88s will they fit a corporate 9 1/4? and they may need to be thick cut as well.
just something to consider/ the thicker gears are usually noisier/ whine.

 

I have 3.90 gears and 33s and run 1800 at 60 in OD and a shade over 2000 at 70 in OD if that's any help.