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4.56, 4.88, or 5.13?

Citizen Rider

Citizen Rider

1/2 ton status
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May 5, 2005
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Plano, Texas
What do you think? Everyone i wheel with runs 4.56 and does really well. This includes trucks on 42's, 39.5's, and 37's. My blazer is going to be down for a lil while as the transmission gave out for the 3rd or 4th time since its rebuild in feb. So while its down im going to throw a 14ff in the rear so i can stop worrying about that 10b.

I have a 350, TH350, NP203, and 38" TSL's. I still drive this on the road and gets me to where we wheel and back. I plan to go bigger tires far later in the blazers life, but right now 38's are perfect.

What would be best for offroad but still do alright onroad also?:confused:
 
4.88's is what I am planning to run. 4.88 would be a power gear for 35's, a good stock type gear for 36-37- and 38's and a milage geer for 39-42.
 
I smoked 4 trannies 1 year with 4.10s and 44 inch tires.Then I switched to 4.88s and 39s.This works very well and I could easily run 42s if I wanted to.
 
there is only one gear option in non-rockwelled rigs, and it is 5.13s. I paid good money to go 4.56 and have felt like an idiot for doing so ever since. lol!

j
 
jekbrown said:
there is only one gear option in non-rockwelled rigs, and it is 5.13s. I paid good money to go 4.56 and have felt like an idiot for doing so ever since. lol!

j
Click to expand...

really I love my 4.56's... next is overdrive.. (nv4500 someday...)I have yet to be underpowered.. well let me clarify....

if you are underpowered... gears only assist in a different area... tired motor or lack of hp could also result in needing steep gears....
that was my case... I was crankin 195hp/295lb ft torque... now im in the 300+hp range and dont know about torque... :bow:
 
4.88's with 36 inch Iroks (measure close to 37). It has great power and low range, but I wont drive it over 60 with the TH350 trans.
 
I run 39.50 with 4.56 and hate it! My stock tbi motor doesn't have the balls to push the truck in overdrive anyway. I need to run a BB454 or regear my stuff to 5.13. I am waiting now to decide if I want to bite the bullet and go rocks. If I were you, I would run the 5.13 , that way, later, when you go to 42s, your gears will be happy.
 
Here's a thought....

Toss out that POS TH350 and get a TH 400 or better, find a good used 4L80E!!!
I am in the planning stages of rebuilding my 80E with a lower first 2.75 instead of 2.48 and lower second gears (which you can get for the 400 also) and running 4.56 or 4.88 on 37's.
You'd stop the breakage altogether and with a lower R&P, save a few gallons to the mile.... I should know, I get 13 on the highway, but 9 in town..better than the 6 I got with my 79!!
 
Although the 400 is much stronger than a TH350, it does take more HP to spin. If you're running a mild 350 engine, the TH350 should survive. Plus they are cheap and easy to rebuild. Of course my confidence may be better than some, due to the fact that I have a good spare sitting around.
 
Leper said:
I run 39.50 with 4.56 and hate it! My stock tbi motor doesn't have the balls to push the truck in overdrive anyway. I need to run a BB454 or regear my stuff to 5.13. I am waiting now to decide if I want to bite the bullet and go rocks. If I were you, I would run the 5.13 , that way, later, when you go to 42s, your gears will be happy.
Click to expand...

I might go to 39.5 Iroks (in a year or two), but I don't want to regear from 4.88's. They're not even broke in yet.
 
I have overdrive and run 4.10 with 37s which is pretty much the same as 3.08s and 31s which sucks. When I regear it will be 5.13s:D . I plan on fodeetoos in the future:D .

Ira
 
I too am caught in this decision. I can either do 4.57 or 5.14 in the Eaton rear I have, because there is no 4.88 for it and also because I have both of those gearsets.

I figure that everyone who wheels wants to go bigger tires, so I might as well go 5.14 now and skip the 4.57. 5.13 gears for the D60 cost a tad more, but who cares.

I don't think it will be that bad, I calculate about 2500 rpm at 55 mph with 38's or thereabouts. Thats about what RPM i ran on the hwy before lift.
 
ive got 5.13s with 42's and i love them! if you are going to pay the money to regear, over compensate that way if you do go bigger, you will already be set instead of needing to regear again. also saves $$$$.
 
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