Gearing and powerbands

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Originally Posted By: Srt20
.If your 3rd gear is 1:1, which I believe it is, you will turn 830 more rpm with 4.56 rear gears.
4.10 would be 370 more rpm in 3rd gear.

OD rpm depends on what your OD ratio is.
If OD is .7 then 3.73 to 4.56 would be about 580 more RPM.


Thats why, if i spend the money for a gear change, i don't want to spend say $1800 for 370 rpm. I 'd want a bit more bang for my buck.
 
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Originally Posted By: spasm3
Originally Posted By: Ramblejam
So, you want to tow in OD?


Not with this transmission. From what i've heard , towing in od in my model is bad for the trans .


You'll have to explain then why you're interested in 4.10's.
 
Originally Posted By: Ramblejam
Originally Posted By: spasm3
Originally Posted By: Ramblejam
So, you want to tow in OD?


Not with this transmission. From what i've heard , towing in od in my model is bad for the trans .


You'll have to explain then why you're interested in 4.10's.



The truck is heavy, and i want a more rpms as it struggles with inclines. Easier acceleration.

This post seems to imply that towing heavy loads in od is bad, midway down the page.

the post by casamagana
https://bobistheoilguy.com/forums/ubbthreads.php/topics/3928452/2
 
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4.56 (for your application) would be a poor choice.

Seemingly small jumps in gearing can make a big difference; solely moving from 3.73 to 4.10 (no other differences) was good for 2,000lb. gain in max trailer weight (per GM ratings) with the 6.0L in GMT-800 trucks.

Towing in OD with the 4L60 is fine. However, you must run with tow/haul engaged, ensure TCC slip isn't occurring, and monitor temps. Usually, 4L60 trucks are equipped with high(er) gearing, so people are lugging these things down the road, and never do any of the aforementioned. Inevitably, the thing goes boom...

4.10 would get you up to a RPM where pulling 4k in OD would be feasible (unlike the current 1950 RPM). However, if you're going to continue running in drive/1:1, the money would be better spent on improving it as a tow vehicle -- tuneup, monotube shocks, higher octane fuel (to keep it out of knock retard/exceeding knock retard), LT tires, hitch setup, OBD adapter/app, etc.
 
Thanks Ramblejam. the truck handles the trailer great (I equal-i-zer wd hitch. I have thought about a tuner, didn't know if its worth the money. what would you suggest.
 
I'd suggest first starting with a bluetooth/wi-fi OBD2 adapter and an app on your phone/tablet (Torque). This way, you can monitor what's actually going on with your truck (such as knock retard, TCC slip, transmission temperature), and get the most from it.
 
Originally Posted By: Ramblejam
I'd suggest first starting with a bluetooth/wi-fi OBD2 adapter and an app on your phone/tablet (Torque). This way, you can monitor what's actually going on with your truck (such as knock retard, TCC slip, transmission temperature), and get the most from it.


Thanks, i don't use a smart phone or a tablet, i do have a netbook thats about 5 years old. Is the software/app expensive? I hope you don't mind me asking but i have no idea where to find software like this.
 
I've done 4.56's in similar GM's before. Unless you are going oversize on the tires, I would recommend you think twice about it.

Gearing is not horsepower. It's not about getting bang for your buck. It's about getting it right. 3.73 to 4.10 may not sound like a lot, but wow what a difference it makes even in torque monsters like the Cummins Rams. Drive a 3.73 truck and a 4.10 truck back-to-back and tell me that it doesn't make that much of a difference, even when being fed by a torque beast engine.

With gears, there's no second chances.

4.10 is quite a favorable ratio for torquey gas engines. Love them in my Roadmaster and Caprice. Love them in my JGC. Love them in my Rams.

It is also pretty much the limit, unless you have 7000 usable rpm on the tach.
 
my tundra has the factory tow package which goes from 3.7 to 4.1. Our camper is about 4400 loaded. it's a good combination. I do not tow in OD, but on flats at 60 mph is can hold 5th gear, but I've noted in the past higher internal ATF temps when pulling in OD so I don't do it. 4.1 around town gives it a lot of juice on tap coming off the line gives me a little better control of maximizing wet traction before the wheels start to spin, especially like pulling out in a turn. The last vehicle I towed with was a jeep with 3.73's. granted, totally different vehicle and trans, but the towing feel for me with this vehicle and 4.1 is spot on, very nice.

-m
 
Thanks for all the suggestions! Sounds like everyone with experience is saying 4.56:1 is too much! If i can find a set of diffs from a wreck with 4.10 it might be less expensive than paying to change the gears in each end ( 4x4 ). But by changing the gears in mine, at least i know whats there!
 
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