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3.73's or 4.10's

steve_kibbe

steve_kibbe

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I'm going to put a 14bsf in my 88 K5 daily driver.

I run no lift, other than a 1" zero rate in the back, 350 tbi with a 700r4...33's at for the street and 33" tsl's on the trail.

I do a good bit of towing, either a flat trailer with landscape blocks to tractors and a 12' dump trailer with construction dibre and gravel.

Future plans for my blazer include a slow build, but keeping the 33's for a while with no lift.

What gears would work better 3.73's or 4.10's.

Btw, I'm wanting to keep the 6 lug for now, thats why I'm not going 14bff.
 
Well, since you`re going to be towing a good amount of weight and often, the 4.10`s wont hurt, but i think 3.73s could get the job done as well.....so i would just go with the 4.10`s, seeing as your also running 33s
 
I run both in two different vehicles. If you're going to be doing quite a bit of towing, I'd stick with the 4.10 gears. If you'll be doing mainly highway driving with just occasional towing, I'd go with the 3.73 gears.
 
I have thought about 4.56's, but I don't know if thats too much.
I'll have to play with the ratio calculator some more.
 
i think the 4.56`s will be over kill....i pulled a 6x10 trailer with my blazer when i first got my license, i was helping out a friend who was getting his eagle scout, so we pulled a bunch of fire wood up to a shelter that had a giant fireplace that did very well to heat the place in the winter, pull it up i would say a 30 degree incline for a good 1/2 mile, and she had no problem, and thats with 3.73s and 33s, i think 4.10s would`ve been ideal...
 
steve_kibbe said:
I have thought about 4.56's, but I don't know if thats too much.
I'll have to play with the ratio calculator some more.
Click to expand...

Not too sure about 4.56, 700r4, and 33" tires on the highway. I have 4.56 with 35" tires in my CUCV and it still screams at 65 MPH, but I don't have overdrive. I would guess that the 4.10 would be the best of both worlds. That rpm calculator can be your best friend for this type of decision.
 
I tow a 28 ft. travel trailer w/ my '90 K5 w/ 33's and 3.73's. I've thought about going w/ 4.10's, but the 3.73's seem to do ok and I am afraid of what 4.10's would do to my mileage. I have not ruled it out but I don't want to get minimal pulling power while burning alot more gas. I don't know that that would be the case, that's just my fear.
 
For those of you who have been around long enough to remember Zakk, I know what he'd say at a time like this:

"5.13s are the answer to all questions....."

zakk.jpg



:D
 
Another vote for 4.10.
The extra power is ideal for towing, it will reduce the load on your poor little 700R4 and the overdrive will take care of hwy rpm isses.
 
First of all, there really isn't a huge difference between 3.73 and 4.10. With that said I really don't think that 4.10's would make a huge difference in gas consumption then 3.73 would.....I would guess you would have a small amount of extra pulling power and use a very small amount of extra gas. It's not like going to 4.10's would lose you 3 mpg or anything.

4.56's would not be bad either. Keep in mind that the 700r4 has a 0.70:1 overdrive ratio, so 4.56 gears would be the same as 3.20 gears in a truck without OD.
 
After having pulled 33's with 3.08's , then pulling 33's with 3.73's . They worked , and I advocated them .

But after going to 35's they kinda left me wanting more gear .

I went 4.56 just recently , and you can't pay me enough to ever go back . And seeing what my tach reads , I COULD HAVE went 4.56 when I had the 33's <---------- :thumb:
 
I recently pulled a 2 door 67 plymouth fury III on a 2000lb trailer with my Jimmy. I have 4.10s and 35's it was fine on flat level ground in 3rd gear but hills were definately a chore. I say go with the 4.10's for sure. If your in a really hilly area think about 4.56's.
 
i used to run 35s with 3.73s and 700r4 and i thought it had good power, but i wasnt towing. what tranny does it have? if its 700r4 id definitely get 4.10's or maybe even 4.56s. originally i was planning on 5.13s and 35's until the go bigger bug hit me. with the overdrive, 4.56s would be sweet!
 
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