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4.56's and 33'

J

jtpepper

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4.56\'s and 33\'

I'm thinking about installing 4.56's in my axles to help it out,but I'm curious as to what the rpm's would be.I have a 700r4 in it with 3.42's and 33" bfg mud ta's.I normally cruise 65mph on my speedo wich is probably 70-75mph in reality and my rpm's are between 2050 to 2150.I'm planning on going to 35"-36" tires eventually when the money permits.Would it be driveable with the 33's on the highway or should I go with 4.10's?Any help and info would be greatly appreciated.Thanx and GOD Bless,jtpepper
 
Re: 4.56\'s and 33\'

I run 456's in my 84, with 35's 350 trans. good combo I run 60-65. you should be ok, especially with the 700r. /forums/images/graemlins/waytogo.gif
 
Re: 4.56\'s and 33\'

with the overdrive it will be fine /forums/images/graemlins/thumb.gif do you ever plan on going to a 38 or bigger tire? if yes do it right the first time and go with 4:88's /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif
 
Re: 4.56\'s and 33\'

You might want to slow down a tad before you get a speeding ticket. 2071 RPM with 3.42's, in overdrive, and a true 33 inch tire works out to 85 MPH. /forums/images/graemlins/eek.gif

At 70 MPH, with overdrive and 33's, the engine would be spinning around 2275 RPM. Get the 4.56's, you'll be glad you did, especially when you upgrade to the 35's. /forums/images/graemlins/thumb.gif
 
Re: 4.56\'s and 33\'

I run 4.56's and 35's with a 700R4. I used to run 32's with the same combo. It was great with teh 32's. I could climb any pass and cruise was pretty good with the OD. Now that I stepped up to the 35's I wish I had went to 4.88's or 5.13's. 4.56's and 35's isn't a bad combo, but I wish my cruise RPM was a little higher for the little extra power and the extra RPM when I kick down to climb a pass.

Definitly not 4.10's. Your transmission will hate you if you do. I consider 4.56's with 35's and 700R4 the minumum combo for that trans. Otherwise you are risking burning up the trans in OD because the RPM is too low for the torque converter to lock up.

I say if you are going to go with 35-36" tires then 4.88's. 37-38" 5.13's. I wish I had.

Harley
 
Re: 4.56\'s and 33\'

I had 4.10s and 35s and hated it with a 700R4. If I'd had the choice I would have had 4.88s with the 35s.

Go 4.56 or 4.88 with the 33s, you'll love it.
 
Re: 4.56\'s and 33\'

Thanx to all who've posted.It's been a big help.Are the rpm's listed on these calculaters compensating for auto tranny slippage,if not,around about how much more rpm's would I be turning?When I'm cruising down the highway,I do notice that I pass most everybody,but my Jimmy is cruising so nicely there/forums/images/graemlins/woot.gif.Thanx for the info,GOD Bless,jtpepper
 
Re: 4.56\'s and 33\'

I have 4.10's, 35's, and a th700 and have no problems with cooling. You can run this combo if you have a pretty torquey motor and I get decent mileage on the highway because of the higher ratio. I would go 4.88's if I were you. That is the ratio I'm switching to.
 
Re: 4.56\'s and 33\'

[ QUOTE ]
Are the rpm's listed on these calculaters compensating for auto tranny slippage,if not,around about how much more rpm's would I be turning?

[/ QUOTE ]
The 700R4 tranny has a lockup torque converter, so there is no slip at highway speeds. /forums/images/graemlins/cool.gif
 
Re: 4.56\'s and 33\'

i run 4.56 with 33's, and i love it....... don't try it if you don't have o/d though....... she just about tops out at 75...... i have no need to go that fast anyways.....
 
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