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Running 4.56s, with 35"ers, and a 700r4 ** What about 37s?

you gatta watch out tho, with less gear (4.10's with bigger tires) it will want to kick out of overdrive when climbing hills or just trying to accelerate. i had that problem with 3.73s and 35's, it would hardly stay in overdrive. as i mentioned before, i would go with 4.88's, i think you'll be the happiest and you will still get decent gas milage because you wont have to step on the gas as much
 
I ran 33's with the stock 4;10's in my k10, 6.2, 700, 208. had more than enough power of the line and cruising the highway. I could light up the tires at stoplights no problem, and 4-Lo had plenty of control also. As for wanting to kick down out of overdrive, I could cruise through town at 30, then accelerate back to 50-60 no problem, never left O/D.
 
1986K10 said:
I ran 33's with the stock 4;10's in my k10, 6.2, 700, 208. had more than enough power of the line and cruising the highway. I could light up the tires at stoplights no problem, and 4-Lo had plenty of control also. As for wanting to kick down out of overdrive, I could cruise through town at 30, then accelerate back to 50-60 no problem, never left O/D.
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you also have a 6.2;) the rpm's are a little different with a 3400 redline or whatever it is:D
 
My truck is gonna be a healthly 406, with a 700 and 4.10s I plan on running around in 3rd till i get the money to go to 4.56s, or 4.88s. The axle I have is a welded rear end too, at that time im planin on goin to a detroit
 
muddybuddy said:
you also have a 6.2;) the rpm's are a little different with a 3400 redline or whatever it is:D
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I'm not too sure what the redline of an engine has to do with overall driveability, this was originally a 305 truck, p/o changed to the diesel but left everything else alone. And now i'm in the middle of putting a 350 in it. Redline will surely have an effect on top speed, but thats about it. The actuall rpm's at a given speed will be the same regardless.
:D
 
I think he means all your power is at lower rpm's. a diesel with 4.10 is a lot different beast then a gasser with 4.10's.
 
The 700's tend to overheat and fail anytime the engine is unable to keep the vehicle at speed in OD without shifting to D. The continuous locking and unlocking of the TC, as well as gear hunting can lead to premature failure. A stockish high mile TBI motor does not typically make enough power and torque to do this in many situations. Keeping the trans in D unless doing flat interstate type driving will help keep the trans from gear hunting.
 
4.56 will do ok in your situation with the 37s. If you go to 38 I would suggest 4.88. IMO 4.88 would be better with the 37s also. 39.5 or bigger and you start talking 5.13 or 5.38.
I have been running my 39.5 on 4.56 and I'm tired of it. Can't use overdrive and I am in 4 lo all the time, offroad. I am about to install some 5.38. It was a tough choice between 5.13 and 5.38, but I figure that I may go to 42s down the road, and don't want to regear for a 4th time.
 
Leper said:
4.56 will do ok in your situation with the 37s. If you go to 38 I would suggest 4.88. IMO 4.88 would be better with the 37s also. 39.5 or bigger and you start talking 5.13 or 5.38.
I have been running my 39.5 on 4.56 and I'm tired of it. Can't use overdrive and I am in 4 lo all the time, offroad. I am about to install some 5.38. It was a tough choice between 5.13 and 5.38, but I figure that I may go to 42s down the road, and don't want to regear for a 4th time.
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careful. if you have a 4.56 carrier for a 14 bolt then 5.13 are the highest number gear you can fit. they make 5.38 for a 4.10 carrier.
 
i had 5.13s with 39.5s and i loved it. if you are going to gow ith 37s is just go with 4.88s
 
4.56/35, then 4.10/33, now 4.56/37 :rolleyes:... what next :D? How about using one of them handy-dandy gearing calculators... and as several people have already pointed out in their reply, when in doubt, deeper gear is better, particularly so if not maxed out by tire size...
 
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