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Discussion Starter #1
I have a 700 R4 and 35" tires. the GM 10 bolts are original gearing.

What would be the best gearing for it so that I can use my truck for the street and occasional off road. I was going to go with 4:56, but decided that would be too short, 4:11 where my next option, but other people have told me that will be too short as well.

I figured there has to be somebody on this board that has run the set up before and liked what they had. 3:73 have been suggested. would this still be too long?

thanks
wheeler
 

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i actually think you are going the wrong way. i would at least run the 4.56's; remember that your 700 has an overdrive, so when you are figuring your ratio and rpm's and such that has to be taken into consideration. www.4lo.com has a good chart to use. i was going to run 5.13's in my 10/12 combo with 36-38 size tires in my 88 k5 before i decided to go one tons, and i might still stick the 10/12 combo under it and save the one tons for a tube buggy.

there is some more thoughts here: http://coloradok5.com/forums/showthread.php?t=133292&highlight=overdrive+gears
 

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running same setup with 456 gears doing 2000 rpms in overdrive at 70 mph, just a hard shift on takeoff due to gears and low 1st in 700, 456 or 411 at least but no lower. jmo fightte
 

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S.A.K-5 said:
running same setup with 456 gears doing 2000 rpms in overdrive at 70 mph, just a hard shift on takeoff due to gears and low 1st in 700, 456 or 411 at least but no lower. jmo fightte

AGREE 456's should put you close to stock
 

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Were it me, I think I'd be looking at 4.56 to maintain street manners with good offroad ability.

Truthfully, were it me, I wouldn't be considering a street option (you can't build one rig that does both well), so I'd be hitting the lowest gears I could get.
 

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I am running 4.88's with my 35's and at about 65 MPH I am turning 2400 RPM, I wish I went with 5.13's since that would put my OD gear more in my 350 engine's power band.
 

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Discussion Starter #9
85mudblazin said:
I am running 4.88's with my 35's and at about 65 MPH I am turning 2400 RPM, I wish I went with 5.13's since that would put my OD gear more in my 350 engine's power band.
mmmm, yeah, I forgot to mention I have a 350TBI. for those of you throwing numbers out, I guess it doesn't matter of they are in a 10, 12, or 14 bolt huh?

anybody know the stock tire size for an 83 1/2 ton. 31s or 32s?

This truck doesn't see much dirt, but they way I see it, it does just fine now, so a little more usable power and torque to the wheels can't hurt. I don't think I will get stuck because of the gears...the tires won't have enough bite.
 

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wheelerjb said:
mmmm, yeah, I forgot to mention I have a 350TBI. for those of you throwing numbers out, I guess it doesn't matter of they are in a 10, 12, or 14 bolt huh?

anybody know the stock tire size for an 83 1/2 ton. 31s or 32s?
Only matters when your ordering.

Stock tire size is 235/75r15, roughly 29" tall.
 
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