3.42 Chevy rear-end gears

After some thought, I've decided on putting 3.42 gears in my [2-wheel drive] '86 Silverado... it has the 700R trans, a 305 ci, and soon; the 3.42. Does anyone have a similar set-up, and if so what are your "likes"
and "dislikes" of this combination? Thanks for any help and for your thoughts... GC
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You are REALLY gonna be lugging that engine! Your final ratio is gonna be in the area of 2.40...
| After some thought, I've decided on putting 3.42 gears in my [2-wheel | drive] '86 Silverado... it has the 700R trans, a 305 ci, and soon; the | 3.42. Does anyone have a similar set-up, and if so what are your "likes" | and "dislikes" of this combination? | Thanks for any help and for your thoughts... GC |
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Probably wants mileage....
~KJ/TLGM

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it's gonna be gutless..............with 'normal' tires, he's going to be between 1650 and 1800 RPM in 4th with TC locked
its BAD with a 5.7, but with a 305.................

"likes"
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wrote:

it's not that bad... my brother's '93 C1500 has that basic setup.. (4L60E, 305, 3.42) with his 235/75-15's it's not bad at all on the highway and he gets about 18mpg. of course, I could drop my 88 K2500 in 4 low and rip his frame in half, but that's for another day.
-Bret
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I have a 1999 K1500 with a 5.7 liter and automatic transmission. The gearing is factory 3:42 and has factory P265/75 R16 tires and have no problems with lugging the engine. The 5.7 liter has plenty of torque to pull that gear.
Brian

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The gear now in the truck is a 2.73... it's definitely doing some major lugging. With a 3.42, I'd have slightly more first gear torque than a TH350 with a 3.73 [typical combination in older Chevy PUs]... slightly less torque in second and third... and overdrive for highway mileage. A 3.73 would have more power in third, but would turn almost too much torque in first... a 3.73 with the 700R's first gear of 3.06 would be brutal on a little ole 305ci. Wadda ya think?
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That I have a 305, TH700R4, 3.73's, and can burn my 31's up.....
~KJ/TLGM

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