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10-27-2016, 09:52 AM
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#1 |
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Registered User
Join Date: Nov 2001
Location: Springfield, MO
Posts: 2,939
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WTB rear gears
Hello all, I may be better off just purchasing new but it seems the original OEM stuff is generally better but am open to opinions.
I am looking to do a gear swap. Mine is a 12 bolt truck so I think my options are limited to either a 3.08 or 3.42. I think ideally a 3.23 (or similar) would be great but I don't believe they are available. I figure there is a ton of the 3.08 around I want to try a good set to see what I think. I am 5.3 turbocharged with a 4l80e. Thanks Dave
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Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!" |
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10-27-2016, 12:00 PM
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#2 |
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Registered User
Join Date: Oct 2013
Location: Alabama
Posts: 1,234
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Re: WTB rear gears
I've got a set of NOS GM 3.73 gears that I'd be willing to part with. PM if interested.
P.S. 3.42 was never offered in the GM truck 12 bolt. 3.08 - 3.73 - 4.11 |
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10-27-2016, 12:01 PM
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#3 |
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Registered User
Join Date: Oct 2013
Location: Alabama
Posts: 1,234
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Re: WTB rear gears
P.S. I'm running 3.73 gears behind a supercharged 5.3 & 4L80E and with a 30" tall tire it's just about perfect for low end grunt in gears 1-2 and highway cruising once OD kicks in.
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10-27-2016, 12:31 PM
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#4 |
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Registered User
Join Date: Nov 2001
Location: Springfield, MO
Posts: 2,939
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Re: WTB rear gears
Thanks Willie, first off I currently have set of 3.73 (aftermarket) and have a set of 4.11 installed and that proved to be just too low (numerically high) and was afraid going to 3.73 would be too small of a jump. I like to drive this on the highway and my last trip was a little tough running at speed for 1300 miles with the current gearing. It was setup when I had the double overdrive of the T56.
I believe I had found a set of aftermarket 3.42 made to fit but had not confirmed. I didn't think any was offered by GM but was not sure. on to you second post, it sounds like you are happy with the 3.73 gearing. My tires are about 3/4 inch shorter than yours so they are very close. My turbo is not very big so it is on the verge of boost when I am running down the highway. I dont know how different the supercharging is over the turbo setup. I have just heard and read the turbos like the added load produced by the higher gearing. I know currently I can blow thru the first 2 gears really quick with the 4.11. Thanks Dave
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Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!" |
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11-01-2016, 06:47 PM
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#5 |
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Active Member
 Join Date: Feb 2012
Location: Ilion, NY
Posts: 130
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Re: WTB rear gears
I have a nice set of 3.08 gears, if you are still looking. I can do $75 shipped. wayne
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11-01-2016, 08:38 PM
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#6 |
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Registered User
Join Date: Nov 2001
Location: Springfield, MO
Posts: 2,939
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Re: WTB rear gears
Thanks Wayne I just went and checked and unfortunately I purchased the carrier for my factory 3.73 sooooo I can't use the higher (lower numerical) than the 3.73. I need to regroup and decide what I want to do
__________________
Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!" |
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