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09-01-2010, 08:26 PM | #1 |
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Join Date: Nov 2008
Location: lebanon Pa
Posts: 72
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gearing opinions
hey guys I am trying to get parts together for my swap. Heres what i have 6.0,4l80,and a rear out of a 96 impala ss. It has 308 gears stock, but i have 305/40/22 tires and thought a lower gear may be nice. I'm not drag racing just crusing and some towing use. thanx in advance.
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09-01-2010, 09:19 PM | #2 |
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Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,948
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Re: gearing opinions
You definately need more gear. I wouldnt run anything smaller than a 3.42. Those tires are almost 32 inches tall. I would personally use a 3.73 and possibly a 4.10 if it wasnt being driven much.
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09-02-2010, 12:55 AM | #3 |
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Join Date: Nov 2007
Location: Bay Area, Ca
Posts: 2,841
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Re: gearing opinions
I drive a 30" tire with 4.56's on the street on a regular basis. The lock up verter helps a ton with my loose 4,500 stall. A stock stall would show a smaller drop in RPM by engaging the lock up. I see 2,475 rpm at 65mph. Remember, the 80E's has a tall first. A steeper rear gear makes things nice.
My wife's trailblazer SS has a factory 4.10 gear and a 29" tire from the factory. It cruises at 2,300 at 65mph. I use the wifes TBSS to tow the race truck to the track (3600lbs + 1500lbs = 5100lbs + gear) If I was rocking a 31.5" tire (which is what a 305/40/22 comes out to) I'd probably opt for a 4.30.. This would put you at 2,250 rpm. Or a 4.56 would put you at 2,375. Your not really going to loose a ton of mileage as your still keeping the motor in a very efficient range. If anything, you might actually pick up a little since your putting such a tall tire on it with such a tall gear and no longer lugging it. BTW, a 3.08 with the tire you want to run would put you at 1,600 rpm..
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------Motor---------------Bottle 60'---1.53---------------1.41 1/8---6.58 @ 105.92----5.87 @ 118.41 1/4---10.38 @ 126.97----9.24 @ 142.49 Last edited by Super73; 09-02-2010 at 02:11 AM. |
09-02-2010, 01:38 AM | #4 |
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Join Date: Aug 2002
Location: Valley Center KS
Posts: 3,524
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Re: gearing opinions
My 05 silverado had ~32" tires on it with 3.42. I used it to tow my ~6500lb camper with. It definatly would have been better to have 3.73s
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09-02-2010, 10:55 AM | #5 |
Registered User
Join Date: Nov 2008
Location: lebanon Pa
Posts: 72
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Re: gearing opinions
wow 1600 haha. I was thinking a .373 but wasnt sure that was enough
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