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08-27-2014, 08:27 PM
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#1 |
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Registered User
Join Date: May 2012
Location: Pennsylvania
Posts: 132
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gearing and ratios
1985 chevy, 350 crate motor, carbed, 700r4 trans, 35 inch tires, axle gears 3.08s, transfer case is np 208, good or bad idea?
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1985  High Sierra step side 4x4
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08-27-2014, 08:29 PM
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#2 |
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Newbee
Join Date: Jan 2010
Location: Phoenix, Arizona
Posts: 1,406
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Re: gearing and ratios
Probably want to go 3.73 with the OD.
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08-27-2014, 10:53 PM
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#3 |
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Senior Member
 Join Date: Mar 2003
Location: Colfax-California
Posts: 8,602
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Re: gearing and ratios
35'' tires and a 700................4.56 gears
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08-27-2014, 11:46 PM
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#4 |
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Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,402
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Re: gearing and ratios
35" tire, I would also go 4.56 on the gear
 longhorn
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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08-28-2014, 12:03 AM
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#5 |
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60-66 Nut
 Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,251
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Re: gearing and ratios
I agree with a 4.56 gear with those 35" tires. The 3.08 gears with 35" tires would just be absurd.
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08-28-2014, 01:01 AM
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#6 | |
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Registered User
Join Date: May 2012
Location: Pennsylvania
Posts: 132
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Re: gearing and ratios
Quote:
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1985 High Sierra step side 4x4
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08-28-2014, 01:14 AM
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#7 |
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Registered User
Join Date: Oct 2009
Location: Great White North
Posts: 1,520
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Re: gearing and ratios
Check out this website. Great driveline / gear / tire calculator. Use the drop downs to input your tranny and transfer, then input your tires and change up the gearing till you get the rpms where you want them at specific speeds. Can also do a side by side comparison.
http://www.grimmjeeper.com/gears.html
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Jeff. '72 Blazer K5 "Camshaft opinions are like belly buttons; everyone has one and no two are alike" My Blazer Build: http://67-72chevytrucks.com/vboard/s...d.php?t=626752 My Engine Build: http://67-72chevytrucks.com/vboard/s...d.php?t=637336 |
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08-28-2014, 02:32 PM
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#8 |
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Registered User
Join Date: Oct 2009
Location: .
Posts: 2,187
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Re: gearing and ratios
I had 3.08 and 35 on my 85, I don't think it ever shifted into overdrive until 60+
Another option would be a 3/4 ton rear or swap to 1 tone axles, if you still have 2 10 bolts. |
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