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03-11-2007, 06:25 PM
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#1 |
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Registered User
Join Date: Mar 2007
Location: San Pedro River, SE Arizona
Posts: 734
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Need highway gearing
My 1970 C30 Flat Bed with 350 ci and NP 4 speed manual trans runs out great, but the rear gear ratio is high (probably 4:11) and the engine is turning about 3000 rpm at 60 mph. I need to get into a highway ratio and would rather not revise the rear end gears because sometimes I need the low for pulling.
Does anyone know of a good and relatively simple fix – a bolt-in overdrive or speed change unit (manual control is OK) or a 5 or 6 speed trans replacement? Simplest and strongest is best. All info and ideas will be appreciated. Paul
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CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp |
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