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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: 1986_CHEVY_454 on May 12, 2012, 04:09:30 pm

Title: Rear end gear change
Post by: 1986_CHEVY_454 on May 12, 2012, 04:09:30 pm: I have a 1986 c30 with a 454 and i believe that it has a 4.10 ratio in the rear end. Ive been told that if i change that i will get better gas mileage and it will be a little faster. Just wondering what gear ratio i should change to. i don't tow anything with this vehicle it just drive it on the weekends mostly.
Title: Re: Rear end gear change
Post by: VileZambonie on May 12, 2012, 04:12:07 pm: What are you looking for? Better highway mileage? If you're looking for better around town mileage you're thinking backwards.
Title: Re: Rear end gear change
Post by: 1986_CHEVY_454 on May 12, 2012, 04:14:53 pm: Im thinking more highway, i dont travel through the city to often. and im really looking to pick up some speed to. ive seen stuff about i think it was 3.21 ratio but i could be wrong.
Title: Re: Rear end gear change
Post by: VileZambonie on May 12, 2012, 04:21:34 pm: What trans do you have?
Title: Re: Rear end gear change
Post by: 1986_CHEVY_454 on May 12, 2012, 04:24:37 pm: its 3 speed 400. im trying to get some speed to make it a nice street or strip truck. and gas mileage would be great too. hopefully something better then 8 mpg
Title: Re: Rear end gear change
Post by: VileZambonie on May 12, 2012, 04:27:13 pm: 4L80E is the only way you would really improve both performance and economy. I would be against changing the final drive ratio
Title: Re: Rear end gear change
Post by: 1986_CHEVY_454 on May 12, 2012, 04:28:53 pm: alright thank you. but do you have any suggestions on what gears would help the performace, instead of towing.
Title: Re: Rear end gear change
Post by: VileZambonie on May 12, 2012, 04:30:45 pm: You have the perfect performance ratio already. Going the other way is going to turn your truck into a slug.
Title: Re: Rear end gear change
Post by: 1986_CHEVY_454 on May 12, 2012, 04:33:06 pm: Oh thats good to hear. I guess that sves money for new carb and intake manifold. And Thanks for the help!!