1979 GMC Jimmy 4×4 with a 350 need help with after market parts?

I have a 1979 GMC Jimmy 4×4 with a 350 i was wondering what should to to the engine to boost up HP and Torque I really want more power out of it because im getting a 6" lift and 37" tires and want more power to push them I know a new Carburator would make sense just not sure what kind or what else i could do. I would like to stick to replacement parts and bolt ons i dont want to have to pull the engine. I was also thinking about lower gears but im insure. all help and comments are appreciated
Im going to change the gears before i put the lift and tires on but i really want to feel more power out of the engine and boost the speed up so i can keep up with some of the cars on the road instead of having them fly by me
Changing the gears sounds like a must then that will be the first thing i do but i will still want to get more power out of it how else can do that

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2 Responses to 1979 GMC Jimmy 4×4 with a 350 need help with after market parts?

  1. abig84 August 5, 2010 at 9:50 am #

    yeah go with changing gears first and see if you need more power. my first k5 blazer had 35s and i later put on 38s the thing was so friggin slow. i come to find out it had 273 gears which is the worst gear you can possibly get. i found a set of 373 axles and put those under and the power about doubled.

    so if you got some 273, change to like a 411 or 456 and that will help a ton

  2. pickupman82 August 5, 2010 at 9:50 am #

    Lower gears will do more for you than trying to up the HP on the engine. To go from 31"s (usually stock for 4wd) to 37"s is a big increase and would kill your trans if you dont do a gear change. Here are a couple other forums more specific to 73-87 (91) body styles.

    http://www.67-72chevytrucks.com (one of the largest 73-87 Chevy/GMC truck/blazer/burb forums on the web)
    http://www.chevytalk.org
    http://www.73-87chevytrucks.com
    http://www.73-87.com