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post #1 of (permalink) Old 07-18-2012, 10:56 AM Thread Starter
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1985 Chevy Suburban Questions.

I stumbled on this forum while trying to find out some helpful advice to my new project. I have been building a 1985 Chevy Suburban, it is a half ton that originally came with a 350. The 350 is long gone now, replaced by a 454, it still has the 700R4 tranny and the stock gears. I beleive the gears are 3:08 or 3:09, what ever they are they are super high and are on the to go list. I have recently put a set of 33's on it which makes the gears even taller, its a good thing it has the big block, else it would be a total turd. LOL. Any advice as to what gear ratio I would need to run 35, or 36" tires? Also what size carb should I be running on the 454, it has a Quadrajet on it now, I plan on buying either a Holley or Eldebrock this friday, I was thinking it probably needs a 750cfm, but again I am open to sugesstions. Another question for some of you gearheads, what would be a good cam that will produce alot of torque and has a nice lopey sound to it? Intake suggestions would be nice too. I live in the mountains here in Idaho so I want alot of torque, pulling power but I also want it to run strong on the highway also.
Thanks, Frank.
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post #2 of (permalink) Old 07-20-2012, 05:49 PM
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I went with 4.10s in my Suburban (it has a 350, 700 trans and 35" tires). I really wish I had gone with 4.56s instead. The truck is just so heavy, I think that little bit would make a world of difference.

As for the carb, I'm not an expert by any means, but I'm thinking 750 - 800cfm should be good for what you want. I don't know about the cam at all.
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post #3 of (permalink) Old 07-21-2012, 11:10 AM
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Thanks to Uncle Google...

Gear ratio formula: rpm = mph x gear ratio x 336 / tire diameter

Carb size: http://www.buicks.net/shop/reference/carb_cfm.htm

Last edited by stump runner; 07-21-2012 at 11:13 AM. Reason: link missing
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post #4 of (permalink) Old 11-05-2012, 08:28 PM
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from what ive seen on forumns and in real is people like to run big carbs its cool to have a 800cfm carb and so on. but from experince ive found carbs comparable to stock work very well on stock type motors like your exsplaining.


lots of suburbans and trucks came with a 14ff and 10bolt front with 410s. it might be cheaper to get the axles and swap then as compared to buying a ring an pinion along with the bloody knuckles tools and know how that youl need to do a gear swap.

i went this route and have a 14ff rear and 10 bolt front waiting to go in my blazer. 4.10s are plenty low and i run a sm465 tranny in granny low the thing barely crawls. ive also welded the spiders gears together in the current 10 bolt rear thats in it and plan to weld the 14ff.

good luck with your build.

89 ifs-sfa truck tranplanted in a 83 K-5 blazer offroad only rig
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