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Old 09-05-2001, 12:38 AM   #1 (permalink)
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Thumbs up How High?

Just wanted to know how high I need to lift my 88 K5 in order to fit 40" Boggers. I have a 4 speed in it and was also wondering what kind of gears I should put in the axles. Yes, they are going to be 3/4 ton axles. It will be driven a lot on the street so I don't want the gears to be to low. Thanks for any info. <IMG SRC="smilies/beer.gif" border="0">
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Old 09-05-2001, 10:31 AM   #2 (permalink)
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I'd suggest 4.56 to 5.13 depending on what rpms you want to be turning at what speed. Go to for those calculations...

As for lift, anywhere between 3" and 10" depending on how much you wannt to cut and where you want your center of gravity to be. Go to and ask some of the K5 boys over there. Also look at the blazer of the month on the opening page for a look at 3" lift and 39.5 TSLs.
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Old 09-05-2001, 01:15 PM   #3 (permalink)
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Tex has some good points do a search here and you will find others. I had a 88 k5 that had 4 inch lift and 33's but when tucked they would rub in the front it needed some trimming. My friends suburban runs 38s with 3 body and 6 suspension ( tow rig ) so I would guess 8 sus. 3 body will get your 40's but no real flex there.
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Old 09-05-2001, 11:49 PM   #4 (permalink)
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All a matter of how carried away you want to get with the sawzall <IMG SRC="smilies/biggrin.gif" border="0">
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Old 09-06-2001, 07:02 AM   #5 (permalink)
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With my K5 I had a 6" suspension lift , a 3" body lift and a bit of fender trimming. Angles were pretty good.

I also have an sm465 with only 4;10 gears but have a big block. I'd go lower gears if you can. Also depends on what kind of wheeling you plan on doing.
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Old 09-07-2001, 12:32 PM   #6 (permalink)
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Go with 8" Skyjackers and a 2 or 3" body lift
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Old 09-10-2001, 02:30 PM   #7 (permalink)
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I run a 6" suspension and a 3" body lift on my Blazer and clear 38 Swampers, no problem. How they would be twisted up I dont know I am more into mud. I plan to go up 2 more inches and going to 39 Boggers next. The extra height is mostly for the added width of the Boggers, and just for 2 more inches! <IMG SRC="smilies/biggrin.gif" border="0"> So IMO a 10-12 inch w/ no body lift, or an 8 inch w/ a 3inch body lift, will do you fine.
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Old 09-20-2001, 08:10 PM   #8 (permalink)
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<IMG SRC="smilies/usa.gif" border="0"> I have a 4inch lift and i have 36" Gummbo's But my fenders are cut quite a bit and i still hit on the back of the fender where the cab starts i'm curios about the shackle flip that will give me 4 more i need info on how to do it though <IMG SRC="smilies/usa.gif" border="0">
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Old 09-21-2001, 11:57 AM   #9 (permalink)
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Lift? Who needs lift? I've got a sawzall. heheh.

Lift is really a matter of personal preference and your willingness, or lack there of, to hack sheet metal.
Although if you do too little lift you may have problems with rubbing on the firewall.
As for gears, I would do 4.56 or 4.88 for a lot of street driving on 40's.

I currently have 37's with about 6" or 7" and a little hacking and 4.88 gears. Nothing's going to change when I get 40's except more hacking. And if the tires rub the firewall, I will move the axle forward an inch and a half.

I can't really tell you what should do since a lot of it is personal preference, I can tell some things you should not do but it does not sound like you were going to do anything bad. Hope I helped a little. Or atleast I hope I did not make it worse. heheh <IMG SRC="smilies/smile.gif" border="0">
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Old 09-26-2001, 08:56 PM   #10 (permalink)
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For gaer ratio, first decide what RPM you want to run @ what speed & calculate from there. For example, say your 40" tires are really 39" on the truck & you want run 2500rpm @ 70mph. You would want 4.11's.

rpm x tire size (divided by) mph x 336
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