Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by TIGHTWORK82 K5, Oct 21, 2002.
anyone know the ratio off hand??
thanks, mike /forums/images/graemlins/k5.gif
Uhhh.....2.73 to 4.10's,How's that for ya??Could be almost anything.Help us help you,give us some #'s to work with.
My 86 has the ratio on the sticker in the glove box. take a look at the options sticker if its still there. If not youll have to open it up to know for sure.
uhh what #'s you want have not pulled the cover to check the gears. just wondering if there was a standard issue set of gears? I found gm33 on one side and b266 on the other. then 40652661 by the axle tube. /forums/images/graemlins/confused.gif
the truck is a 82 w/ 86 drive train go figgure
my 86 came with 3.08s. two of my buddys also came with 3.08s. pull your cover and check it out. probably needs new oil anyway.
My 89 has 2.73's! /forums/images/graemlins/mad.gif
Probably 2.73 or 3.08. If it had a 305 in it probably the 2.73.
Since it's got ten bolts you can skip the 3.23. They didn't put them in a ten bolt vehicle.
If you've got the RPO codes:
so if i have 3.08 or 2.73 /forums/images/graemlins/frown.gif what would be a good setup to go to? I have 35's on it with a new 305 hoped up a bit. when I get on it I get a good jump at first then lag then it catches up again. (does that make since) good highway speeds. over 90mph with alot more to go. but 35's get ruff at that speed. so I was wanting more low end with out sacraficing to much top end!
I'd probably go with 4.56s since you've got a 700R4. If I had a 3 speed I'd go with 4.11s.
Yep, probably 3.08's. I am at the same point now. 4.56's seem like the way to go, especially w/ the 305/700R4 combo.
K5's could only get 2.73's, 3.08's, 3.42's, and 3.73's, (at least '82 and later) so that narrows it down some, if the axles are from a K5 /forums/images/graemlins/smile.gif
Scratch that, I think the military K5's got 4.11's...
there might be a gt4 stamp on it too, i'll take a look when i get home
just pop the covers and look for the stamped gear ratio.
there MIGHT be a stamped in code on the passenger side axle tube about midway between the center section and wheel, facing forward as installed in the vehicle that would tell you ratio and locker/non-locker, but at this stage in our vehicles lives, the gears could have been changed numerous times.
Is it really that bad to pop the covers, get the ratio off the gear, inspect the innards, and change the fluid? (rhetorical question, because I know the answer)
If you don't want to pop the cover off you can still know the ratio.
Put it in gear, lift one tire, mark the drive shaft with a line (chalk is the best ) and mark the tire with a line (with a reference line on the fender), then rotate the tire on full turn while counting the drive shaft rotations, then multiply that by 2 (or was that divide by 2?) anyway the numbers will make it obvious. Even if you don't get the numbers exactly, you have choices for ratios and the closest one would be your ratio.
If its any help at all on semi wishful thinking on ratio, my 86 had a 305 and 3.73s. If you dont KNOW what your ratio is chances are youve never serviced the diff. /forums/images/graemlins/eek.gif Nows a good time to open it up find out your ratio and change the oil. /forums/images/graemlins/thumb.gif
Do front and rear, ya never know what some bonehead previous owner may have swapped in. /forums/images/graemlins/rolleyes.gif
10-4 how much gear oil do I need to get?
any particular brand or type?
around 2 qts each.
get 5 so you make sure you have enough.
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