seanmballesteros
Newbie
does anyone the stock ratio of 10 bolts in an 87 k5
CK5
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axle ratio
- Thread starter seanmballesteros
- Start date
Redwookie
1/2 ton status
Check the code sticker in your glove box. There should be a long list of codes then cross referance that with the code listed on this link.
http://www.73-87.com/7387info/7387rpo1.htm
http://www.73-87.com/7387info/7387rpo1.htm
Stock ratio depended on a few things, you can look at the brochure page to figure it out, if that portion is legible for your '87. No direct link, sorry. Searching "brochure page dremu" works on yahoo for me. 
vortec
1/2 ton status
maybe he's like me and has no rpo code sticker in the box. 
probably 3.08:1
probably 3.08:1
Redwookie
1/2 ton status
vortec said:maybe he's like me and has no rpo code sticker in the box.
Then check your inner wheel well. If not open it and count the teeth.
vortec
1/2 ton status
nobody has mentioned the ghetto method, yet. just put the rear on jackstands, put the tranny in neutral, and turn the driveshaft until the tire makes one full revolution. count how many times the shaft went all the way around and that's your approximate ratio. it's not perfectly accurate, but 3.08 will be about 3 turns. 3.42 is about 3 and a half turns, etc. do it a few times and sort of average it out.
That's not ghetto... That's the easiest way. No gear oil to drain and refill, no gaskets, no bolts. If its off the truck, pull the cover.
GEORGIA GABE
1/2 ton status
my 87 had 3:08s
loafer
1/2 ton status
The two K5's I have owned, an 88 and in 86, came stock with 3.42s on 31in tires.
seanmballesteros said:
Ive owned a 78, 84, and an 83 half ton, and drove an 86 and 87 and all of them had 3.08s. the 85 I have now is the first one Ive ever seen with factory 3.73s. most likely its got 3.08s but you may get lucky.
kp texan
1/2 ton status
Mine came stock with 2.73s so yours could too.
-Wes
-Wes
chevy wrangler
1/2 ton status
??? wheel well???Redwookie said:
4xcrazy
3/4 ton status
repaired a friends Burb that had 3.73's in it,,,so obviously you are going to have to do some digging, or even better yet, just pull the cover,,,,always a good idea anyways, check your gearing numbers, inspect the internals and replace the oil with fresh stuff
btw, you don't NEED to "count the teeth" the numbers are stamped right on the ring gear.
btw, you don't NEED to "count the teeth" the numbers are stamped right on the ring gear.
Redwookie
1/2 ton status
chevy wrangler said:
Yes my friend's 82 1/2 ton had the RPO sticker on his wheel well. I've seen it a couple times before then as well. Just worth a shot I thought.
chevy wrangler
1/2 ton status
which one?
Redwookie
1/2 ton status
chevy wrangler said:
Uh it's been a while, I'm pretty sure it was on the driver's side. It was in plain view though so if it's there you should be able to see it. Unless It's covered in mud
85mudbogger
1/2 ton status
just a tip if its not a posi u can only jack one wheel up and turn it two full turns to get the correct ratio.vortec said:
gator688
Registered Member
My 87 come with 3.42, just take the cover off and find the stamping to be sure, probably needs some new fluid anyway, its probably the origanal fluid with how many miles on it?
