rear axle ratio RPO

[bww3588]

Quote: Originally Posted by Gspot

i have an 87 s10 2.8L 5 spd 4x4 with a 3.73 posi, i've broken some of the disks in the posi and theres gettin to be a good build up of shrapnel on the magnet, so im lookin for another rear end, does anyone know if theres any problem with putting in a 83 blazer rear end?

as long as its 4x4 and your 87 dosent have ABS. i think in 87 they started puttin ABS on em. so the 83 wont work if yous has ABS

[Gspot]

i realized that the 83 was a 3.42 ratio, so thats outa the question, but i found an 89' 4.3L blazer 4x4 and the guy says its a 3.73 govnerlock, and he only wants $100 for it. I dont know if its got abs but i'll ask him. if it does, is there any way to make it work in my non abs truck?

[bww3588]

Quote: Originally Posted by Gspot

i realized that the 83 was a 3.42 ratio, so thats outa the question, but i found an 89' 4.3L blazer 4x4 and the guy says its a 3.73 govnerlock, and he only wants $100 for it. I dont know if its got abs but i'll ask him. if it does, is there any way to make it work in my non abs truck?

if yours dont have ABS which it should because its an 87 but any rearend will work if it dosent have ABS then your good but if the rear has it just leave it unhooked and take the sensors off from behind the axles before the tube.

[bluestreak2.5]

My 85 has descriptions next to the codes on the sticker, and they're telling me it has front and rear locking diffs with 4.11s.

[1slammedx]

the g80 is an EATON locking diff. It locks when a 100rpm difference is detected between the two side gears-the two spider gears that are splinned to the axle. it also will not or should not lock over 20 mph. it is an interesting little setup in the case. my 02 s-10 standered cab xtreme with a v-6 and a 5spd has the g80 and the 3.08 gears. it is a 8.5 ring and pinion. the same case that is in the fullsize silverados with the 8.5 .the easyest way to tell between the 7.65 and the 8.5 is the diff cover and gasket. the 7.625 is more oval shaped and the 8.5 is circular.

[s10-den]

Quote: Originally Posted by RedSpeck_09

i just checked my beater and its says GT5. that just doesn't make sense to me. a 4 banger with a 4:10 ratio? its a 95 2.2 5 speed. can anybody tell me about this?

the 4 bangers need the gears to get them moving

[s10-den]

Quote: Originally Posted by DimeTime

I have a 01 w/ 4.10, and i was wondering how much of a difference it makes in acceleration, and in gas milage, if someone has changed from 4.10 to 4.56

you dont want to do that....you will not tell the difference but you will in gas mileage.by the way,I live here in T-town too.

[low97s10]

is there any way to tell what gears you have without the rpo codes and with out pulling the rear cover. my rear end went out a couple years ago and i got one from a junkyard. he said it was the same as mine but it had the third shock and it is a diff ratio. mine had 3.73's and this is lower (3.42 maybe?) speedo reads 50 and im actually around 55

[squaredime]

any reason I have GQ1 AND GU6 on my tag in the glove box? could they not make up their mind between 3.42 and 3.73?..ool

[15sorbigger]

ok got a 89 s10 2.5L "ID", the codes i got are gq1 gt4, whats the deal.

also i want to put 22 150 spoke knock offs. is it possible or a dream.

[mikewiebe1987]

mines has three codes, gu6 g51 then g80 am i missing somthing retarded simple

[Bob35josh]

i have an 88 x cab 2.8 auto. it has 3.08's according to the codes on here. i also now have an 85 x cab with 2.8 auto. it has no sticker in the glove box and i havent got to drive it yet....still waiting on motor to be dropped. does anyone have any clue what it might be? its like i said 1985 2.8L x cab auto, s-10 tahoe, loaded out, power windows/locks, tilt wheel.
help me, please. anyone....

[2003blackchevys10]

what would it help if i changed my 2003 2.2L 5 spd from 3. 73 to 4.10 ???

[bww3588]

Quote: Originally Posted by 2003blackchevys10

what would it help if i changed my 2003 2.2L 5 spd from 3. 73 to 4.10 ???

nothing, it would make your MPG drop and 1st gear useless.

[Deezer]

I have a 2002 xtreme truck.Sorry can't seem to delete thread reposting under new thead.

[sandfly]

one way to tell what you have in gear ratio is to jack up the rear and mark the drive shaft and tire...now turn the tire one revolution and count the time the mark on the drive shaft goes aroun..it should give you a good estimate if you do it right..(3 time =308) (3.5=3:42)(3 and 3/4 apprx. =3:73) etc..

[babyboyfuz8]

should i stay with my 3.08 gears or switch to 3.42? in my 99' 4.3 gas mileage don't bother me, i want a little more torque, would that be 3.42?

[lowereds10extcab]

you said that the lower the ratio the better gas mileage... i have a '93 s10 ext cab, with a 2.8l v6 5spd and it has 3:08
gears and revs at like 5000rpm and drives at like 55 max... horrible gas mileage, i went on ALL Data and Mitchells and it told me that truck should have either 3:73 or 4:11 gears, im not sure of the numbers in the glove box but since you said that the 4cyls should have the 4:10's then does that mean i should have the 3:73's?? if anyone can help please email me jon_brown06@yahoo.com

[runuover]

i have a 95 blazer that says gu6 g80
i remember spinning one tire when ever i took a rite and both on a hard left
sometimes i could lock both on power brakin so does that mean i have a limited slip
id really like to know b/c that blazer was totalled and now i have an s10 w/ just gu6

[lstude]

I put a 2002 Sonoma rear in my 52 Studebaker. I bought it from the S-10 Warehouse but I couldn't remember what the ratio was. This thread sure helps.

Does anyone know if you can get gears lower than 4.56 for the 7.5 or 7.65 rearend? I am looking for 4.88 or 5.13

[flickjo94]

Quote: Originally Posted by speedydtp247

i'm lost. exctaly what row/column do i look at to find out what gear ratio i have?

the codes are listed in the glovebox in alphabetical order

[Head]

G75 mean anything?

[krazybronco]

ok i swaped out the original diff because the housing was broken from a wreck
so does the axle have an axle tag like ford do
if not how do i find out what it has now

just wondering

[Dranko]

does anybody know the top speeds on these different rearends with the vortec 4300 and auto tranny

[Woolford]

so the G80 is the locking diff, does that mean i have a POSI or i dont?? And i have the 3.08 gears. Im not to familiar with this stuff so are the 3.08 gears good lol??

[89-S-Dime]

Quote: Originally Posted by DoubleDown

GU4=3.08
GU5=3.23
GU6=3.42
GT4=3.73
GT5=4.10
HC4=4.56

G80 - locking differential


compare to the codes in your glove box to know which gear ratio you have

Just wanted to add that H04 = 4:11 is found in pre-1994 S10's (most commonly 4x4 Jimmys and Blazers)

[Jr's z]

does anyone have a 4.3 5 spd w/ 3.42's or 3.73's.. hows the gas milage, and the revs at 100kms/60mph?

[Woolford]

ya i have the 3.73's. Gas is a lil better than autos at like 20mpg but still shitty. And if i can remember i think my rpms are around 2500 at 60

[sippiwhiteboy]

I have a '87 2.8 extra cab 2wd. The code says it has 3.73's. Is this why 1st gear is more or less a granny gear? My heap is turnin 4500 rpm at 65-70 mph. Should I change the dif or tranny?

[hbii]

my truck has 2 codes listed it has GU6 and GQ1 so what would my Ratio be

[Blublazin]

My blaze has 3.73 behind a 6sp. With 315 x 35 x 17 tires. Turning about 1800 RPM's @ 75 MPH.

[trinityaqk]

I have a 2002 4.3 5 speed. I want to give my truck some more power/torque. I think my truck has the 3.73 rear end and I was wondering what would happen if i swapped that out for the 4.10 rear end? Is it correct that the 4.10 rear end comes in the 4 cyl s-10?

-Eric.
Trinityaqk@gmail.com

[blue blazer ed]

I have a 83 Blazer with a 2.8 . Im looking to chrome out the rear end.

Going to junk yard to get one so my Blazer wont be down while this is happining. My question witch rear end should I look for , what year to what year to look for, and will the U joints be the same?