diff problems

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diff problems

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Blazer Forum >> Mechanical & Maintenance >> Steering, Suspension & Drivetrain >> diff problems

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diff problems - 1/22/2008 4:24:22 PM

s10blazerkid

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today i was on my way somewhere and the rear end blows does any 1 know wat gear settings are in a 99 lt 4 dr 4wd blazer? and what kinda of limited slip i should put in it?

Post #: 1

RE: diff problems - 1/22/2008 4:32:27 PM

Millertime21

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you will have to check your rpo codes for your gear ratio. They should be in your glove box.

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

G80 - locking differential

< Message edited by Millertime21 -- 1/22/2008 4:38:30 PM >

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Post #: 2

RE: diff problems - 1/29/2008 12:28:02 PM

s10blazerkid

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yea i have gu6 or 3.42 but i want a locking or limited slip is there a cheep but good place to get them?

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Post #: 3

RE: diff problems - 2/2/2008 10:33:44 AM

s10blazerkid

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ok oso i went to the junk yard and pulled out a bravda rear and its a g80 and will this affect any thing w/ my 4wd?

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Post #: 4

RE: diff problems - 2/2/2008 10:42:35 AM

swartlkk

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From: Waterloo, NY
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So long as it has the same gear ratio as your current rear end, it should be a direct swap.

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Post #: 5

RE: diff problems - 2/3/2008 7:43:34 PM

s10blazerkid

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yea so now i have a rear thats 11.41 and mine is a 12.41 so i won't be able to use 4wd so im just selling it now any 1 need it? its also a posi

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Post #: 6

RE: diff problems - 2/6/2008 1:36:20 PM

drperry

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Neither of those is an S-series gear ratio...

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Post #: 7

RE: diff problems - 2/6/2008 8:01:54 PM

s10blazerkid

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i no it say's that on the big ring gear witch means its a 3.42 and a 3.73 rears

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Post #: 8

RE: diff problems - 2/7/2008 4:06:01 AM

swartlkk

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From: Waterloo, NY
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If you have verified that both carriers are equivalent (ie. that the other one will fit), then you can swap the gears onto the replacement diff and then go through the proper setup of your diff.

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Post #: 9

RE: diff problems - 2/7/2008 2:11:30 PM

drperry

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If it came out of a second gen Bravada, you should be able to swap the gears straight across...

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Post #: 10

RE: diff problems - 2/7/2008 6:47:47 PM

s10blazerkid

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i can? cus my diff is 3.42 gears and it has a 12 spline pinion and the other one was 3.73 and it had a 11 spline pinion so could i swap them? and would that **** w/ my front at all? ( what i mean by swap is take the carrier out and just swap them and not the pinion's?)

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Post #: 11

RE: diff problems - 2/8/2008 2:44:06 PM

drperry

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Take the pinion that's on your current diff, and put it on the G80 out of the Bravada.

If you just swap diffs without swapping gears, you're gonna blow stuff up when you use 4x4 if your wheels have any sort of traction...

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Post #: 12

RE: diff problems - 2/8/2008 5:42:23 PM

swartlkk

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From: Waterloo, NY
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The pinion is the input shaft/gear. The ring is what you will need to swap from your diff to the 'new' diff. You shouldn't need to pull the pinion out of the axle housing. Setting up the 'new' diff will be the challenging part if you haven't ever done it before.

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Post #: 13

RE: diff problems - 2/8/2008 8:53:49 PM

s10blazerkid

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so ur saying that if i just take the carrier and ring gear out of the other rear and jus put it in w/ mine now it would work? so would that change my gear ratio to back to 3.42 rear instead of the 3.73?

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Post #: 14

RE: diff problems - 2/9/2008 3:25:41 PM

drperry

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Ring gear is what I meant...

You're going to need the carrier from the Bravada axle... The G80 carrier is different from the open diff carrier.

Take the ring gear off YOUR diff, and put it on the G80, and that'll keep your 3.42 gears.

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Post #: 15

RE: diff problems - 2/9/2008 3:32:35 PM

swartlkk

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From: Waterloo, NY
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Don't know where you got that idea from... You need to swap the ring gear from your diff to the 'new' diff as I stated in the post above. The ring gear is on the diff. The pinion is in the axle housing. The pinion can stay put, but the ring gear most definitely needs to be swapped.

Now, let me say this, if you are having trouble at this stage, do not go forward with the swap on your own. Setting up a rear end to run right is not for the faint of heart and will take several attempts to get everything correct. You can do MUCH more harm than good by swapping things out and not getting them setup properly.

This might help:
Setting up a Differential Ring & Pinion - thedirtforum.com
Don't Let Her Rear End Scare You (4 pages) - streetrodstuff.com

From these two articles you will find that it isn't a simple process of swapping parts. Also note that not a lot of what is done in the SRS article apply to the rear axles in our car. This primarily pertains to a Ford 9" setup in terms of how to set the proper pinion depth.

< Message edited by swartlkk -- 2/9/2008 3:37:39 PM >

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Post #: 16

RE: diff problems - 2/9/2008 9:45:12 PM

s10blazerkid

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well today i took the g80 rear out of the other diff swaped ring gears and when i went to put it back in it was kinda tight and then i got one side of the axle in and b4 that i couldn't turn the pinion by hand so wat did i do wrong?

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Post #: 17

RE: diff problems - 2/10/2008 2:30:10 AM

drperry

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You have to make sure it's shimmed properly... Everything has to be aligned right.

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Post #: 18

RE: diff problems - 2/10/2008 9:10:04 AM

s10blazerkid

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how else could i shim it then if i used the shims that i got w/ that rear from the diff?