RE: Pros/Cons
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RE: Pros/Cons - 4/6/2008 6:31:24 PM
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TripleBlackBlazer
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No, just kidding. You're right. The spacer will be CNC machined. I know Jeg's and Summit sells them, I just didn't see anything for the 7.625 rear, only for 7.5 and 8.5's.
EDIT: I wonder if the pinion is bigger for the Bravadas? That's the only way I could see the ring gear being set back further than on my Blazer with 3.42's.
< Message edited by TripleBlackBlazer -- 4/6/2008 6:40:34 PM >
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RE: Pros/Cons - 4/6/2008 6:35:13 PM
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drperry
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If I had the 7.625" I'd crack it open and take pics as well... Or at least see how it compared...
Maybe he got the year wrong?
Count the splines and make sure it's 28, not 26...
Might be a 7.5"
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RE: Pros/Cons - 4/6/2008 6:36:44 PM
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TripleBlackBlazer
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It's definitely 28 splines because I test fit my axles in it.
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RE: Pros/Cons - 4/6/2008 6:38:08 PM
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swartlkk
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Machining alone will not make the spacer completely flat. A grind operation may have to be done to ensure that the two surfaces are completely parallel and flat. You will then probably need to have it hardened as well to eliminate the tendancy to flex. We are talking about large forces here.
You might be able to go with the 7.5" spacer... Not sure...
< Message edited by swartlkk -- 4/6/2008 6:46:05 PM >
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RE: Pros/Cons - 4/6/2008 6:39:38 PM
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drperry
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They SHOULD be the same... But I can't say for sure...
I can't see the ring gear being different between a Bravada and a regular S-Series...
Mine is different, but that should be it...
< Message edited by drperry -- 4/6/2008 6:49:03 PM >
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RE: Pros/Cons - 4/7/2008 6:24:19 AM
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TripleBlackBlazer
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The bolts that hold the ring gear to the carrier that I took out of my truck are fused into the carrier itself. Can't reuse the ring gear.
Performance shop around the block has 3.08's (ring and pinion) lying around for $50. I plan on purchasing the 3.08's and having them install it since I'm already in over my head and don't have the tools available to me to set backlash and all that jazz.
My head is spinning right now so I'm not sure if I need a spacer or not. But if I do I have received confirmation that a 7.5 spacer will also work in my 7.625.
Will update ASAP. Might be carpooling for a while with the Regal I'm about to go pick up.
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RE: Pros/Cons - 4/7/2008 3:19:45 PM
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drperry
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According to the auction....
The diff will only work with 3.23 or higher... So 3.08s might not work.
I think the difference is that this is a series 3 instead of a series 2.
According to the Auburn website:
Special Note: GM 7 5/8” applications use (2) different tone wheels depending on the differential case series.
3.08:1 & down gear ratios - Series 2 Case
3.23:1 & up gear ratios - Series 3 Case This is most likely for Auburn made parts, but still... Maybe the guy got it wrong and it's a series 2? If the shop has a 3.08 sitting there, ask them to slide it on the new one, and compare, to see how it sits... 3.08 should have more metal in it.
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RE: Pros/Cons - 4/7/2008 7:04:00 PM
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TripleBlackBlazer
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For strength reasons? My options for the G80 are 3.08's or 3.73's but I really don't want to swap out front gears, too. I can do the 3.08's and lose 4WD (for now) for $50 plus his cost to put them in.
OR I can order/find new 3.42's and buy a spacer and still pay his cost to put it all in.
3.08's are cheaper in the short term but more expensive long term.
3.42's are more expensive in the short term but cheaper long term.
BUT if it's a strength issue where for some reason a certain gear ratio can't handle the G80 then it's back to the drawing board.
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RE: Pros/Cons - 4/8/2008 12:49:22 AM
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drperry
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I don't think that's an issue with it... But, if you plan on getting bigger tires... I'd reccomend the 3.73's, lol.
I don't think it's a strength issue... I haven't really seen a gear limit for the G80, other than the obvious size constraints...
I'd reccomend going with the 3.42's... You might even be able to find one that fits properly without the spacer...
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RE: Pros/Cons - 4/8/2008 5:04:34 AM
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swartlkk
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No, I do not believe that it is a strength issue either, but rather one that the G80 was not offered with that high of a ratio (numerically lower). For some reason it sticks out that 3.42 is the highest ratio that the G80 was offered with, but I could be wrong...
Maybe I missed it, but what gears do you currently have?
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RE: Pros/Cons - 4/8/2008 5:08:08 AM
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TripleBlackBlazer
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Currently have 3.42's (GU6). If I could find 3.42's to work in a 2 series carrier without a spacer that'd be perfect.
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RE: Pros/Cons - 4/8/2008 5:15:37 AM
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drperry
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Might have to work to find 3.42's for a series 2...
Should've just went for the ZR2 axle and put 3.42's in it, then the rear axle would line up with the front 
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RE: Pros/Cons - 4/14/2008 8:10:56 PM
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TripleBlackBlazer
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Is there anyway to identify what I bought by the stampings on it? I've said my piece to the guy but I want to have correct information before I tell him he incorrectly listed this part.
On the non-ring gear side it has "049-1" and in smaller typeset it has "18 F5" and possibly an "H" directly opposite from the 18 F5. The ring gear side has a 4 stamped into it.
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RE: Pros/Cons - 4/14/2008 10:53:16 PM
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lennyblazer
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No idea about the stampings on the locker, but I would go with 3.42 or 3.73 gears (all 3.08 gears might do is help increase gas mileage, but the 3.42 and 3.73 will have more torque to the wheels).
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4.3L Auto. 3.73Gears
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RE: Pros/Cons - 4/15/2008 3:14:56 AM
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drperry
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quote:
ORIGINAL: lennyblazer
No idea about the stampings on the locker, but I would go with 3.42 or 3.73 gears (all 3.08 gears might do is help increase gas mileage, but the 3.42 and 3.73 will have more torque to the wheels).
3.08s would actually hurt city mileage a good bit... And highway mileage would only get better if it's mostly flat... The Blazer is kind of a heavy vehicle... 3.42s or 3.73s would work best for lots of city driving...
As for the fact of the matter... It's a series 2, since it does NOT support the gears that he has listed unless you get specially made gears for going from a series 2 carrier to fit a series 3 setup.
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