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Old 06-09-2005, 04:01 PM   #1
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Gears

Okay guys, I am alittle confused...what is the difference between a 8.8 rear end and a 7.5? I have a '01 auto and I was looking for gears and a T-lok, also what gears do I have now(stock) and what is the difference between those and 4.10? Sorry if this is basic stuff, but remember I'm still learning .
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Old 06-09-2005, 04:15 PM   #2
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well if your looking to race it you want 3.73 for stick 4.10 for automatic as for the differance between the rear ends 7.5 and 8.8 is the size of ring and pinion axel the 8.8 can handle a hell of a lot more hp and torque.. i believe the 7.5 rear is good for 300hp
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Old 06-09-2005, 04:22 PM   #3
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So I probably have a 7.5 right?
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Old 06-09-2005, 04:23 PM   #4
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yeah the 3.8 has a 7.5 the GT has 8.8
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Old 06-09-2005, 04:35 PM   #5
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right, also the 300hp is just a myth. This is something someone came up with a long time ago and some idiot took it as gospel and passed it around. The 7.5 can handle lots of hp and tq, but the 8.8 is definately the better of the two. You have to maintain your rear-end like you maintain the rest of the car. If you don't change the fluid annually to remove water, you're basically gonna have a rear-end that has water for lube. NOT good. Hopefully this will edumacate you some.
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Old 06-09-2005, 04:50 PM   #6
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So what is the best way to go, 4.10 gears and T-lok with my 7.5, or find a 8.8 that already has 4.10 gears and a T-lok?
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Old 06-09-2005, 05:51 PM   #7
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well either actually, I would go with the 8.8 with the gears already in it first because you'll have a stronger rear for the same price basically. New gears and a t-lok will run you bout 400 or so. Install will run you about another 200-300, so about $700+/- some for the whole thing. An used 8.8 will run you about the same amount.
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Old 06-09-2005, 07:57 PM   #8
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It mostly depends on what you want out of your car. If its gonna be a track horse then I would go w/ an 8.8 and 4.10's. If your looking for a few bolt ons for the street stick w/ the stock 7.5 and throw in the 4.10's.
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Old 06-09-2005, 08:00 PM   #9
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If you can find a 8.8 with the gears you want for around the same price as gears and install on the 7.5, get the 8.8, otherwise just go gears and t-lok.
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Old 06-09-2005, 11:41 PM   #10
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I would get an 8.8 with gears already in it, because the install is 1000x easier unless you **** with ABS. A stock 7.5 is good for awhile, as long as you maintain them(like 97stallion said) and you don't run slicks and hook up at the truck. You'll destroy the rear.
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Old 06-10-2005, 08:00 AM   #11
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So can I go to a junk yard and find a rear off a GT? If so, does it have to be from an '01 with an automatic tranny or will other years fit?
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Old 06-10-2005, 08:54 AM   #12
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Yea, you can goto the junkyard and TRY to find a GT. I don't know about around you, but up by me all the people seem to get to the cars and absolutely GUT them before I can get up to the junkyard.

The rear has to be from a 99+ GT definitley. You might have to get the driveshaft if you take it out of a 5-speed. It's prob a better idea to look around on ebay or the internet and see if anyone has a rebuilt one fully assembled for sale. And make sure to read the tag on the pumpkin. It has info in it about the gear ratio and if it's a locking diff or not.

One thing I don't know about the swap is if you switch from a 7.5 to an 8.8, do you have to go with quad-shocks in back? Maybe someone can answer this...
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Old 06-10-2005, 05:25 PM   #13
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it will vbe very hard to get an 8.8 at a junk yard
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Old 07-28-2005, 11:26 PM   #14
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im getting gears for my 7.5, do i need the yukon master install kit or will a shop have everything needed
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Old 07-28-2005, 11:33 PM   #15
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the shop should have everything.
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