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Thinking 4th gen rear? Swap info inside

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Old 01-16-2016, 06:54 AM   #101  
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Re: Thinking 4th gen rear? Swap info inside

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Originally Posted by Night rider327 View Post
Same goes for third gen and 4th gen cars, heck even second gens.

The same rear end was used with all engine combos, the only difference will be the gear ratios.

Most of the time the 6cyl cars got lower gears to make up for lack of torque from engine. So truth be told, for a performance based build it may be best to start with a good 6cyl. car rear end.

82-85 7.5", 26 spline axles
86-90 7.625" 26 spline axles
91-02 7.625" 28 spline axles
Kool thanks... the v6 out the 4th gen still have higher gears then my 3rd gen but prob go 3.73 anyway
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Old 01-16-2016, 07:04 AM   #102  
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Re: Thinking 4th gen rear? Swap info inside

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Originally Posted by 87zeder View Post
Kool thanks... the v6 out the 4th gen still have higher gears then my 3rd gen but prob go 3.73 anyway
Just an FYI: no fourthgens were equipped with factory 3.73's (some thirdgens were so equipped 83-86, IIRC).

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Old 01-16-2016, 07:20 AM   #103  
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Re: Thinking 4th gen rear? Swap info inside

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Just an FYI: no fourthgens were equipped with factory 3.73's (some thirdgens were so equipped 83-86, IIRC).

JamesC
Yeah I knee that... think closest is 3.42??
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Old 01-17-2016, 10:47 PM   #104  
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Re: Thinking 4th gen rear? Swap info inside

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Originally Posted by 87zeder View Post
Yeah I knee that... think closest is 3.42??
Yep, 3.42 was the highest gear option and the Torsen differential was the highest posi or limited slip option. Here is a video of how the Torsen works. Pretty awesome design.
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Old 09-26-2016, 06:28 PM   #105  
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Re: Thinking 4th gen rear? Swap info inside

Ive been searching and searching but i havent been able to find a solid answer or i might have over looked it on accident. Im going to be putting a 4th gen axle in my 89 camaro that already has stock rear disc brakes and im wondering if i can reuse my original calipers and caliper brackets on the 4th gen rear end? Or am i going to have to but 4th gen calipers and brackets?
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Old 09-26-2016, 07:17 PM   #106  
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Re: Thinking 4th gen rear? Swap info inside

If the 89 is a 9 bolt rear then i dont think you can if its a 98-02 rear. May need a different backing plate. The 93-97 supposively had same brakes as the 9 bolt z28/iroc cars in the late 80's. If its a 93/97, try the bracket/backing plate and see if it lines up
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Old 11-21-2016, 11:50 AM   #107  
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Re: Thinking 4th gen rear? Swap info inside

How strong is the torsen rear? What brakes? axles? the torsen?
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Old 11-21-2016, 09:56 PM   #108  
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Re: Thinking 4th gen rear? Swap info inside

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Originally Posted by bk2life View Post
How strong is the torsen rear? What brakes? axles? the torsen?
Same strength as any other 10 bolt. Torsen is just the brand/style of the posi unit inside, which are all inherently weak because if the small 7.5" ring size.
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Old 03-11-2017, 09:58 AM   #109  
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Re: Thinking 4th gen rear? Swap info inside

Hey man! Just got my first Firebird. Drove it 5 hours home started having humming noise from rear end half way home. Got it home and took it to a buddies shop and the rear end is toast. I am just going to be putting in a new rear axle. But I can't see your swap pictures. Was wondering if you could show me?? I got a 88 Pontiac Firebird Formula 350 Trying to get it done asap and the 4th gens are a lot more common around here.


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Old 05-28-2017, 08:16 PM   #110  
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Re: Thinking 4th gen rear? Swap info inside

Got a quick question. My dad got a rear from a 02 car. He acquired it in hopes of using it for another project. He has decided to do something different and asked if i wanted it. He doesn't know anything other than it's not limited slip and it has disc brakes. I'm gonna get it from him but wondered if it would be worth just swapping the disc onto my drum rear? Assuming the backing plates bolt up. My rear is drum and a 3:08. If this one is the same ratio as mine higher I'll swap the whole assembly. May seem pointless to most of you but my main thing is to be able to get disc on the rear and it's free so I'm entertaining the thought.
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Old 05-28-2017, 09:50 PM   #111  
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Re: Thinking 4th gen rear? Swap info inside

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Got a quick question. My dad got a rear from a 02 car. He acquired it in hopes of using it for another project. He has decided to do something different and asked if i wanted it. He doesn't know anything other than it's not limited slip and it has disc brakes. I'm gonna get it from him but wondered if it would be worth just swapping the disc onto my drum rear? Assuming the backing plates bolt up. My rear is drum and a 3:08. If this one is the same ratio as mine higher I'll swap the whole assembly. May seem pointless to most of you but my main thing is to be able to get disc on the rear and it's free so I'm entertaining the thought.
I had to get a new rear end that isn't posi and has drums. I'm waiting for a posi to pop up before I swap the disc back on. I do agree get rid of drums. But if those fears in that other one are 342 or 373 I swap the whole thing
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Old 05-31-2017, 12:58 PM   #112  
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Re: Thinking 4th gen rear? Swap info inside

Someone help needed! I think i found a good deal, please give me a insight for im only 19, on craiglist near me soneone is selling a g92 rear end with disc brakes, says comes with new brake pads, and e brake line, for 350. Ok price ? Good invedtment? For i have stock rear end and drum brakes
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Old 05-31-2017, 01:36 PM   #113  
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Re: Thinking 4th gen rear? Swap info inside

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Someone help needed! I think i found a good deal, please give me a insight for im only 19, on craiglist near me soneone is selling a g92 rear end with disc brakes, says comes with new brake pads, and e brake line, for 350. Ok price ? Good invedtment? For i have stock rear end and drum brakes
Seems a little high to me, unless it's really low miles. In my area (Central North Carolina) those typically sell for $200-$250. I actually just bought one last week. 3.23 Gears, G80 Limited Slip, G92. I only gave $100 for mine, complete with calipers, sway bar, etc. I did not get e-brake cables with it, but I'd likely want to get new ones either way.
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Old 05-31-2017, 01:50 PM   #114  
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Re: Thinking 4th gen rear? Swap info inside

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Originally Posted by beltran89 View Post
Someone help needed! I think i found a good deal, please give me a insight for im only 19, on craiglist near me soneone is selling a g92 rear end with disc brakes, says comes with new brake pads, and e brake line, for 350. Ok price ? Good invedtment? For i have stock rear end and drum brakes
yeah that's high man. I pulled one from a junkyard for 100 bucks with a 35 dollar core charge
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Old 05-31-2017, 05:36 PM   #115  
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Re: Thinking 4th gen rear? Swap info inside

So a g92 rear end isnt anything thst special ? And what does thr mileage to price ratio look like if 350 is exspensive ?
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Old 05-31-2017, 06:10 PM   #116  
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Re: Thinking 4th gen rear? Swap info inside

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So a g92 rear end isnt anything thst special ? And what does thr mileage to price ratio look like if 350 is exspensive ?
its optional and depends what the car was it was in read below
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Old 05-31-2017, 06:18 PM   #117  
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Re: Thinking 4th gen rear? Swap info inside

If its a 9 bolt out of a 305 tpi 5 spd car it could be the rare 3.45 gear. It be worth it. 10 bolt? I wouldnt pay more than 300 for one with 3.23-3.42 gear and fresh brakes
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Old 06-01-2017, 05:31 PM   #118  
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Re: Thinking 4th gen rear? Swap info inside

124k, thinks 3.23s out of 90 iroc . How much should i offer or limit myself too ?
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Old 06-01-2017, 07:08 PM   #119  
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Re: Thinking 4th gen rear? Swap info inside

i have a disc posi 3.42 rear from an 85 iroc had 40k on it if your interested
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Old 03-19-2018, 09:42 PM   #120  
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Re: Thinking 4th gen rear? Swap info inside

i looked at all three pages and I'm not going to lie I'm tired lol
its been over 8 years since this post was up. I have a all original 90 Iroc vert a4. i have a 4 channel rear end out of a 95 camaro auto. its a complete unit, but my biggest question is how did you guys adjust your speedo? i have 2:73's and am going to 3:23's. I have a few friends that did this swap but with 98+ rear ends but changed the dash and went with dakota digital to fix their issue. I'm planning on keeping mine stock. Thanks in advance

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Old 03-20-2018, 11:16 AM   #121  
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Re: Thinking 4th gen rear? Swap info inside

Cable speedo cars are easy, just change the speedo gears. The electronic speedo might need the digital box signal adjuster stuff. My 91 z28 i did had 2.73 factory and vss electronic speedo. Gm did make two vss style speedo gears, one for 2.73 and one for 3.23 i believe. My 10 bolt was 3.23 so it was easy to buy the gm gear for the trans. If you did a gear ratio out side of those then you were screwed lol and needed a signal converter.
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