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Discussion Starter · #1 ·
I was just needing to know if I can put a posi in my 82 el camino and use the same axles and then put 3.73's in it with out to much trouble iv been looking for a whole rear end assembly that i could just bolt up but i cannot find anything around here
thanks
 

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I was just needing to know if I can put a posi in my 82 el camino and use the same axles and then put 3.73's in it with out to much trouble iv been looking for a whole rear end assembly that i could just bolt up but i cannot find anything around here
thanks
Any of the big shops can supply a tougher differential that will bolt in...

Moser Engineering - Moser Engineering - Home

Currie Enterprises - Custom Rearends, Jeep/Off-road Parts, Crate Rearends, 4x4 Rearends

Tom's Differentials - Home of MADE IN THE U.S.A.
 

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High Performance Rear Ends
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Don't use an Auburn. They are junk. Get the Eaton Posi, Yukon Dura Grip or Power Trax Grip LS. Your car will have 26 spline axles and you will need a 3 series for the standard 3.73 gears.

Be sure to get a GOOD installation kit too. Tom's Differentials and Randy's Ring & Pinion have the best kits. Most others are junk. Ratech is the worst.

Tom's has US Gear, which is one of the best, and Randy's has Yukon gears, which are also good. Good quality gears will make your life much better. Cheap gears will cause you problems.
 

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Discussion Starter · #8 ·
what gears should i get like what are richmond and motive gears or the summit brand are they even worth messing with at all?
 

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Summit sells the good Motive gears and the crap Motive gears. They also sell the good Richmond gears and the crap Richmond gears. The Summit gears are probably going to make noise. Get the good parts. If you want a cheaper installation kit then get the USA Standard kit. It has the good shims, but the cheaper Koyo bearings. Don't get any of the other cheap kits. Summit also sells Yukon kits, which are the same as the USA Standard, except they have Timken bearings.
 

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High Performance Rear Ends
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27 splines on the pinion shaft and 26 splines on the axles.

Yes, those gears would work.

Some people have got away with around 400 HP through the 7.5 rear end, but others have broke them with stock 305s, so you can't actually put a HP number on where it will break. The way it's set up, how it's used, what kind of tires are on it and a few other things can affect how it holds up. Any wheel hop can break it. If the gears and bearings are not set up correctly it will be weaker. Sticky tires will put more stress on it.

Here is something to consider. In '90 the 7.5 was upgraded with 28 spline axles. There are many good 28 spline differentials available for this rear end. This is a good upgrade for any 26 spline 7.5 rear end. There is a good chance that your axles are worn where the bearings run on them and they will need to be replaced. If this is the case then consider upgrading to 28 spline axles.

Another popular upgrade to the 7.5 is the T/A Performance aluminum cover/girdle. This cover braces the bearing caps and adds some strength to the rear end.

I'm not completely sold on the solid pinion spacer, but many people think that it is a must have for the 7.5 rear end. I have one on the shelf that has been sitting there for years and I haven't used it yet. I haven't had any problems so far with crush spacers.
 

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Discussion Starter · #14 ·
im thinking i will just say forget the axles as of right now and when i start looking for more power just find an 8.5" rear end because it will be a few years down the road any thing more than like 270hp will come out of that 305 haha
 

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You probably already know that the G body 8.5 rear ends are rare and hard to find. They were only used in the Grand National, T Type and a few 442s. They are usually kind of expensive too. There are many after market bolt in rear ends like the Moser Engineering 12 bolt and a bunch of 9 inch Fords from many other companies. They are also going to be expensive, but much easier to find.
 

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Another option to the rear end is a FOX body Mustang 8.8. There are parts available to adapt the Mustang 8.8 into the G body cars. All of the Mustang 8.8 rear ends have the Trac Lock differential and there are a lot of parts available for them. You would need to convert it to 5 lug by having the axles redrilled or getting after market axles. You can also use axles from a Ford Ranger to convert them to 5 lug, but it will be the Ford 5 on 4 1/2 inch pattern. This is a cheaper way to go. I can't remember if it's the left or right side Ranger axle that fits the Mustang, but you can't use both Ranger axles because one is longer than the other.
 

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Discussion Starter · #17 ·
i do have another question though the cam went flat in the 305 and we replaced it will a set of lifters and k1103 cam from summit and now when you time it if its on 0 degrees advanced its fine but even on 4 degrees advanced it has a hard time starting sometimes when its warm it acts like it has a dead battery kind of i dont really know any other way of explaining it but we tried to move the distributor a tooth backwards but it will not move from that spot on the cam otherwise if it does move a tooth its way to far basically also my heat only works on one setting for the fan speed iv cleaned the contact points and it doesnt really do anything plus it doesnt blow through the dash vents it blows through the defrost and floor vents only
 

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i do have another question though the cam went flat in the 305 and we replaced it will a set of lifters and k1103 cam from summit and now when you time it if its on 0 degrees advanced its fine but even on 4 degrees advanced it has a hard time starting sometimes when its warm it acts like it has a dead battery kind of i dont really know any other way of explaining it but we tried to move the distributor a tooth backwards but it will not move from that spot on the cam otherwise if it does move a tooth its way to far basically also my heat only works on one setting for the fan speed iv cleaned the contact points and it doesnt really do anything plus it doesnt blow through the dash vents it blows through the defrost and floor vents only
I think you should start a new thread in the Hotrodding basics section describing your issue. Sounds like you have the timing chain off a tooth, a distributor issue, or something else outta whack. Again, start a new thread. You'll find a ton of help. Post part numbers and engine specs.
 

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Hey. Heres what I would do. I would look for a used 7.625 or 7.5/8 26 spline posi and a set of gears. ( Try local salvage yard or ebaymotors).


Doug
 

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A used 26 spline unit is going to be an Auburn. I won't use a new Auburn and I sure wouldn't waste any time on a used one. If you find one that still works it won't work for long. When they wear out the are scrap metal.
 
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