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8.25 rear end

S.I. Coronet

S.I. Coronet

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Do they use the same gears and sure grip for several years/
I have a 74 RR with a 8.25 and on Ebay they have a sure grip and 3.92 gears for an 8.25.
Will it fit?
 
I would not waste my money on anything for an 8.25" rear end....find a complete 8.75 housing, axles, & gears.

the 8.25 is the second weakest unit out there...adding 3.92 gears will not be worth it
 
Starting from scratch by switching to a an 8 3/4 is way too much money, over kill and work for a 318 car.
I can buy the gears and unit, drop off at a mechanic shop in the AM and pick up in the PM and be spinning the tires just the same.
 
I've given the 8 1/4 in my 95 Dakota nothing but hell and it's still holding up fine and you would think that 1600-1700 lb loads in that little truck would have it sitting by the side of the road by now. As for will it fit....I just can't remember. I'm thinking the carrier break is 3.92 and down. I know the Dana 44 is 3.73 and down so a 3.92 won't go in. You might be able to do a google search on Differential Carrier Breaks and see it if will return anything or get a hold of Dr Diff over at the 'other' board. If anyone will know, he should. I've never worked on one but I do know that they are not the 2nd weakest diff out there. Another alternative to the 8 3/4 would be the 9 1/4. Those are pretty tough rears too and are just about everywhere. I have a 3.92 geared 9 1/4 in my 4600 lb Durango. The only thing I don't like about it is the crappy Track Lock LSD in it.
 
This is the factory 8.25 in my 74 Roadrunner.
i would think as long as I have the whole unit and gears it wouldn't care what 8.25 housing it goes in but thats what I don't know?
 
A383Wing said:
I would not waste my money on anything for an 8.25" rear end....find a complete 8.75 housing, axles, & gears.

the 8.25 is the second weakest unit out there...adding 3.92 gears will not be worth it
Click to expand...

Well that is YOU.

there is nothing wrong with the 8 1/4 as long as you aren't there trying to destroy it. the 8 1/4's are holding up to 400 sometimes 500 horsepower. why blow 1,000 plus dollars on an 8 3/4 when an 8 1/4 will be just fine on the street. they are plentiful and cheap. the guy asked for 8 1/4 gear advice , not a new 1200 dollar rear axle
 
S.I. Coronet said:
This is the factory 8.25 in my 74 Roadrunner.
i would think as long as I have the whole unit and gears it wouldn't care what 8.25 housing it goes in but thats what I don't know?
Click to expand...
Yup, you're right. Wasn't thinking about you getting the whole carrier (Sure Grip unit) so it should go on in ok.
 
no carrier breaks in 8.25

Are these gears new or used ???????????????????????????????????????????

If they are used you want the specs they were set to in the other housing, otherwise let em go and get new gears
 
Well I was just basically using them as reference I really want 4:10s because this car is probably not going to leave a 5 mile square area.
I want to rip the the tires loose thru 1st into 2nd like on ice!
 
You would want to make sure the gear set is matched to the carrier. There are SG carriers that came with tall gears and those won't even allow the installation of 3.55's.
 
Its always a personal choice but when I first had my 72 it had the 8.25 and was fine with my 360 but it blew out the spider gears when I put in my 440 and nothing big was done to it at the time just a cam and over size valves and I wasn't racing it at the tine just got on it when driving and they broke. Yes it could have been due to needing a rebuild or something but I swapped out to a 8.75 picked one up from a junk yard luckily. Now it sports a dana 60 also put of a junk yard but completely gone through and changed. Good luck with the 8.25 hope yours does better then mine.
 
Plenty of threads on here about 8.25s holding up fine unless you plan to race it regularly. I've got one in my car, with 3:56 gears. A little revvy on the highway but great on the street.
 
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