can you put 4.88 gears in a 7.25 rear ?

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slant six's RULE!
http://www.usajon.com

Yes, if you can find the gear set. The old "direct connection" program had gear sets available in: 4.11, 4.56, 4.88, 5.13. If you find a set, don't even think about running it without a clutch type SG.
I have a 3.91 in my 66 Valiant, a 5.13 in a spare rear housing, and a new 4.56 gear set, used SG (with new parts to rebuild it) and a couple of "A" body rear housings.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

OK

hows that rear hold up
what type of tires r u running?
ever blow that unit?

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slant six's RULE!
http://www.usajon.com

Jon, you saw my Cuda, up at Haggerstown. I used to have the 3.91 rear in that car, running just a couple of tenths slower. I have been running that same rear sinse 1974, in different cars. I rebuilt it one time, mainly to install new SG clutches. It has never failed (knock on wood).
Personally I find that hard to believe, as my engine make over 325 ft/lbs of torque. Right now I am using a 10x28x15 slick, on that rear in my 66 Valiant. I have an 8 3/4 in my Cuda.
On your car, I would sugest you try to find a different rear. The 7 1/4 is stronger then many believe, but it is just too hard to find the parts. It is easier/cheaper to use a different rear, and be less subject to breakage. The only reason I use it, is because I had it left from my stock eliminator days, and I found the other parts for bargain basement prices.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

yes
I saw that puppy @ hagerstown
you took me out of the elimitations
I looked in the rear view mirror as I saw the finish line
and then like in a bad dream
you flew by me
and I was kinda shocked
hopping you had run out
as I had a nice timed lead
and you went on to win all the candy !
dog !
OK
I understand the idea of availibity
but knowing the 7.25 is 100lbs lighter
and can be had free 2cheap
I am just doing some research to know them
4.88's would be nice in a light weigh 7.25 SG
ps
do you run any special fluid in your SG ?

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slant six's RULE!
http://www.usajon.com

No. A street SG should use the special additive, but I don't use it. The purpose of the additive is to keep the SG from chattering on turnes. It actually lets the clutches slip slightly. I have my clutches, tightened up.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Ive comitted to a 7.25 sure-grip complete rear (came from 1968 valiant) that was suposed to be 3.23's but I told the owner to pull and make sure it was just not a welded spider gear set. he did and says it's 2.76's sure grip rebuilt 4K ago
can I put larger gears in this unit?

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slant six's RULE!
http://www.usajon.com

OK. You got he good SG unit (clutch type with 4 spider gears). Now all you need to do is find the ring and pinion gears, in the ratio you want.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

I would like some big gears.
4.88's up
will have tall tires and hopefully an overdrive auto trans...
how hard do you think locating gears will be..
I have not done any serious searches
and most peeps just go to a diff rear
I like the 100lbs weight savings
I doubt I can build a slant six that will blow this rear..
and if I do..I will be going FAST

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slant six's RULE!
http://www.usajon.com

If your looking for new...

The lowest set Randy's Ring and Pinion lists in the Yukon brand is 4.11's.

You may be able to contact Yukon directly to see if they will cut you a set.

CJ

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Part of Tyrde-Browne Racing

thanks!
sent them an email asking...

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slant six's RULE!
http://www.usajon.com

I'm not positive if the R&P from Randy's for the Dakota is the same as the early 7 1/4. I have heard yes, but also heard no. I have never seen the Dakota set so I can't help. Best to ask.
The only other thing to do, is go on every Mopar board and ask. They were only available from the Mopar Direct Connection program, as far as I know.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

look's like randy stuff is yukon and another barnd

early dakota fronts 1988---up something
are the same 7.25 .
can only find 4.11's or 4.10's on inet. new

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slant six's RULE!
http://www.usajon.com

Mary took off work and we went to get the rear from Mark
he gave us an another peg leg 7.25 less brakes and shock plates too.
the sure-grip rear has SS lines too !
he has some neat cars will post those soon.
nice guy.
it was a total $300 purchase
mary put $200 towards my xmas gift here
good girl, mary. true slant lov


this is some of Mark's stuff

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slant six's RULE!
http://www.usajon.com

You mentioned several times that the 7-1/4 is saving you a 100 lbs. What are you using now, a Dana 60. I cant see it being that much lighter than an 8-1/4 or even an 8-3/4.

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There's no such thing as too much cam....only not enough engine!