7 1/4” SG

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SGBARRACUDA

SGBARRACUDA

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Just picked up a 7 1/4” with a Dana clutch sure grip. Strange thing is it has a 3.90 ring and pinion. Was this very common?
 
SGBARRACUDA said:
Just picked up a 7 1/4” with a Dana clutch sure grip. Strange thing is it has a 3.90 ring and pinion. Was this very common?
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Crapped if I know. Is it big or small bolt pattern?
 
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I’d say it is rare. I’ve never seen that ratio in that size axle.
 
Kern Dog said:
I’d say it is rare. I’ve never seen that ratio in that size axle.
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Usually 3.55 gears on the 7 1/4 sure grip package in 63-65. I had a set. They also had funky bolts... they shouldered to the carrier holes and then to a smaller thread size than say a 1971 ring would have.
National drivetrain sold 3.91 for them.
 
A picture.

E11B7448-1126-4CEF-89E8-59FB144E08A2.jpeg
 
That has to be aftermarket.
Interesting piece though. I suspect that the SG would increase the durability of it
 
Kern Dog said:
That has to be aftermarket.
Interesting piece though. I suspect that the SG would increase the durability of it
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The Dana Power Lock was an option for the 7.25. That doesn't look 50 plus years old though, does it?
 
Well,I don't know about that,never opened one up. They were so abundant and cheap I just replaced them when I had a problem.I do know from the sales lit I have collected that they came with 323,355,and 390 ratios and offered as an option on any A body in the mid 60's .They were also part of the towing package that the wagons had and were more than likely offered in other models as well. And back in the day we as consumers could pretty much order anything we wanted from the dealer unlike today's take what we have on the lot mentality
 
Well this 7 1/4" rear is going to a new home. RRR is the new owner. Thanks Rob Now I just gotta figure on when I can get it to him.
 
valiantwagonguy said:
Well,I don't know about that,never opened one up. They were so abundant and cheap I just replaced them when I had a problem.I do know from the sales lit I have collected that they came with 323,355,and 390 ratios and offered as an option on any A body in the mid 60's .They were also part of the towing package that the wagons had and were more than likely offered in other models as well. And back in the day we as consumers could pretty much order anything we wanted from the dealer unlike today's take what we have on the lot mentality
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I have a '67 with the 7 1/4 SG. Interesting about the ratios. So the SG always had better ratio's than the peg leg 7 1/4?
 
Just add a little to this thread. You could get many different rations for the 7 1/4 right from Mopar, "back in the day".
3.91, 411, 4.56, 4.88, 5.13. I heard a 5.38 was also available, but have never seen one, or seen anything on "paper. The others, I can personally confirm. I still have a 5.13 gear set, and a "new" complete rebuilt bbp "A" body 3.91 SG 7 1/4 drum to drum.
 
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