?? rear diff ??
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Senior User
Joined: Jan 2007
Posts: 320
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From: modesto,ca
?? rear diff ??
i have a 67 f-250, the tag on the rear says: C71A-DL. below it, it says: 602910 then a space 3.73.
what in the world does this all mean. i think DL=DETROIT LOCKER??
and 3.73 the gear ratio??
any and all help would be greatly appreciated. im currently running a re-built 390 with a .484 lift cam (edelbrock) along with the performer 390 intake and a holly 500cfm 2bbl. just trying to gain some gas mileage. also have a k-n filter with a tornado under it.
what in the world does this all mean. i think DL=DETROIT LOCKER??
and 3.73 the gear ratio??
any and all help would be greatly appreciated. im currently running a re-built 390 with a .484 lift cam (edelbrock) along with the performer 390 intake and a holly 500cfm 2bbl. just trying to gain some gas mileage. also have a k-n filter with a tornado under it.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
Originally Posted by f2501967
i have a 67 f-250, the tag on the rear says: C71A-DL. SHOULD BE C7TA-DL below it, it says: 602910 then a space 3.73.
what in the world does this all mean. i think DL=DETROIT LOCKER?? No. DL is just the Ford engineering suffix (in this case) for C7TA.
and 3.73 the gear ratio??
any and all help would be greatly appreciated. im currently running a re-built 390 with a .484 lift cam (edelbrock) along with the performer 390 intake and a holly 500cfm 2bbl. just trying to gain some gas mileage. also have a k-n filter with a tornado under it.
what in the world does this all mean. i think DL=DETROIT LOCKER?? No. DL is just the Ford engineering suffix (in this case) for C7TA.
and 3.73 the gear ratio??
any and all help would be greatly appreciated. im currently running a re-built 390 with a .484 lift cam (edelbrock) along with the performer 390 intake and a holly 500cfm 2bbl. just trying to gain some gas mileage. also have a k-n filter with a tornado under it.
Last edited by NumberDummy; May 10, 2007 at 03:34 AM.
Hotshot
Joined: May 2004
Posts: 12,170
Likes: 5
From: The hills of No. Calif.
3.73...pretty common gear ration in the F250s of that vintage. I'd look for a 3.54 to swap in, that might help the mileage just a tad. Also. pull off that Tornado-thingy and toss it in trash. Those things actully disrupt the air flow and can hurt your mileage rather than help it. The only thing they have going for them is good marketing...
Hotshot
Joined: May 2004
Posts: 12,170
Likes: 5
From: The hills of No. Calif.
I can't help but be skeptical, the subject has come up many times here...do a search on the site for "Tornado" and see what many knowledgeable folks have to say about it. It's possible that your mileage increase could be due to other changes you made at the same time, possibly a tune up or new air filter, something like that. Like most vehicles, my '68 F250 is very sensitive to the way I drive, and I can vary the mileage by 3-5 mpg just by driving with a lead foot or eggshells...
But hey, if it works for you, then what the heck!
But hey, if it works for you, then what the heck!
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