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Apr 23, 2004 | 10:32 AM

SVTYONE

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From: SANDIEGO

Differential

I Was Wondering If Anyone Knew What Size Rearend My 1971 F250 Camper Special WITH A 390V8 Has.the Truck Is A Manuelwith Grannygear.also If I Change My Rearend Gears Will This Affect The Power Of My Granny Gear. Open To All Suggestions.

Last edited by SVTYONE; Apr 23, 2004 at 10:33 AM. Reason: LEFT OUT WORDS

Apr 23, 2004 | 06:29 PM

mark a.

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It's a Dana 60. Yes it will affect it, but it probably wont be very noticable if you don't stray too far from the origanal ratio.

Apr 24, 2004 | 04:42 PM

fordbeast_80

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From: South Dakota

Well it depends on what you want to change your gears to? and if your rearend has a tag on it if you put the numbers on here someone could help decode it.

Apr 26, 2004 | 10:26 AM

SVTYONE

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From: SANDIEGO

Thanks

Quote:

Originally Posted by mark a.

It's a Dana 60. Yes it will affect it, but it probably wont be very noticable if you don't stray too far from the origanal ratio.

THIS INFORMATION IS HANDY. WOULD YOU HAPPEN TO KNOW WHAT THE GEAR RATIOS ARE STOCK AND ARE 3.73 TO MUCH.I NEEDED THE DIFF SIZE SO I CAN BUY AN AIR LOCKER OR PRICE A POSI-TRAC.

THANK YOU

Apr 26, 2004 | 03:13 PM

Torque1st

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Please don't post in all caps. Get the numbers off the diff you have and post them here. There was no "stock" ratio. You can also get those numbers off of your diff and call the companies that sell axle parts.

Apr 27, 2004 | 07:40 PM

Like M. Fords

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From: LAT 46.55501° & LON -122

Unless you change the rear ratio drastically, you won't notice much difference in granny gear. It is the engine RPM at hiway speeds that will have the biggest/most noticeable effect on a rear gear change.