axle ratio differences
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Junior User
Joined: Jun 2003
Posts: 98
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axle ratio differences
I have a 90 Bronco with 3.55 gears (according to my Ford build sheet) right now. I came across a Ford 9" with 3.50 gears and limited slip. This is an obvious upgrade over my 8.8" with open diff.
However, since the 9" is a 3.50 ratio, and my front axle is a 3.55 ratio, are these axles compatible? I know they aren't the same ratio, but are they close enough? I sure it sould be fine in dirt or snow, but what about using 4wd in the winter and coming across a clean spot of pavement suddenly?
-Jim
However, since the 9" is a 3.50 ratio, and my front axle is a 3.55 ratio, are these axles compatible? I know they aren't the same ratio, but are they close enough? I sure it sould be fine in dirt or snow, but what about using 4wd in the winter and coming across a clean spot of pavement suddenly?
-Jim
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
yes they will work out fine, this is what i am running currently. just dont run 4x4 on dry pavement ever or even wet pavement still may cause a slight bind but in any other surface you will be fine
late
late
Lead Driver
Joined: Sep 2002
Posts: 9,182
Likes: 12
From: Gateway to the West
Guys, not to intrude on the thread but I am sitting here trying to recall whether the 9" and the 8.8 have the same pinion-to-driveshaft setup. I know the 8.8 has the flat flange on the pinion adn the same on the rear U-joint. Will that flange swap or does it need to change? This thread made me wodner whether or not to bring the point up.
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
lets see if i can explain this correctly. my 9" that i swapped in had a had a regular pinion yoke. and my tcase also had the same setup so using my stock ds was no problem. but a fellow FSBr with an 87 tcase same model 1356 had that flat flange type setup. so i guess thats something you need to look out for.
