4.10 to 3.54 swap
#1
10-21-2012, 10:55 AM
#3
10-21-2012, 11:58 AM
Lead Driver
#4
10-23-2012, 06:28 PM
#5
10-23-2012, 09:08 PM
Lead Driver
#6
10-23-2012, 09:22 PM
Post Fiend
The following is from Pirate4x4...
Carrier split, regular cut: 4.10 down / 4.56 up
Carrier split, regular cut: 4.10 down / 4.56 up
Carrier split, reverse cut: All use same carrier **
** Note: The carrier is the same for all Ford RC 60's UP TO 98, and is the same as the GM/Dodge 4.10 carrier - namely part # 706040X.
BUT - the Ford RC60 was never offered stock with a ratio lower than 4.10 in those years. When aftermarket vendors started making gears lower than 4.10 for RC 60s - they made the ring gear thick, so it could just go on the stock carrier. So if you bought aftermarket 5.38 gears for RC60 - they would likely be thick. Now - if you buy an aftermarket carrier (i.e. locker, spool, limited slip) for your RC60 - I imagine, depending on where you buy it from, they ask "year/make/model" and based on that would likely sell you the 4.10 down Detroit - that way - if you already had aftermarket lower gears, they would just go on the locker. The problem you might run into, is this:. You buy aftermarket gears first - lower than 4.10 and they're thick. Then you buy a locker by ratio, not make and model, and naturally you'd think "I have 5.13 gears - I must need the 4.56 and up locker" but you get hooped because the gears are thick, and won't go on that carrier. Also note, The 2000+ RC60 Fords are offered with stock gears as low as 5.38 - but these are not thick to go on the same old 4.10 down carrier - they are thin and go on the same GM/Dodge 4.56 up carrier. The carrier break is 4.30 and down go on the 4.10 and down carrier. I don't know if Spicer is the only manufacturer offering thin RC60 gears - but the bottom line is - when dealing with an RC60, you do have to match your carrier and gear set.
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