[Diesel_Head]

I have the stock 3.73 gears, if I dont want to lose any power, what will be best for me to change to?

 

[Texascadillac42]

Something in the 5.29 range. If it were me, Id go up to 5.38s.

 

[DBlack1]

A set of 4.88's will get right around the stock ratio, maybe a little more low end. I think anything 5.13 or higher will be too much.

 

[WAMPAKU]

4.56 is great! no problems here /ubbthreads/images/graemlins/grin.gif /ubbthreads/images/graemlins/eek.gif /ubbthreads/images/graemlins/smokin.gif

 

[05superdutyTJ]

Ever seen how small the pinion is on a set of 5.13's?

4.56 for me (and add some power)

 

[Overkill]

I would recommend 4.88 with a 6.0L and 4.56 with a 7.3L.

 

[ThomasT]

[ QUOTE ]
Ever seen how small the pinion is on a set of 5.13's?

4.56 for me (and add some power)

[/ QUOTE ]

Actually I have... Did you know they make up to a 7.17 for the 10.5” rear that is in these trucks? There was actually a post the other day that said 4.56’s weren’t strong enough for a SD. Abuse is about the only think that will destroy a ring/pinion or carrier in these trucks and that can happen stock.

Now, have you seen a 5.13 pinion for a 7.5” Ford rear end..? Now that is small, but yet did its job for a good number of miles in my ranger. I did end up chunking the pinion but it was my fault /ubbthreads/images/graemlins/blush.gif

Thomas

 

[05superdutyTJ]

well, the pinion just gets smaller and the ring gear just gets thicker as you go numerically higher. (lower gears)

If you think about it, taller tires put MORE stress on the pinion and ring gear, as the ring gear only moved at tire speed, so.....

4.88 would be about the max for me.

If I ran 44's, sure 5.13 (and take it easy)

my 4.56's are on a 7.3 w/ 40 to 42" tires. The 6.0 is stock (tires and gears)

 

[mikeym]

[ QUOTE ]
I would recommend 4.88 with a 6.0L and 4.56 with a 7.3L.

[/ QUOTE ]

i 100% agree, check my sig...