I know that a Limited slip from a 10.5 superduty rearend will fit a 10.25 rear, my question is does it have to be from the same gear ratio?

Could I use a LS from a 10.25 rear with 4.10's in a 10.25 rear with 3.55's?

Or could I use one from a 10.5 rear with 3.73's in a 10.25 rear with 3.55's?

 

Yes. You will need to change the pinion bearing and seal in order to use the 10.5 gears in the 10.25 rear end though.

 

Ok, but a LS from a 10.25 rear with 4.10's would fit a 10.25 rear with 3.55's?

 

As far as I know yes... but ask someone who's got more knowledge than me. Tjbeggs where are ya?

 

Yes, you can use the limited slip with all gear ratios.

 

the 10.5 and 10.25 carriers are interchangeable without issue. Chase is correct about the ring and pinion

 

Ok, thanks fellas.

 

thats what i went threw, got myself into a whole mess thinkig i can set my own backlash, its expensive ill tell ya that. not too many shops..actually 99& of shops dont do them because you need a few specialty tools. its not that bad once you figure it out.

 

I was quoted $650 plus parts to install 3.73 gears in my truck... I think I'll live with crappy fuel mileage!

 

Maybe the crappy fuel mileage is for the rims, bug deflector and sunvisor. IDK.

 

Quit picking on my underpowered, fuel wasting ugly truck

 

I'm happy with my 3.55 gears, just want both back tires spinning...

 

so are the 3.55 gears or the 4.10's better for towing? I am sure I read this on another post somewhere but can't remember where...
Thanks

 

4.10's are better. More rpms from the lower gear. Better take off power as the rpms come up quicker.

 

sorry for the Evan... How can you tell what Gear ratio you have?