I am looking at adding a trac-loc to my F-150. I know I have an 8.8, which I am thinking is a 31 spline. How easy is it to replace the open diff with the LSD or trac-loc diff, really easy? Thanks guys.

Another question. I want better around town getup and go, would 3.73's be better than my 3.55's for that?

 

f-150 8.8s are 31 spline. should be the same as changing a ranger diff.

3.73s will give you more low end torque and help get off the line better at the sacrifice of losing top end. who needs top end around town though?

can i ask a question. wuts your axle code? im having trouble figuring out wut my rear axle is.

 

ryan, it should be the same as the ranger, and you should have a 31 spline. for the gears, the 3.55 to 3.73 swap is not worth the money, you should go to at lest 4.10s, youll find that your city mileage will probably go up, and your highway down about 7-10%. ive already done the research

 

Yea me and Bob talked, there may be a swap in my near future:)

Axle code is on the carrier housing, its on a metal tag.

 

2002 should be a 9.75 rear.

 

ryan, the reason i asked was to possibly have a match.

i was thinking it was the 9.75. i know ive got 3.55s.

 

dang Ryan u goin all out arnt yah...this, roll pan...

how bout u sent some of the green down to me

 

you probably have a 9.75 with that 5.4, you should be able to tell because teh 8.8 has a near circular bolt pattern, while the 9.75 is more wedge shaped

 

Well I am not getting the bumper and rollpan cause it was already sold, so i am looking at increasing off the line power and maybe some around town mpg