7.5 to 8.8 RABS question

[laser3kw]

I will be doing a 7.5 to 8.8 rear swap in my '99 ,3.0, 2wd, manual trans, in the near future. I have a 8.8, from a Ranger, with the same gear ratio as my 7.5 plus Trac Loc!
I know the bolt up part between the two axles is the same. My question is : will the ECU have to be reflashed due to the bigger, hence more "teeth", RABS ring? And if so is there a specific code or item they would look for to get it right the first time?

 

[martin]

That's an interesting question. the ring is bigger but does it actually have more teeth. If you have both axles perhaps you could count the teeth and post up what you find.

 

[wizkid00104]

I just did this swap and didn't run into any issues, but mine is a 94.

 

[rangertoy]

I had no problems on my 99

 

[laser3kw]

Rangertoy-
The reason I am concern is that the RABS ring runs our speedo. Have you verified that 10 miles on the odometer is 10 miles on the interstate mile markers or GPS? Just asking. I see you have larger tires and such. Have you used a tuner or such to recalibrate you speedo or how did you figure your new speeds?

 

[rangertoy]

I had my wife get beside me on the interstate in here car(which is stock) and we were on like 2-3 mph off and I figure that is close enough considering that no 2 speedometers are going to read the same

 

[95Rang515]

its actualy the size of the teeth that matter. it determines speed the number of teeth that pass it the sensor per a unit of time. it cant actually tell if the ring gear has made on full turn or not. if the teeth were smaller then it would read more teeth per rotation and read faster and just the oposite for larger teeth. the up side side about this method is that if the speedo reading come from the axle and not the tranny you can change the ring and pinion ration without a change in speedo reading