rear end gears

[Kid Racer]

Hey guys well I tuke my diff. cover off last night and I counted the gears to see if any one can tell me what size gears I have . The little gear has a 11 teeth and the big gear has 42 teeth . Can anyone tell me what size gears I have....

[alamantia]

Divide 41 by 11

[Kid Racer]

okay why would i divid 41 by 11 when it is 42/11...any way i did both 41/11 cam up to 373 and 42/11 came up to 382...but isnt 382 ford gears

[alamantia]

you have 41 teeth on your ring gear, count again.

[alamantia]

ya know, i just thought of something, i shouldnt say that without asking, is it a 10 bolt or a 9 bolt?

didnt some 9 bolts offer a 3.9 ratio?

[Kid Racer]

Well i'm just going to take your word for it . Cause I counted 4 times last night and I done put the oil back in it . So I aint doing it again i'll juss take ur word for it..

[Kid Racer]

It's a 10 bolt with after markit parts in it

[alamantia]

41/11 = 3.73
43/11 = 3.90

motive makes both

[Kid Racer]

motive makes both what

[Kid Racer]

isnt there away to find out by sping the tire to

[WildBillyT]

motive makes both what

Ring and pinion sets.

[WildBillyT]

isnt there away to find out by sping the tire to

Yes but it's even less precise.

Motive may stamp the number of teeth onto the outer lip of the ring gear. Spin the axle and see if you can read anything on the ring gear. Wipe the gear off if you have to.

[alamantia]

isnt there away to find out by sping the tire to

yes, mark the tire with a piece of tape or chalk or crayon or blood or nail then do th esame to the drive shaft. Provided you have a clutch style posi where you can spin the tire and the opposing tire spins equally, spin the tire one complete revolution and count how many times the driveshaft spins. However the difference between a 3.73 anfd 3.90 wont be able to be seen as they are so close and there is a backlash between the pinion and ring gear.

im 99% sure you have 41/11 3.73's, its very common and they only make speedo gears for 3.73 not 3.90's because some s-10 blazers with the 700R4 had that speedo gear option. i dont know if speedo gears were ever availble for a 3.90 set. Im guessing you gotz 3.73 whic is an excellent gear for an auto f-body

[V]

this thread makes baby jesus cry



plus the 9 bolts only went up to 3:45s stock

[98tadriver]

you have 3.73s