This is topic How to determine what rearend I have?? in forum Tech Talk at Northern California Ford Owners  .


To visit this topic, use this URL:
https://californiafords.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=6;t=026439

---

Posted by SydeWaySix (Member # 3596) on :
 
How could I determine what 8.8 rearend I have? Are there obvious differences between sn95 cobra, sn95 gt, and Foxbody rearend?
 

---

Posted by 5.0 LsX (Member # 10017) on :
 
is there a metal tag hanging off the cover? that will say the type of rear, year and gear ratio if it hasnt been changed
 

---

Posted by DIRTY SALLY (Member # 7845) on :
 
sn95s are longer based
 

---

Posted by jegg (Member # 9910) on :
 
jack up one wheel and spin the wheel TWO turns and count the revolutions of the drive shaft. about 3 1/2 = 3.55 3 3/4 = 3.72 4 1/8= 4.10


you need to turn the wheel two revolutions because of how the spider gears change the ratio.

i saw this online some where. cant remember where

[ March 20, 2012, 03:36 PM: Message edited by: jegg ]
 

---

Posted by SydeWaySix (Member # 3596) on :
 
Thanks for the info on how to determine gear ratio! I'll try that.

But I'm wondering how i can determine if my rearend is from a sn95 gt, sn95 cobra, or a Foxbody. Are there differences?
 

---

Posted by jegg (Member # 9910) on :
 
ohh.. i see....haha...o well...

hmm...i couldnt tell ya that one..
 

---

Posted by Duncan Motors (Member # 7045) on :
 
the housings are the same on all. fox is fox legnth. sn 94 to 95 is a lil wider . and after that im not sure but i know they go wider and then a year again they go even wider. the difference, is the axle length and the brakes to match the wider axles. on difference in the cobra stuff is bigger disc an calipers and caliper brackets, and the anti moans are different on the cobras as well. gear ratio can be told by how many drives shafts complete rotations, to one rotation of the wheel. like if the driveshaft spun 4 times to one rotation of the wheel, it 4.oo so a 410 gear. 3 1/2 turns to one turn on the wheel would be 350 gears. hope that helps a bit.
 

---

Posted by Duncan Motors (Member # 7045) on :
 
lol u have a ford rearend lol that help? loljk
 

---

Posted by DIRTY SALLY (Member # 7845) on :
 

quote:

---

Originally posted by Duncan Motors:
lol u have a ford rearend lol that help? loljk

---

yea its ford rearend alright

look to see if it has a part num on it that begins with a e like E6 OT E7 E8 ECT or a num that looks like this
2L73A88= 2.73 1988 rear end
 

---

Posted by MUSTTANGUY (Member # 2251) on :
 
All 86-98 8.8 housings are the same, nothing special or different about any of them whether Cobra (93 or 94-98)or standard GT
86-93 uses same axles whether 7.5 or 8.8
94-98 uses axles 3/4" longer per side due to disc brakes than Fox
99-04 is about 1 7/16" longer per side than fox
Cobras will have the larger vented 11" rotors and specific mounting brackets.
Additionally, metal tag on rear cover will show something like 3L08 8.8 which would be a 3:08 gear ratio,traction lock, 8.8 rearend.

[ March 20, 2012, 07:16 PM: Message edited by: MUSTTANGUY ]
 

---