what do I have

mxshee

Active Member
Joined
Feb 28, 2007
Location
Lexington
I have a 86 grand wagonner,I think the diffs are 44's. I am wanting to put them under my xj ,and was woundering how to tell what the gear ratio is in them.Only the I did find told me that they were free floating.New to this all the help would be great thanks.
 
I seriously doubt you have a FF 44. If you can't tell from the diff ID, look for two numbers on the BOM that would probably be the ring count and the pinion count. If you can't find that, you can do it the ghetto way and put the t-case in neutral, jack up the rear, and count the number of rotations of the driveshaft it takes the make one revolution with the tire and make an educated guess from that. OR you could pull the cover and count the teeth and the divide the ring by the pinion count. Most likely its something like a 3.08 or 3.42.... nothing too terribly deep; you'd probably be looking to regear.
 
86 "should" be dana 44 front and rear, but could still be an AMC 20 rear. If the rear pumpkin is perfectly round, then its an AMC 20 (1 piece shafts).

stock gear ratio is 2.72 and 3.31s were an option.
 
I appreciate the clarification ajbirken.. it's hard to remember all this stuff. Mxshee- if you want to keep the axles under your grand waggy, I have a driver's side drop 44 and amc 20 with 2.72s I'll let go.
 
No need to count teeth. If you pull the diff cover, the tooth count for both the ring and pinion are on the ring gear.
Something like
11 42
 
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