I want to find a 90up, posi, disk, 3.42 gear'd rear end. When I go to the junkyard, how will I know I've found what I want? Is there a code somewhere stamped on it? I really dont want to pull the cover off a bunch of diff's and count gears, is there a better way?

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Rob
'86 TA 305 TPI
Gutted MAF
Ported Plenum
TB Bypass

 

ttt

 

You will still have to pull the cover but.......Pull it off and spin the gear around until you see numbers stamped on it. Bring a calculator with you. There will be a ratio in the format XX.XX such as 62:17. This is a ratio off of a locomotive but you get the point. Do the division in the calc and you got it.
bsa

[This message has been edited by irocbsa (edited February 07, 2001).]

 

Those rears only came on 305 5-speed cars with dual-cats. So look for those. You can also spin the wheels and count the number of times the driveshaft spins. It'll be 3.42 times or so (round it to 3.5)

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