philiow313 Posted May 27, 2005 Share Posted May 27, 2005 hey guys. its been awhile since i posted here. my 81 280zx 5 speed ate its rear end back in january. i decided to buy a new car and just fix this one later on down the road. so here i am, i bought a new r180 (well, its used from a 85 PU 4x4) and everything works in the mounting, BUT my driveshaft wont go into the pinion flange. the driveshaft circle on the very end, is 2 1/4" across, and the flange is only 2" across. it wont fit into it... i remember the driveshaft fitting into the old differential, so im curious what to do. can i swap the flange out with a different one that fits the driveshaft, or do i need to get a differnet driveshaft? or am i stuck and have to use a different dif? thanks -phil Quote Link to comment Share on other sites More sharing options...
zcarnut Posted May 27, 2005 Share Posted May 27, 2005 It's simple....Just swap the pinion flange with an R180 one that matches the driveshaft. Quote Link to comment Share on other sites More sharing options...
jt1 Posted May 27, 2005 Share Posted May 27, 2005 Steve's right, just swap the flange. This job generally requires a stout air wrench. Why a 180 instead of a 200? John Quote Link to comment Share on other sites More sharing options...
COZY Z COLE Posted May 27, 2005 Share Posted May 27, 2005 Hey Phil.... A little birdie told me you did that doing donuts in rev. gear.... Now I know you better than that , Right?????? LARRY Quote Link to comment Share on other sites More sharing options...
philiow313 Posted May 28, 2005 Author Share Posted May 28, 2005 no no that was in my new car haha. kia warranty baby and i went with a 180 because thats what it had in it and im just going to be selling it afterwards anyways. Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted May 28, 2005 Share Posted May 28, 2005 well r180 was for automatic 280's if i remember correctly... they arent ment to handel a manual transmission. I would suggest going to the pick n pull and dealing with the extra 30 ish pounds probbably worth it. Also it should bolt up to your drive shaft if it is r200 Quote Link to comment Share on other sites More sharing options...
philiow313 Posted May 28, 2005 Author Share Posted May 28, 2005 hey guys. the car came with a r180 in it. it is a manual, so i think they did come this way. anyways... a question again... could i just grind the end of the driveshaft flat and bolt it up like that, would that hold up to just a tad bit of driving until it could be done correctly? Quote Link to comment Share on other sites More sharing options...
RedZ85 Posted May 29, 2005 Share Posted May 29, 2005 Im almost positive that the bolt pattern is different. There were 2 types of companion flanges: 2" and 2.25". All the 73-78Z's had the 2.25" pilot flange. The later models had the 2" pilot flange. Like i said, with the pilot change, the polt patern changed. Quote Link to comment Share on other sites More sharing options...
philiow313 Posted May 29, 2005 Author Share Posted May 29, 2005 Ok. Hmm... so it seems I need to go get a different pinion flange then. Crap. Well nissan wreckers, here i come. Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted May 29, 2005 Share Posted May 29, 2005 i think one pattern is rectangular and the other one is square... can't rmemeber tho Quote Link to comment Share on other sites More sharing options...
wheelman Posted May 29, 2005 Share Posted May 29, 2005 Where is the original diff? Can't you just pull the pinion flange off of it? Wheelman Quote Link to comment Share on other sites More sharing options...
philiow313 Posted May 30, 2005 Author Share Posted May 30, 2005 i already scrapped that dif. it was junk and i didnt think id need it =/ the insides were shot, never thought id need anything from the outside. how wrong i was haha. Quote Link to comment Share on other sites More sharing options...
philiow313 Posted June 6, 2005 Author Share Posted June 6, 2005 hey guys. i went back to where i got the dif from with my driveshaft and they matched up the flange correctly. after 5 months my Z is back on the road! haha its gonna be up for sale, i will post an for sale thread that will run for a week, and after that if not sold i will be junking the car. Quote Link to comment Share on other sites More sharing options...
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