Which Diff mount to use when swapping from R200 3.54 to R200 3.90 (ZX) in my '75 280

shadesh · November 2nd, 2009, 05:17 PM

So I bought a 3.90 diff from a 280ZX for my 1975 280Z. The question is which Differential Mount do I use. . the one from 1975 or the one from the 280ZX? I noticed that Motorsport has one for 1972-78 and 79-83.

I hear a clunking sound when I let go off the throttle and I think the Diff mount is shot.

Any feedback would be appreciated. Thanks.!

shadesh · November 3rd, 2009, 11:27 AM

Anyone?

Roostmonkey · November 3rd, 2009, 11:36 AM

You will need to use the 75 mount. Or wait till I make more RT mounts

shadesh · November 3rd, 2009, 12:31 PM

Quote:

Originally Posted by Roostmonkey

You will need to use the 75 mount. Or wait till I make more RT mounts

Thank You. What is RT for? sorry. Whats different about your mounts?

h4nsm0l3m4n · November 3rd, 2009, 01:13 PM

The RT mount design braces and holds the diff from the top so that diff clunk will be eliminated. I run one of his in my car with great results as do many others. Look for Roostmonkey's posts/threads in the Vendor forums on the subject.

shadesh · November 3rd, 2009, 08:12 PM

Thanks! for the info. I appreciate it

November 2nd, 2009, 05:17 PM	#1
shadesh Member Join Date: May 2008 Location: Southern Cali Posts: 31	Which Diff mount to use when swapping from R200 3.54 to R200 3.90 (ZX) in my '75 280 So I bought a 3.90 diff from a 280ZX for my 1975 280Z. The question is which Differential Mount do I use. . the one from 1975 or the one from the 280ZX? I noticed that Motorsport has one for 1972-78 and 79-83. I hear a clunking sound when I let go off the throttle and I think the Diff mount is shot. Any feedback would be appreciated. Thanks.!

November 3rd, 2009, 11:36 AM	#3
Roostmonkey HybridZ Supporter Join Date: Mar 2003 Location: Boston Posts: 485	You will need to use the 75 mount. Or wait till I make more RT mounts __________________ 70 240zt http://www.allmetalfab.net/index.htm

November 3rd, 2009, 01:13 PM	#5
h4nsm0l3m4n Member Join Date: Jul 2008 Location: Portland/Corvallis, Oregon Posts: 83	The RT mount design braces and holds the diff from the top so that diff clunk will be eliminated. I run one of his in my car with great results as do many others. Look for Roostmonkey's posts/threads in the Vendor forums on the subject. __________________ -Stepan -1974.5 Datsun 260z (autocross beater) -http://www.youtube.com/user/h4nsm0l3m4n (some of my autocross videos)

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November 3rd, 2009, 11:27 AM	#2
shadesh Member Join Date: May 2008 Location: Southern Cali Posts: 31	Anyone?

November 3rd, 2009, 08:12 PM	#6
shadesh Member Join Date: May 2008 Location: Southern Cali Posts: 31	Thanks! for the info. I appreciate it