z31p_Z31Wrencher: Forum archive import (z31performance)

2026-05-15T05:08:45Z

Forum archive import (z31performance)

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{{ForumImport
|op_user=Z31Wrencher
|op_date=2012-10-30 21:24:50
|post_count=5
|archive_url=/Z31performance_archive/forum/z31-performance-upgrade-forums/driveline-aa/19675-fs5w71c-compatibility.html
}}

'''Z31Wrencher:''' (2012-10-30 21:24:50)

My transmission, a 1987 FS5W71C, decided to blow up, so I have to get a new one. I found a 1985 FS5W71C at a local salvage yard, but I was told it wouldn't work in my Z (1987 NA). I know the 1984-1989 FS5W71C were the same internally, but some people said they had trouble swapping 1987+ transmissions into 1984-1986 cars. Half of the people I ask say I can do the swap without tapping new holes for the crossmember, half say otherwise. So before I spend the money I just want to get another opinion. Can I swap an 85 FS5W71C into my 87 NA? Thanks.

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'''michaelp:''' (2012-10-30 22:26:50)

The half who say you can't are retarded. They're the same transmission externally..mount and all.

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'''Guardian:''' (2012-11-09 11:53:34)

+1 yeah it shouldn't matter. But I will add, when I ordered my synchro kit from drivetrain.com, they had the 84-86 years separated from the 87-89 years. :-?

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'''862sik:''' (2012-11-10 10:06:55)

Yea it will work 100%. The only thing down there that's different from the years is the driveshaft flange to the differential.

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'''michaelp:''' (2012-11-10 14:39:15)

{{Quote|user=|}}

Yep, there are some differences internally with the syncros but nothing external and nothing that affects if it can/cant be used in any year Z31.

Forums/Z31P/z31-performance-upgrade-forums driveline-aa/FS5W71C Compatibility - Revision history

z31p_Z31Wrencher: Forum archive import (z31performance)