I'm doing my 3800 sc swap. I bought a "custom" PASS axle from someone on here. I installed it today and found it too short. the axle measures about 24.5 inches long and the middle part of the axle (case to hub) is about 16.5 inches. When I measure the distance from the trans to the hub I get about 18 inches. So thats about 1.5 inches too short. When I tried to install it the one boot started to get stretched out. I'm using FieroX mounts. the Driver side fits fine. Could the seller have sent me a axle thats too short?? My cradle is from a 1987 4cyl with the uni-mount (now cut off). How long should the PASS axle be?

I have always used a Fiero drivers side axle with a GTP passenger inner tripot on it and it has worked with FieroX mounts, Transport Van mounts, WCF mounts, and my own home made mounts. Though I couldnt tell you the measured length.

[This message has been edited by Mike Gonzalez (edited 10-25-2012).]

I email the seller to get their take on this? Good thing I saved my old Dr side axle

You always measure CV axle overall length compressed from both extreme ends. Here is the info that might help. There is NO one size fits all axle for all 3800 installs.
My 3800SC/4T65eHD powertrain is centered and uses two equal length CV axles. I forget the exact forumula that my axle shop used but the following may help.

CV Compressed Axle total lengths axle on bench, pushed together and measured end to end
Fiero Manual driver side 21"
1995 Beretta (all trans) 20 1/4" drivers side 21 1/4" passenger side
(1995 Corsica also uses the same axles)
1995 TranSport auto 20 1/4 " drivers side 23.3/8" Passenger side
1998 Lumina 3.8 (auto) 20 3/8" driver side
1998-up Grand Prix Drivers (auto) 21 7/8" drivers side
2002-2004 Cavalier (auto) 21 3/16: drivers side.

By the chart I assume that the 1995 TranSport or Lumina axles should be the ones used if you center your powertrain and change the outer CV joint to Fiero manual units and the inner passenger side to the GTP tripot.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

Thanks Dennis. Whats most people using for legnth? I have a offer for a 25.5 axle.