All tranny shafts are 24 spline/1" diameter. The only difference is the clutch diameter, either 8" or 8-1/2" for the MSG4/5, each has a different bolt pattern to attach to the flywheel, so the flywheel must match. Unless your truck has had the later 8-1/2" flywheel & clutch swapped in you have the standard 8" clutch & flywheel that came with the truck. The 8-1/2" clutch first appeared in 1980 4x4s, so it didn't get installed with the original Low 4x4 kit. The only way to tell which clutch you have is to measure the diameter, so I would buy the 8" clutch kit locally, pull the tranny & measure, then if you do have the larger clutch return the 8" & swap. This is one of those instances when paying a bit more for local parts is an advantage. An upgrade option would be to buy the larger clutch kit and a matching flywheel, the only problem is sourcing the flywheel. Every parts supplier I have seen lists the wrong flywheel, they list the 8-bolt flywheel for a 4ZDI/C1 2.3/2.0 turbo engine but the correct part is the 6-bolt flywheel for the '80-'82 G180Z 4x4 only version or any version of the '83-'87 G200Z. The 8-bolt flywheel will not fit your crank, no matter what the supplier claims. Best bet for the larger flywheel is a salvage yard, but JLEMOND had new ones at one time, I bought one for about $125.
_________________ '78 Chevy LUV,1.9,4sp,headers,31's,SAS Dana 30,Dana 20,SOA rear w/Aussie Locker, rough body, bought new 12/4/78. '87 Trooper,2.3,5sp,headers,31's,ball joint flip & spacer,Aussie Locker rear,Superwinch hubs,brush guard w/5.5K winch,more to come.
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