Variations

[gst4g64]

I was wondering what are the build dates of these variations:

18 Spline Vs 25 Spline
5 Speed Vs 6 Speed
Cast Vs Forged Crank
OBD I Vs OBD II
2 Bolt Main Vs 4 Bolt Main

Thanks

[MaxClass]

Cast cranks were in '91 and '92 year models as were 2 Bolt Mains. Forged cranks started in '93 with 4 Bolt Mains. Not sure of the build dates though.

Full OBD II took over with all 1996 models. Word is there were some Hybrids around 1994-5 but someone else will have to chime in on that.

[stealthee]

5 speed was 91-93 and 6 speed was 94-99.

OBD1 was 91-93, OBD2 was 96-99, 94-95 was a hybrid of the two.

[amicus]

I think they went to the 25 spline sometime during the latter part of the '92 model.

[GTOJOE]

don't forget small bearing vs big bearing.