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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: necromonger on March 02, 2009, 06:36:25 pm

Title: my sm 465
Post by: necromonger on March 02, 2009, 06:36:25 pm

hello all,i have a Sm 465 i am putting in my 83 gmc 3\4 ton 2wd.now here is the question how can i tell what year this tranny is?

Title: Re: my sm 465
Post by: Captkaos on March 02, 2009, 08:33:30 pm

4x4 specific, visual inspection
69-78 has a 10 spline output (figure 8 mounting)
79-91 has a 32 spline output (round 6 bolt mounting)
There was a C/K (new bodystyle) 88-91 version that was the same as the 79-91, but they had aluminum top covers

Title: Re: my sm 465
Post by: Prong on March 03, 2009, 06:04:37 am

I thought the 32 spline units didn't come along till the early/mid 80's?

Title: Re: my sm 465
Post by: Blazin on March 03, 2009, 06:54:27 am

I thought it was with the body style change in 81. Never dug into the years for them that deep though.

Title: Re: my sm 465
Post by: necromonger on March 03, 2009, 10:13:55 am

thank's my top cover is cast iron going to put new seals in today front and rear so the rear splines will tell me about what year.thanks a bunch.

Title: Re: my sm 465
Post by: Captkaos on March 03, 2009, 11:15:41 am

Nope, it was 78 when it changed.

ONLY new Body style C/K's had the aluminum top...

Title: Re: my sm 465
Post by: necromonger on March 03, 2009, 03:58:06 pm

also can i run 50wt oil in this tranny with no problems?

Title: Re: my sm 465
Post by: Captkaos on March 03, 2009, 05:00:43 pm

50W gear oil yes.