automatic to manual transmission?

[Frank Mehaffey]

I have a 1990 GMCS15 Sierra Classic with a recently rebuilt Tech 4. I am interested in putting in a 4,5, or 6 speed manual transmission in to replace the automatic with overdrive originally installed. Does anybody have any idea of what I should look for in a manual swap and what would work? Thanks for any help.

[Jglew82]

There are a few guys over on gmt400.com that have done NV4500 and NV3500 swaps. Head over there and use the search. Lots of good info about what you need. 

[Niners 365]

Thats alot to swap, perhaps consider marrying up a newer auto tranny that has 5 and 6 speeds in them. The manuals, you have to put in clutch pedal, all the hardware as well as tranny. Not sure if you want to dive into a pretty expensive swap?

[Scotty V]

Frank,

I would head to the Junkyards, there are still plenty of those trucks around with the manual transmissions, grab everything you need.

The 1990 S-trucks had 5 speeds i'm just not sure which one.

Good Luck

[gmcdawg]

They had a T5, tons of info on the net about those.  And I agree, so many of these S trucks still out there, I would find a manual truck to build or piece together the best parts from both if a manual is wanted.