Stock 350 3/4 ton transmission options

[AC89K2500]

Hey Everyone, my name is Ashton from Iowa. I recently acquired a fairly clean ‘89 3/4 ton Chevy with a stock 350 small block. It currently has the 3 speed manual which I find to be horrendous for anything above 55mph. I’m looking into the idea of a 4l80 swap and was wondering if anyone has a list of parts I’ll need to replace in order to make this happen. This is just a project truck so I’ve got all the time in the world to trace parts, I’m just trying to come up with a game plan in advance so when I get to that point there are few/no surprises. Any help is greatly appreciated. Thanks in advance!

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[NickTransmissions]

Hi Ashton,

Welcome to the forum.

Check out the below threads if you havent already done so

4L80 swap tips and tricks.

Hey all, about to complete (have competed!!!!!!!!!!!!!) my 80 swap into my 96 k1500, 5.7L, 0411 swapped truck. I wanted to cover some of the things I ran into while doing the swap and maybe shed some light on issues y'all might run into during this undertaking. Also, going to try and throw in...

www.gmt400.com

4L80E Information Thread

Starting a 4L80E information thread for those that want to learn more about these transmissions, how to service them, overhaul them or considering it for a swap into a GMT400 series truck, Squarebody or anything for that matter. These are the best longitudinal automatic transmission GM ever...

www.gmt400.com

Let us know if you have any questions.

 

[Sean Buick 76]

I would find a junkyard truck to poach the trans, t case and both driveshafts from. Then I would have a pro rebuild the trans and then look at the standalone trans controllers.

 

[b454rat]

Too bad weren't closer, I have 95 NV4500 that im gonna sell....be better than an auto

 

[Scooterwrench]

You say it's horrendous above 55,what about a gear ratio change? I didn't know they were still installing 3spd's in '89.

 

[fancyTBI]

Too bad weren't closer, I have 95 NV4500 that im gonna sell....be better than an auto

What, do you just have a pile of cool shít out there?

 

[99xcss4]

You say it's horrendous above 55,what about a gear ratio change? I didn't know they were still installing 3spd's in '89.

I do not think there were any more 3 speed manuals left I would bet that the the truck in question is a 4 speed sm465 and that the shift knob has L123 or L234 maybe have seen some that only that were printed 1234 but do not know if any left the factory or if those were aftermarket from the gmt400 wikipedia page

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[99xcss4]

to the op if you actually have a ms465 I keep it is a great transmission nearly bullet proof and very strong can take just about any thing you can through at it is a heavy duty transmission and shifts like one and acts like it is not like a m22 rock/stone crusher that you bang shift personally the only reason I would get rid of a sm465 is to replace it with another one or upgrade to a early nv4500

 

[b454rat]

What, do you just have a pile of cool shít out there?

lol, just right place at the right time.

 

[Scooterwrench]

Three speeds were used until 1980. No listing for them after that.