How To Change Manual Transmission Fluid 1968-1991 Chevy & GMC Pickup | Muncie SM465

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Easy step by step instructions for changing the fluid in your Muncie SM465 manual transmission, and lots of useful tech tips as well! The Muncie SM465 manual transmission was used in all GM light and medium duty trucks between 1968-1991, and is a heavy duty 4 speed transmission.
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28 июн 2024

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Комментарии : 68

@bigwood1627 3 года назад

Pulling the fill plug first is something I hadn't thought of and is a great tip!

@canadaoffroad1669 3 года назад

Worse case if you find yourself in that situation you can pull the shifter out of the top and fill it that way but hard to tell if you have the right amount in it. Get you by in a pinch tho

@lilmockme8821 2 года назад

just did mine, and used this tip. Great advise

@ericfinlay9734 Год назад

GL 4 80w90 is the manufacturer recommended lubricant

@BobVan 2 года назад

Supposedly GL-5 isn’t good for the synchromesh SM465. It has stuff that causes premature damage to yellow metals inside. The 80W-90 equivalent GL-4 or tranny (gear oil) thats designed for Synchro mesh gears is preferred. Valvoline Synchromesh MTF from Oreillys is what they recommend in my area. It’s what I’m using as well. Thanks for sharing!

@delbert9357 8 месяцев назад

Haynes manual says 80W GL5.

@coolguy2475 4 месяца назад

If its GL-5 with the MT-1 designator its safe to use with the brass synchros

@BobVan 4 месяца назад

@@coolguy2475 Yeah I did a little research and I also looked on Novak site and they said the same thing but almost all sources I looked into back then when I changed my oil recommended the stuff I mentioned above over the GL-5 because “API GL5 gear oil has higher levels of active sulfur phosphorous, which will corrode yellow metals” quoted from another site I seen it on. But It may only be an issue if you get the SM465 above normal operating temp. Probably fine with the 80W and or GL-5 (with the MT1 designator) but I wasn’t taking any chances.

@slobodanmilosevic3338 28 дней назад

Thumbs up and subbed, Proud square body squad member myself.

@dennisw8166 3 года назад

Thanks for the tip. I own a 76 GMC Sierra Grande. Guess I'm what's called a shade tree mechanic in learning. Love gaining new knowledge of how to maintain it. Subbed

@garrettwhite8943 3 года назад

Thanks, Guy! I am getting my granddads pickup running again so this really helps.

@TheCoupe06 3 года назад

This was a major help. Can't say enough for how much, since buying my '68 GMC C15 almost ten years ago. I've put a re-man straight-six, 250 CID in six months ago, but never thought about the transmission until it started sounding odd. Now I know why. 'Just hope I caught the problem in time. Thanks again.

@jonathanjackson1271 Год назад

Thank you I highly appreciate your video. I got an 88 Chevy Cheyenne with 33,470 miles as a project and looking to learn all I can.

@rickstride7269 3 года назад

great site, to the point, accurate info, good photography. well done

@rso2965 2 года назад

Super good video man, some of this stuff seems like it will be a pain so it gets put off, but this video just gave me the boost I need to get it done.

@ccfreedomseekerconstitutio8767 3 года назад

Appreciate your time and help 🆘

@1jjwilliams 3 года назад

This really helped me I just INHERITED this 1987 GMC S15 SIERRA TRUCK AND My inlaws drove this truck to and from California-Mexico 🇲🇽 and have never replaced the oil because they did know how. I have a feeling I'm in for some transmission issues although it runs good. Thank you for this great video.

@solomonchapa2352 3 года назад

Beautiful video, well done. Helped out a lot

@AdamGaron686 Год назад

Thanks thanks - I just got a manual square body and i couldn’t find the trans dip stick and I was all lost - makes sense now

@Mwellmac Год назад

@2:21 solid advice man.. you saved some people, myself included.

@username_unavaliable 2 года назад

Appreciate the breakdown. 81 c30. 👍

@Socoolral 3 года назад

Thanks for the advice and tutorial. I was having huge issues with my 85 GMC 4 speed transmission and what I thought was going to cost me well over two K, turned out to be zero fluid in the clutch master cylinder and very low transmission fluid.. Twenty three dollars and a few questions along with this video saved me an enormous amount of money. Thank you so much for putting this content out.

@mickeyalston2239 3 года назад

Did yours make a loud squealing noise without any fluid in it

@Socoolral 3 года назад

@@mickeyalston2239 It made some noise but for the most part it would make grinding when trying to put it I. Gear and it was nearly impossible to get it in gear. It would make a big clunk noise when Putting it in reverse (the only gear that seemed to work) but now it runs like new after filling up the master cylinder and manual pumping fluid into the transmission. It was surprisingly easy.

@kirkmanjames 2 года назад

Great video - Subscribed!

@stevensanderson1746 Год назад

Thanks for the video homie

@theamaturepro 9 месяцев назад

Hmm. Mine has 80,000 miles and it's been 35 years since the fluid was fresh. I guess I should think about doing this. lol

@brianmsith7979 Месяц назад

lucky it was a gm product, only a gm trans can live like that for so long

@csaiz8847 Год назад

Thanks for your video. I am about to do this to my 1981 C10 truck this weekend. Not sure if it has ever been changed.

@Nomadcreations 3 года назад

Thank You, MG, For a Fairly Obvious(No Offense/Desrespect meant) Visual With More Helpfull Details For easiness Of the Job. Yes VERY GOOD Point Make Sure The Fill Plug Is Loosenable, Assumable That It Would be But Rust Does Its Nasty Thing Especially On a Threaded Above a Lubricant level That gets Dry. Thanx For the Magnet Tip I Didn't Know It was there. Yes Tranmsission Fluid The Forgot about maintenance Detail. I Love Those 465's even Though Few do

@irracm 3 года назад

Thank you very much for the video!! exc!!

@lyonsculpture6577 2 года назад

thank you

@Livengoodproject 2 года назад

Thank you. My 5 speed stick is SO HARD to get into gear. Seems like this should help. I hope

@jimlovesgina 2 года назад

I would check the hydraulic clutch (master and slave cylinder, fluid etc).

@Asa-pg9kz 2 года назад

Thanks for the video! What’s the thought behind using such a heavy duty gear oil into the gear box? I just run dexron VI. Is there no concern that it won’t be able to cycle through properly? I use the same stuff for rear end dope on my 83 K10

@douglassmith6873 3 года назад

I having trouble figuring out how to remove the trans with the bellowing attached. But im stuck on how to remove the mechanical clutch from the bellowing

@wearemannamachine Год назад

My understanding is that you should use GL-4 oil instead of GL-5 because the GL-5 oil is corrosive to brass and most/all SM465's have brass bushings in them

@delbert9357 8 месяцев назад

The Haynes manual calls for 80w GL5.

@cristiansabetta1199 10 месяцев назад

Gracias!!!

@AdamGaron686 Год назад

Yes please

@mikeneff832 2 года назад

Just started to watch this video. Currently walking home. I have a 76’ C10 with a 3 speed Saginaw. Does this work for all applications or just with the 4 speed in this 77’ ? I am about to install this 465 in the near future but for a couple weeks I’m gonna run the 3 speed because I know it works but I’ve drained it and pulled the driveshaft thus far. Thanks in advance!

@951paintball 2 года назад

Is it the same process for the transfer case?

@verteup Год назад

Any idea how to find the drain plug on a 1978 Chevy 3 speed on the column manual transmission? It's has a fill plug halfway up the passenger side but no drain plug I can see. Any help would be tremendous.

@scottmcmunn5369 2 года назад

How do you check k the fluid level?

@308scoutrfl Год назад

Much easier to pull the shifter to fill it back up

@AdamCanFly 4 месяца назад

Thanks for the info! Just did mine and t he old stuff that came out looked like a frosty from Wendy's!

@user-fp3zh5ps9u 6 месяцев назад

I have a 93 Silverado pickup 6 cylinder when I'm going and I step on the gas it pops and hesitates to gain power what can I do about

@user-bh3by5gg6v 2 месяца назад

I have a 1978 Chevy c60 split axel 5or10 speed manual, I think. I just got it I'm trying to get any info from (exp people) flatbed truck with 9.00-20 size tires... Is there anything different in regards to the gear oil type? Also does anyone know the gearoil capacity?

@user-bh3by5gg6v 2 месяца назад

Oh and does anyone know how to identify the transmission type in my 1978 c60 manual trans??

@realeztreeservice9152 3 года назад

I have a comment. Great video but can you call the dealership service dept in Utica NY and tell them what kind of oil to use? They couldn't tell me...lol.

@quincybaus9409 2 года назад

do you by chance know what type of oil the T case uses

@ChauncyFatsack 2 года назад

Gear oil or sometimes 30 weight engine oil!

@BiffClark17 4 года назад

can you open the fill hole, then fill it from the shifter hole and just watch untill it flows out of the fill hole?

@joeloughmiller2189 3 года назад

Yes. Just did it with one while changing a clutch.

@jakemyers1030 3 года назад

Yeah. Pumping the "honey" from the ground is for the birds.

@thenexthobby 3 года назад

Or just put a gallon in and call it done. If you're slightly over or under it won't matter either way, and no SM465 should really be appreciably different than 1 gallon. It also gives an opportunity to inspect your shifter, which is probably loose and needing a modification and/or new O-rings to firm up anyway.

@mikeholmes8723 Год назад

My transmission won't go in to 3- 4th gear been seating for awhile years it was fine when I stopped driving it

@jongass7799 3 года назад

I currently have a 91 gmc sierra its a 4.3 with manual it recently got stuck in reverse on me and I can not get the stick out of reverse but what's getting me is it will not even back up and I do not want to force it any tips or advice thanks

@lilmockme8821 2 года назад

you will have to drop the transmission, most likely a bearing failure

@lilmockme8821 2 года назад

if not, transmission failure, because of lack of fluid

@tylerbuilt_chevy_tough5163 Год назад

I heard gl5 isn't good that it's corrosive on the brass internals i heard gl4 is better on the brass internals is that true? Or just a myth because I guess the g4 is a none corrosive?

@delbert9357 8 месяцев назад

Haynes manual says 80w GL5