Sm465 gear oil

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GM Muncie SM465 Transmission

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The Novak Guide to the

The SM-465 or CH-465 Transmission

For a video version of this article, click here

The SM465 is an outstanding, heavy-duty truck transmission designed and used in ½, 3/4 and 1+ ton trucks. The SM465 was made by General Motors from 1968 to 1991. They are found primarily in GM and Chevrolet trucks, Blazers, Suburbans and many other models falling under the 1/4-ton to 1-1/2-ton platforms.

The 465 is an intellegently designed and very well-built transmission and remains easy to locate and generally inexpensive to buy and maintain. The strength, relatively short size and the gearing of the transmission make it a good choice for a variety of on-road and off-road situations. It has a very good set of road manners contrasted by its enormous off-road brawn.

The "SM" in the transmission's designation stands for Synchro-Mesh, in the tradition of other GM gearboxes. It is also referred to as the CH-465 or CH465 by factory literature.

Identification

sm465_specsThe SM465 is a top loaded, top shifting truck style transmission. This transmission is 12 " long and features a cast iron top cover that is retained by eight bolts. The SM465 case is of cast iron. The case itself is generously ribbed both vertically and horizontally.

The SM465 has a 1-1/8" diameter, ten spline input shaft that has a stick-out of 6-1/2" from the front face of the transmission. The pilot tip is ~19/32" in diameter. The front bearing retainer flange measures an unusually large 5-1/8" in diameter and the bearing retainer tube is 1-3/8" in diameter. The front bolt pattern is the consistent GM Muncie / Saginaw four-bolt pattern as found on GM bellhousings and transmissions from the 1940's through the 1990's.

Features

The SM465 enjoys a very low compound gear at 6.55:1 and as such it is a popular choice for those wanting a low crawling gear.

The SM465 features power-take-off (PTO) ports on the passenger and driver sides of the case.

The 465 is synchronized in the 2nd through 4th gears, however 1st gear and reverse are not synchronized as one typically only engages these gears from a stop.

The shifting pattern for the 465 is in the standard "H" pattern with reverse gear being to the right side, and down.

SM465 Versions

There are three principal versions of the SM465, each based on the era and configuration of the transmission. There is no known mechanical superiorities to either earlier or later versions.

Spline Misunderstandings Clarified

"More splines are stronger"

Not necessarily. Larger shaft diameters are stronger, and larger shaft diameters usually require a higher quantity of splines. However, the automotive powertrain industries migrated to more splines on shafts due to their ease (speed, cost, etc.) of manufacture - smaller splines being able to be roll forged instead of the larger splines having to be machine cut.

A 32 spline output shaft vs. a 10 spline spline output shaft is probably only minutely stronger, and a decision of use here should be driven more by compatibility than perceived strength.

Earlier SM465

The earlier era of the SM465 include the 1968 - 1978 transmissions. There were both 2wd and 4wd versions. Internally, they are identical to each with the exception of the transmission mainshaft. The 4wd version of this mainshaft (or "output shaft") has a 10-spline output with a 2-5/8" stickout and an accompanying 4wd adapter housing. The 2wd version has a 35-spline threaded mainshaft compatible with a driveshaft yoke, and accompanying 2wd style tailhousing.

Later SM465

The later era of the SM465 include the 1979 - 1991 transmissions. A minor internal change of the 1st gear bushing and thrust washer occurred, in addition to a change from a shorter 10-spline, 4wd output shaft to a 32-spline 4wd output shaft - coinciding with the change of bolt pattern in the New Process 205 transfer case from a figure "8" input bolt pattern to a round, six-bolt input pattern. This pattern was also found on the 208 and 241 chain-driven transfer cases.

Later 2wd style SM465's also incorporated the same 1st gear bushing and thrust washer change, but the 35-spline, yoked output remained identical.

1988-1991 Versions

The last years of SM465 featured a direct-drive (4th gear) switch to signal a lean or cruise mode operation to the GM Engine Control Module (ECM). These final versions had an aluminum top cover and a revised input shaft and input bearing combination. They were found in the C/K Series trucks. Suburbans, however, continued to use the earlier SM465 with the cast iron top cover.

Incidentally, this later version of the SM465 was available under GM #12345577.

sm465_mainshaft_tails_closeup_array

Transfer Case Adaptability

This transmission makes an excellent conversion transmission due to its adaptability into most Jeeps. Both 2wd and 4wd versions of the SM465 can be used equally well, and there are no inherent advantages to either one once you have installed our adapter assembly.

The Muncie 465 can be adapted to the popular Jeep (and many IH) transfer cases, including the:

sm465_with_463_adapter_rear_quarter_view

A turn-key SM465, professionally built, adapted or OEM style and delivered to your door - ready for a variety of engines and Jeep transfer cases. Read more...

Engine Compatibility and Adaptability

chevy_bellGM

As the reader will conclude, the Chevrolet and General Motors SM465 will marry directly to a GM style bellhousing. This includes Chevy car, Buick, Oldsmobile and Pontiac bellhousings. However, since this transmission has such a large bearing retainer, the car size bellhousing bore is smaller than the transmission's input bearing retainer. If you need to join this transmission to a GM bellhousing with the 4-11/16” bore, it can be done. The bore must be opened up to 5.000” and the retainer turned down to 4.995” as precision slip-fit. We can perform this service with a very quick turnaround, or you may have it done by a good machine shop local to you. We also sell new bearing retainers turned to the dimension you require.


AMC Jeep

AMC_bell_to_sm465_in_machining_center

The 465 may also be made to be compatible with AMC bellhousings. This modification has primarily been developed for conversions replacing the SR4, T4 and T5 Jeep® transmission as used in 1980-1986 CJ vehicles. 1972-1979 AMC 232, 258 I6 and all 304, 360 and 401 V8 engines can also be used with this transmission but must be equipped with a bellhousing, release arm, release bearing, and clutch disc from a 1980-1986 6-cylinder CJ. Our Kit #465-AMC can be purchased to simplify this process.

The 4.0L Jeep I6 (both Renix and Mopar systems) is adaptable using the same method as above, with the addition of installing a Crank Position Sensor (CPS) into the aforementioned bellhousing. This is a service that we provide affordably and in quick turnaround.

Rebuilding the SM465 

The SM465 is relatively simple to rebuild. Many shadetree mechanics do very outstanding rebuilds if they have access to a press, snap ring pliers and bearing pullers. Many choose to do a full rebuild during the adaptation process, and our instruction guides feature all the details, diagrams, pics and tricks required to do professional level work.

For your information, a few Muncie 465 casting numbers include:

3871912, 3901127, 673212, 6273212, 3901131, 465453, 8672267, 867287 (aluminum top cover model)

sm465_parts

About the SM465

When filling your 465 with gear oil, we recommend that you select a conventional mineral oil or a para-synthetic in lieu of a full synthetic oil. Properly assembled manual gearboxes do not have the thermal strains seen by combustion engines or hypoid gears. Synthetic fluid in these gearboxes, while not harmful, is probably an economic waste.

Hypoid gear oil is sulphurized higher than transmission oil and can be mildly corrosive to the non-ferrous alloys used for synchros, bushings and thrust washers in these transmissions.

An 80W-90, API-GL5 or MT-1 rated fluid is very good. Some claim faster shifts from using a 50W engine oil in their transmission and we do not consider this to be contraindicated unless you operate your vehicle in a very warm environment.

Please enjoy our video version of this article.

Sours: https://www.novak-adapt.com/knowledge/transmissions/manual/sm465/

What fluid to used in your manual transmission

Oil Chart Manual Transmission

Wondering what fluid to used in your manual transmission?  redline manual transmission fluid Below find the answer to what fluid do I need.

It is important to use the correct fluid oil in you manual transmission, the vehicle manufacturers have done extensive testing to specify the correct fluid.  The oil is designed to reduce friction and provide necessary cooling. Information is provide for most vehicles.

If your transmission is not leaking we recommended that it be checked at each oil change and topped off.  Beware that vibration caused by "out of balance" drive shafts can damage rear seals in both the transmission and transfer case, causing fluid leaks and ultimate damage to bearings and other critical parts.

We recommend Red Line Synthetic fluid with improved fluid characteristics, increased bearing and component life as well as reducing the operation noise level.

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Sours: https://www.drivetrain.com/parts-catalog/manual-transmission-rebuild-kits-and-parts/what-fluid-to-used-in-your-manual-transmission
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Which lube works best with a SM465?

Don't be so quick to shitcan that SM465. If you can stand to have it sit around a while, you can sell it for a few bucks. Also remember yours is most likely a fairly uncommon variant of it; should have an aluminum top cover and an extra switch - that switch was for the TBI trucks that signalled the ECM to go into a lean mode for fuel economy when you're in 4th gear (man I hope I'm remembering all that correctly.)

If you're hunting an NV4500 for a swap just be careful what you buy. If you can't test it, assume it needs a rebuild. There are a couple known weak links in them...and one of them are owners that will do anything to not spend $100+ on the correct fluid for it. ;)If you can test it, watch for ANY grinding between gears. It won't be as simple as just replacing some synchros. You'll probably be into it for a full rebuild as the chunks will have torn up the bearings and such...expect to spend up to a grand making it right. AND...since New Venture has been out of business for a while, those fancy carbon fiber synchros are no longer available, so you go with aftermarket bronze/brass/whatever, so you lose some of that magical shift feel. Which I guess also means you'd no longer need the expensive fluid and could run anybody's synthetic lube as long as it matched the viscosity and other additive requirements (I'll assume GL4 so it doesn't attack the yellow metals.)

Richard

 

Sours: https://www.gmt400.com/threads/which-lube-works-best-with-a-sm465.35200/
How To Change Manual Transmission Fluid 1968-1991 Chevy \u0026 GMC Pickup - Muncie SM465

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Join Date: Feb 2003

Location: Santa Ana, CA

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SM465 Oil Type - Yes it Makes a Diffference


Just wanted to share my experience with using different types of gear oil in my SM465.

Got my SM465 professionally rebuilt by very reputable shop (Anaheim Gear in SoCal) about a year ago. They did all the little tricks to improve the detents, and to improve shifting. I installed it and filled it with 80W-90 Hypoid gear oil with GL4 and GL5 rating (before I recently learned that oils with GL5 rating are mildly corrosive to yellow metals such as the brass synchros in the SM465). The tranny shifted great for the past year until it recently began acting like the synchros were not working properly. Shifting was getting harder and it was wanting to grind during shifts at times. Long story short, I drained the old oil out, removed top cover and side inspection cover to take a look at the synchros. The oil looked good (a little dirty but no brass dust, shavings, or chunks), and the synchros looked good. I had to look long and hard, but finally found a 85W-90 gear oil that was only rated GL 4. It actually stated on the side of the bottle that it was not corrosive to brass! Filled the tranny with this oil and my shifting issues immediately went away. It now shifts much smoother, like when it was just rebuilt. This is just my personal experience, but it seems to support the fact that this tranny is intended for GL 4 rated oil, and that GL 5 rated oils can cause problems. Hope this helps someone out.

Sours: https://67-72chevytrucks.com/vboard/showthread.php?t=748768

Gear oil sm465

Muncie SM465 4 Speed Transmission

Transmission:

Muncie SM465

Type:

4 speed manual transmission

Manufacturer:

General Motors

Applications:

1968 - 1991 Chevrolet/GMC pickups, Blazers, and Suburban,
1982 - 1991 6.2L GM diesel equipped trucks

Synchronized:

Synchronized in all forward gears and reverse

Case Material:

Cast iron case & top cover

Case Length:

12.00"

Input Shaft:

1 1/8" 10 spline input shaft, 6.5" stick-out

Max Input Torque:

465 lb-ft

Output Shaft:

• Early 4WD - 10 spline
• Early 2WD - 35 spline
• Late 4WD - 32 spline
• Late 2WD - 35 spline

Weight:

~ 175 lbs

Fluid Type/Spec:

50W or 80W-90 non-hypoid gear oil
Recommend Amsoil Severe gear 80W-90 full synthetic gear oil

Identification:

Top loading transmission, early style had a cast iron top cover, while the later model had an aluminum top cover (both had a cast iron case). Standard H shift pattern with reverse toward the passenger and down. Trans has passenger and driver side PTO provisions.

SM465 transmission top cover bolt pattern
Sours: https://www.dieselhub.com/trans/sm465.html
465 Muncie transmission

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