4-speed muncie sm420 manual

P7a14 muncie 1967, jan 14 muncies assembly codes are model year. My truck is a 1970 chevrolet c20 dump truck, it is a super great truck, very easy to drive with this essentially 3 speed granny gear transmission. The muncie 4 speed,was first designed in 1963,and lasted until 1974. Does anyone have a hard copy and willing to mail me. Muncie sm420 4 speed chevy gm heavy duty truck manual.

It was a stout 4 speed transmission that could handle heavy abuse, and most importantly it had an ultralow granny gear ideal for the low speeds needed for a strenuous agricultural life. Sm465 4 speed manual transmissions midwest transmission. General motors 19631974 general motors high performance auto gear equipment 530 state fair boulevard, syracuse, new york 204 800 6343001, inside new york. The muncie case 3831704 replaced the t10 4speed in the 1963 chevrolet bel air and corvette by midmay of that year. Muncie sm420 manual transmission overhaul kit these quality sm420 manual transmission parts, rebuild kits and overhaul kits are designed to be top of the line overhaul kits.

I am planning to rebuild my sm420 tranny in my 57 6400. Gm original shifter handles 4 speed conversions gm manual. This is the gm muncie sm465 4 speed manual for gm trucks in production from 19681995. The sm420 is an impressive, heavyduty truck transmission designed for and used in. However, i had an sm420 in an 87 fs blazer and this is an older cousin to the sm465. Performance built muncie sm465 4 speed transmission. Muncie 4 speed transmission parts rebuilt manual transmission. Sm420 4 speed manual transmission granny gear auto parts. The muncie sm420 4 speed manual transmission is a very compact, heavyduty 4 speed manual transmission that is synchronized in 2nd, 3rd, and 4th gears. Bearing retainer snout has no weep hole at 6 oclock, input seal is neoprene. Borg warner transmissions are covered in this section sm420 s, rear wheel drive rwd, requiring 4 speed applications. I have tried downloading a couple of manuals with no success. Allstate gear stocks a full line of manual transmission rebuild kits and transfer case parts at wholesale pricing. The sm420 was made by general motors from 1947 to 1967.

The large cast iron case with large bulge on the passenger sidemakes it easy to identify. Muncie sm420 4speed manual used up to 1967, very similar to sm 465 except small changes to gear ratios and location of reverse. From short tracks to drag strips and car shows to museums, the muncie transmission can be found in a variety of vehicles. Diagram shows the parts and basic workings of a gm muncie 4speed. I found out thru other postings that a 7 digit casting number beginning with 37,38 or 39 fall in the 196467 year time frame. Using the links below, you can view or download scanned images, in. He explained that the mineral oil based gear lubricant had a higher level of ash which in turn caused these synchonizers to slow and engage as designed, thus eliminating double clutching. Other muscle car transmissions of that era, such as the ford toploader and mopar a833, left no room for improvements because of the layout and initial design of their.

The close ratio gear box,gives you a fairly high first gear,with the rest of the gears fairly close together,for less rpm drop on your top end. She is riding high, rolling on 35 inch falken wild peak at tires. We have include information on how to identify individual transmissions, application information, model year, detailed kit and part availablity by transmission type. Gm manual transmissions gear vendor overdrive gmc 2wheel. Mar 02, 2015 the muncie 4speed was gms answer to the t10, and by mid 1962 full working prototypes had been built. P8r23 is assembled oct 23, 1967 for 1968 model year. The sm465 can be found in chevrolet and gmc fullsize trucks, blazers, suburbans, among other models. The novak guide to the gm muncie sm465 transmission. Sm420 transmission bearing and seal kit 4 speed manual trans usa standard gear.

Muncie truck sm420 series, 4 speed transmission paper gasket set. Milder gm cars used saginaw or borgwarner fourspeeds. The novak guide to the gm muncie sm420 transmission. The 4speed design of the t10 and muncie is a very forward design.

Up for sale, good used muncie sm420 4 speed transmission with rare emergency parking brake option. Just about everything that can be new on this truck, is new. Gms muncie sm465 manual transmission, used in lightduty and mediumduty gm trucks and suvs from 19681991, has long been favored by offroad drivers for its low, low first gear that makes it ideal for rock crawling. I found that i could cut the shift times in half or better by pushing in the clutch about a 12 second before i let off the gas. These quality sm420 manual transmission parts, rebuild kits and overhaul kits are designed to be top of the line overhaul kits. Military specification versions were made through the early 1980s. One even downloaded some unwanted programs on my computer. Guide to muncie m20, m21, and m22 fourspeed transmissions.

In 1947 general motors pickup trucks received a transmission that rural america was anxious to receive. Having issues diagnosing problems with your sm465 gm 4 speed manual transmission we can help. This raised the rpms slightly and i could get it to shift pretty darn quickly. I will concentrate on 4 speed shifters, although the 3 speed versions were very similar. Muncie sm420 transmission gm 4 speed gmc for sale online ebay. Muncie fourspeed manual transmissions came in many gm models of the 60s and 70s. Muncie sm420 4speed manual transmission chevy 19471972 w.

Introduction to rebuilding gmmuncie 4speed transmissions. Rebuilt for chevrolet blazer, suburban, s10, c20, c30, gmc, jimmy, 1500, 2500, 3500, and vans. Sep 24, 2011 muncie sm420 manual transmissions 4 speed. Some muncie parts are very valuable to corvette collectors, so check each ones rarity before putting one on your hot rod. The kit i am planning to buy does not come with instructions. I created this mod because i wanted to simulate the way my truck drives in beamng. You could also tell the year by the code above the casting number. Corvettes saw installation by may through june of 1963.

The short case, robust construction, widespread availability and low first gear make this transmission popular for offroad projects. There is a small section of video that has no sound due to the artist no longer honor. Manual transmission repair parts online sm420 4 speed. Muncie 4 speed transmission repair fixing a poor rebuild. Muncie sm420 manual transmissions 4 speed repair parts. It replaced the t10 in general motors cars, starting in february of 1963. He told me that gm used this mineral based gear lubricant up until the midseventies, even in the muncie m21 and m22 4 speed transmissions. Under the hood is a gm 350ci v8 connected to a muncie sm420 4speed manual transmission. I bought a 4 speed sm420 transmission without knowing the year but had some idea. Please see my other auction items and give us a call at 3607350753 or email. A muncie transmission differs from a saginaw transmission in that its reverse lever is in the tail. The sm420 is the older heavy duty, granny, 4 speed transmission used in chevy and gm trucks. Has a new 3rd gear and it also has new bearings and gaskets all the way around. We offer a complete line of muncie sm420 manual transmission parts and overhaul kits to help you with chevrolet or gmc 4 speed manual transmission.

Rebuilt muncie sm420 4 speed transmission for sale. Below you will find a detailed parts list for the sm465 manual transmission that includes complete rebuilt transmissions, bearing rebuild kits with and without synchro rings, seals, small parts kits, bushings, individual bearings, hub slider, synchro rings, forks, gears and shafts. It is an excellent 4 speed to swap into a jeep with a chevy or buick engine. The sm420 is a heavy duty, 4 speed manual truck transmission used between 1947 and 1967 in. Muncie general motors 4speed longitudinal transmissions were developed in three distinct models the muncie m20 wide ratio manual transmission, the muncie m21 close ratio manual transmission and the muncie m22 heavyduty close ratio manual transmission. Im not an expert on gm manual transmission floor shifters and im educating myself by researching parts books, assembly manuals, reading the experts material and collecting shifters. Hard shifting and gear noise existed after what seemed like a good rebuild. See final drive ratios and notice continue reading gm truck manual. Whether it was a series of lucky choices, or happy accidents, the 1957 design allowed for improvements. New process gear np435 4speed longitudinal transmission used in a select handful of 6772 gm pickups. Muncie sm420 transmission specs, tech, and gear ratios.

Beta gm muncie sm465 4 speed manual transmission for d. Aug 07, 2018 the summit performance 4speed shifter pn sum700040 is a bolton swap designed to fit your muncie. The t10 front bearing size was reduced in diameter in 1963 only. Gm gmc chevy pickup truck muncie sm420 4 speed 4spd spd. Paul cangialosi shares some of his muncie 4 speed rebuild upgrade tips. This meant that the transmissions front bearing retainer and register bore of the bellhousing were also smaller in diameter.