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Does anybody know what the correct transmission casting number should be for a 1934 Master? I have a 590715 that I got with one 1934 chassis. I have a 590695 that I purchased as a correct trans & I have a 590532 that I got with some other 1934 stuff. I saw a chart on here some years ago but can't find it now. Can somebody please help? Thank you, Joe
See America's First...Chevrolet
1931 Sedan Delivery 31570
1933 Standard Sports Coupe 33628.
1934 Master Sedan Delivery Canadian 177/34570
1968 Z/28 Camaro
1969 SS 396 Camaro
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Technical Advisor ChatMaster - 10,000
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4.103 CASE, TRANSMISSION 29-30 590391 353300 31 590452 590451 31 4 speed 590456 590455 31-47 4 speed ex LT 590474 590524 32-36 ex CC DC 590532 590531 33-34 CC DC p/n 473207 34-36 DA EA 590695 590697 35 4 speed (WT) 476187 4.105 COVER - CASE, TRANSMISSION 29-31 590281 590280 29-31 4 speed 590369 352323 32-36 590591 363840 35 (WM) p/n 601421 36 (WM) p/n 602135  
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Both of mine are 590695 however the numbers lower say GM - 4 on one transmission and GM - 1 on the other whatever that means. GM - 4 came from the sport sedan and GM - 1 came from the rodded coach.
Best Regards, Pat
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Thanks for all the information. Looks like I have one for sure that is usable. I wonder where the 590715 came from...Joe
See America's First...Chevrolet
1931 Sedan Delivery 31570
1933 Standard Sports Coupe 33628.
1934 Master Sedan Delivery Canadian 177/34570
1968 Z/28 Camaro
1969 SS 396 Camaro
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Joined: Jan 2002
Posts: 1,869
ChatMaster - 1,500
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Joe, I tested the wiper motor this morning with thye vacuum off my truck's power brake. Works fine. Thanks again.
Best Regards, Pat
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You also want to look at your casting dates...
Also the GM was first used in 34 on castings and the GM - 4 and GM - 1 are the cavity numbers most likely.
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Backyard Mechanic
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Backyard Mechanic
Joined: Nov 2004
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The 590715 was used in the 1936 GMC T-14. I have also been told that this transmission was used in the early 40's Chevrolet trucks due to GM having a bunch left over.
1936 GMC T-14 low cab. TA for 1935-37 GMC, Director of the Gulf Coast Region
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ChatMaster - 25,000
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That transmission was used from 1932-1936 in the Master passenger cars and trucks with a 3 speed. It was never used after 1936 as the new smaller, lighter, more simplified 3 speed took its place in 1937. Various changes were made the first two years. In 1936 the speedometer fitting was raised up higher to prevent gear oil leakage at this point.
Gene Schneider
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Thanks for everybody's input. This will help me get it sorted out...Joe
See America's First...Chevrolet
1931 Sedan Delivery 31570
1933 Standard Sports Coupe 33628.
1934 Master Sedan Delivery Canadian 177/34570
1968 Z/28 Camaro
1969 SS 396 Camaro
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Joined: May 2015
Posts: 1
Grease Monkey
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Grease Monkey
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did you find a repair manual for the 590532. I have one also and it is locked up could use a little help Morey
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Joe,
I have had the same '36 PU since 1965 and have had all 3 of those transmissions in my home shop during that time. I'm not an "Expert" but I've actually had them side by side for comparison. Here's what I've observed.
The 590695 was in '34-'36 Master cars. It will work in cars only because the '34-'36 PU has the master cylinder/pedal assy bolted to the left side of the transmission and the e-brake bolted to the right side of the transmission. The 590695 has nothing for these bolts to thread into.
The 590532 and 590715 are the same casting except the 590532 is machined to mate with a free wheeling unit. Both of these casting numbers have lugs cast on the sides with 3/8" - 16 tpi threads to support the MC/pedals and the e-brake. These will work in both cars and pickups. In cars the threaded lugs on the sides of the case are simply not used.
If you or anyone else has figured out how to get a smooth 2-3 shift out of these transmissions or what the oil options are other than "600" steam cylinder oil I would be grateful for your information.
I have 2 of these transmissions that I have used in my '36 PU and they both behave the same. They both have new 2nd and 3rd gear synchronizers shimmed to the middle of the specified 0.025"-0.035" end play. The both were filled with various oils including 600. With 600 they both shift beautifully when the oil is cold but the 2-3 shift is not smooth once the oil is hot. This suggests thicker oil would be a solution.
The basic causes of the problem seem to be that the 3rd gear synchronizer is smaller than the 2nd gear synchronizer so it doesn't have the same friction area to synchronize the 3rd gear and the sliding "clutch sleeve" and the unavailability of the 160 viscosity oil originally used in these boxes.
If anyone has found a cure other than machining concentric grooves in the 3rd gear synchronizer brass I'd really appreciate hearing from you. My email is raywaldbaum@gmail.com.
Ray W
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My 1936 Truck still has the trans. oil in it from before 1954. The original owner bought it in 1936 new. As his "personnel truck" that he used at the Texaco Service Station in Bandera, Texas. I am the second owner. It has always shifted smoothly but I have always needed to pause in neutral for a second before going into the next gear. It will not just shift straight in, Much less "Power Shift" to the next gear.
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