VCCA Home Forums TECHNICAL - 1945 AND EARLIER 1933-1936 Rig and Pinon

I cam across what I believe to be a new ring and pinon for a 36. The note says it is was for a 36 and it was a 3.55 ratio. The tooth count is 11/42 so it cant be a 3.55. What ratio did they use on the 36?

The 1936 Master and Standard had very different ring gears and pinions. They both had a 4.11 ratio with a 3.82 optional but seldom found.
The first time Chevrolet used s 3.55 was 1950.

What I have must then be the optional 3.82 ratio. Will these gears work in a 1932?

I checked in my Hollander's Interchange manual and it doesn't show these gears fitting the 32 Chev.

If the gears don't work out for you, I'd be very interested in buying them, as they will fit in my 37 1/2 ton.

Mark

Hi Mark, Do you know the diameter of your ring gear? Do yo have any part numbers?

BeachVette,

I don't know the diameter of the ring gear, but the GM part number for the 42/11 ring & pinion set that fits the 35 and 36 is 602477. The ring gear should have the number 379508 stamped on it, and the pinion should have the number 595903 stamped on it.

Mark

I could find a set of numbers on each engraved by electric pencil for matching the ring gear with the pinon gear

What would the part numbers look like?

The part number on the pinion gear should be clearly stamped on the end face of the gear. I'm not sure where the number would appear on the ring gear. My Chevrolet Master Parts Catalog says that the ring and pinion gears are sold as a set, and not sold separately, and that each part is stamped with the part number. I believe back in the days when there were still a few manufacturing plants left, there were after-market suppliers who supplied ring and pinion gears, so if the gears you have don't have the part numbers mentioned in a previous post clearly stamped on them, then they're probably not OEM GM parts. Which is not to say that they're bad--just that it may be difficult to positively identify what vehicles they will fit.

Mark

The ring and pinon have an matching engraved number on them indicating they are a matched set. There is no part number stamped but they both have "Made in the USA" stamped on them.They must be after market but since it is 3.81 ration I assume the set is for a 36. All the parts I picked up came from an estate where the owner restored 2 1936 Chevys.

Remember that the 1936 Standard and Master ring gear and pinions are not the same.

Are the ratio's the same or were they different to?

They are the same.

Ok, thanks. Thought these may work in my 32 when i picked them up but I guess not. i will have look for a set of Larry Jackson gears for my car

As I interpret my 1929-52 Chevrolet Master Parts Catalog, the 35 and 36 Standard Models (EC and FC) were available only with the 4.11 rear end (37-9 teeth). The 35 and 36 Standards used the same ring gear but the pinions were different, and the Standard model 4.11 gears were different from the Master Deluxe 4.11 gears.

The 35 and 36 Master Deluxe models and 1/2 ton trucks (EA,EB,ED,FA,FB,FD), plus the 37-39 1/2 ton trucks were available with either the 4.11 (37-9 teeth), all the same part numbers, or the 3.82 (42/11 teeth), all the same part numbers.

The only other models between 1929 and 1952 that used the 3.82 (42/11 teeth) gears were the 1929 passenger (AC), and they were different part numbers than the 35, 36.

Since the 3.82 gears that you have are not stamped with Chevrolet part numbers, without comparing dimensions, you can't really be sure if they're for a Chevrolet or not. In any case, it doesn't look like they'll work in your 32.

Mark

The 1935 EC Standard 3.82 ratio ring gear and pinion was part #601749.
The 1936 FC Standard 3.82 ratio was part #602044.

They were discontinued by 1952 due to the fact that they were not common parts.
They also came as standard equipment with the special economy engine.

This is all really great information guys. Thanks for your help

BeachVette, if you are able to positively ID the ring and pinion you have, and it is the 1936 FC Standard 3.82 ratio part #602044 (as indicated by Gene), I would be interested in it.

Thanks!

(P.S. How much difference would the 3.82 vs. the 4.11 make in cruising speed? With the 1936, 45-50 mph is the comfortable cruising range I find with the 4.11)

I wish I had a set that I knew for sure was from a 36 or if I at least had the dimension's I could compare. I have no reason to believe these are from any other year other then 36. If any of you guys think of a way I can positively identify these gears let me know. The gears look like NOS

the Master ring gear was over 9" in diameter. The Standard was over an inch smaller.
With the 3.82 the engine will be turning over about 7% slower which would a a 3 1/2 MPH speed gain at 50 MPH. 55 MPH should be a good safe crusing speed for a '36 with a 4.11.

I remember researching the faster gears, for my '35 Standard, a few years back. As I recall, a different carrier assembly is required. It is probably harder to find than the gears.

Mike

1934 Standard Model DC & 1935 Standard Model EC crown wheel & pinion :

Crown wheel diameter: 8 7/16"(O.D.) X 4 27/32"(I.D.)
10 rivet holes

Stem type pinion, 9 1/8" O/all length,rear bearing dia.
1.732",front bearing dia. 1.102",1 thread,10 splines.

1935 Master EA & 1936 Master FA,1935-36 Commercial Delivery,
18 CWT.,models EB & FB(Canadian)crown wheel & pinion:

Crown wheel diameter:9 7/16"(O.D.) X 5 5/58"(I.D.)
12 rivet holes

Stem type pinion,9 7/16" O/all length,rear bearing dia.
1.828",front bearing dia. 1.181",1 thread,10 splines.

1936 Standard FC crown wheel & pinion:

Crown wheel diameter:8 3/8"(O.D.),4 27/32"(I.D.)
Stem type pinion,9 1/4" O/all length,rear bearing dia.
1.731",front bearing dia. 1.181",1 thread,10 splines.

Ratios listed in a June 1956 "Diamond S" gear catalogue are:

1934-35 STD. 37-9 tooth count(4.11:1 ratio)

1935-36 Master EA & FA,Commercial delivery,18CWT models
EB & FB. 41-10 tooth count(4.1-1 ratio)

1936 Standard: 37-9 tooth count(4.11:1 ratio)

Hope this helps.

Thanks for the great info. I will check the dimensions on the gear set for comparison.