VCCA Home Forums TECHNICAL - 1945 AND EARLIER 1929-1932 How severe is the need for 1929-1930 Trany Gears?

I have been talking to gear makers and same story as the head as the price drops quickly for volume.

How difficult is it to find transmission cluster gears and input/output shafts?

I have been unable to source even a used one.

If some of the pieces are the same as 31, I might have some used pieces. What exactly do you need?...Joe

I have been restoring '29-'32 cars for some years now and have not seen any NOS or NORS transmission gears. I've rebuilt a number of transmissions with new bearings and bushings, reinstalling quite a few gears which really were too worn to be used. I think there is a sizeable market for the gears if they can be produced at a reasonable price.

The worn gears could probably be metal-sprayed and reground, but the cost would probably be prohibitive.

Just my two cents worth........

All the Best, Chip

C&P Automotive has a 1929-1931 transmission rebuild kit which includes shafts and bushings you can check out:


http://www.billypossum.com/C&P_Catalog/C&P_Catalog_rev_031225.htm

Based on the many transmissions that I have owned in the past with defective gears I would say there is a market for new gears for the 1929-31 transmissions. I have seen a few new old replacement stock gears over the years but they were definitely not plentiful.

I believe that the transmission gears are the same from 1925 thru 1931. The changes are in the transmission cases.

The parts list that I have shows that a couple of the transmission gears are different.

Thanks Joe,

I am looking for the input shaft gear which is part #590396 and is 8.5" long and 14 teeth on the spline shaft.

Straight cut gears too.

I can't help you with that one. That part is 29/30 & both the transmissions I have for parts are 1931. Sorry....Joe

Don't forget the main shaft on a 29 has 10 splines instead of the 6 of all the other years on either side of 1929 from 1925 to 1931. Could not tell you why but probably has something to do with the new and more powerful 6. The other gears might interchange if the shaft diameter and ratio is the same. You could probably take all the parts out of a case and put them in another years case but why?

In the parts reference materials, the 6 cylinder 3-speed transmission from 1929-1930 appear to have the same gears. Not sure about the case.

This only applies to the 6 cylinder 3 speed transmission.

Can anyone confirm with me?

Nope...the sliding gears are different for the 1929 transmission vs. the 1930 transmission. You need to refer to an early parts book like the 1929-32 parts book.

The case is the same for 1929 and 1930.

What parts book are you using and is it available from the Filling Station?

I am using the 1929-32 Chevrolet parts book and yes, it is available from the Filling Station.

It Is also available on Keith Hardy's online manual project.

1929 to 1932 online parts manual

Jack,

Did not find the reference to 1929 verses the 1930 for 6 cylinder three speed transmissions. Would you point that out to me

Check page 23. I shows the spline shaft and sliding gears are different.

Here is the link to page 23:

http://chevy.oldcarmanualproject.com/parts/1929_32/2932mppl023.html

Hi Guys,
If, as you say, 29 gears and parts are scarse and 29 to 31 insides are differnt, which gearboxes will fit the 29 bell or for that matter which boxes with thier bells will fit straight onto a 29 engine.
I would like to repair or swap my 1929 box without reinventing the drive train.

A 1930 transmission will bolt up to the 1929 transmission support since both the 1929 and 1930 transmission supports are the same.

TKS JY Dog,
Confirm only 1930, or can I also start looking for a later box as well?
Chris

If you use a later transmission you will have to change the 1929-30 transmission support out for a compatible bell housing for the later transmission. Might have to modify the drive shaft as well.

Seems to me it would be easier to stay with the 1929 transmission or go with a 1930 transmission.

Thank you sir, much appreciated.

You bet and good luck with your project.

The 29 and earlier gears differ in the number of splines and as you can imagine also the splined shafts from the '30 and later.