Re: 1932 drive shaft and torque tube lengths

[denson1932]

From a previous post many months ago:

"Re: 1932 drive shaft and torque tube lengths
The round-flange 'B' torque tube is 54.87" and the companion drive shaft is 58.56" (+/-.01) in both cases. These are the dimensions shown on the original engineering drawing for the B-4000 rear axle assembly. Those for the late 18-4000-B straddle-mounted pinion axle released in late September, 1932 (used on both fours and V-8s) were 54.89" and 52.32" respectively."

However, i measured several 1932 'round' torque tubes and get a length of approx 53 3/8", and driveshafts about 56 1/2". And in agreement, The 'green' book lists the 'B' driveshaft length as 56 31/64". Was hoping to use official measurements to calculate how much to shorten 1934 TT/DS for use as '18' rear end. Right now i am calculating about 8 1/2" the amount to shorten the 1934 tube and shaft. Comments appreciated...

[Mart]

Be careful because the 33/34 TT/DS lengths differ between the V8 and 4Cyl.

If you want to use a 33/34 axle and TT/DS in a 32, what would be wrong with shortening them to the stated later 32 lengths?

In other words, simply state the length you want, rather than how much to shorten by.

Mart.

[denson1932]

I assume the 1932 'round' torque tube and the rare 1932 'hex' torque tube are the same length, since the msmt. from the axle centerline to TT flange surface is the same on either the 'B' or early 1932-34 'V-8' center case! However, the supplied msmts of 54.89" appear to be incorrect. The msmt of 53 3/8" must be correct for each.
The common 1934 V-8 TT is 61 7/8" long so the difference is 8 1/2"....i assume it is correct to remove the same amount from the 1934 driveshaft...

The incorrect measurements quoted are a problematic for anyone who trusts them so i was attempting to warn others....

[Mart]

No- the later centre section has a slightly longer snout than the earlier/4 cylinder. So a genuine 32 late torque tube is slightly shorter than an earlier 32 round flange torque tube.

I can't confirm your measurements, I only know there is a difference. I could measure the torque tube on my 32 if it would help, but it is one I shortened myself. A measurement check from someone with a stock late 32 rear end and torque tube would help as a sanity check.

Mart.

Edit: I found some dimensions listed in this post. It also mentions the difference between round flange and hex flange centre sections.

You want the torque tube to be .4 or .5 shorter than the round flange ones you measured.

Once you decide on a torque tube length, you can work out how much to shorten your 33/34 torque tube. If you then shorten the driveshaft by the same amount, you should have a driveshaft and torque tube of the correct matching lengths.

Mart.

[Flatout]

33-34 drive shafts came in two different lengths also, so it's important to know what length you want, rather than how much to remove from the 34. I recently brought home an original but rusty late '32 torque tube and drive shaft to be sure I get it right when I modify a 34 rear to fit my 32.

[PeteVS]

Sponsored Links (Register now to hide all advertisements)

A while ago, I measured up an 'A' banjo casting and a '35 banjo casting. The '35 is about .40" longer than the 'A' from axle centerline to TT flange face. Therefore scalloped tube '32 torque tube should be about .40" shorter than a round flange. I know that the late '32 through '34 banjo casting is different than the '35' bout I've never had one in my hand to measure.

[denson1932]

Originally Posted by Mart

No- the later centre section has a slightly longer snout than the earlier/4 cylinder. So a genuine 32 late torque tube is slightly shorter than an earlier 32 round flange torque tube.

I can't confirm your measurements, I only know there is a difference. I could measure the torque tube on my 32 if it would help, but it is one I shortened myself. A measurement check from someone with a stock late 32 rear end and torque tube would help as a sanity check.

Mart.

Edit: I found some dimensions listed in this post. It also mentions the difference between round flange and hex flange centre sections.

You want the torque tube to be .4 or .5 shorter than the round flange ones you measured.



Mart.

Actually i just now placed a B-4513 inner U. Joint Cap (same for 1932-1948 in the green book) atop first the 1932 round 'B' Torque Tube then atop the 1934 hex 'V-8' TT and both tests added identical 1" measurements....so the 'B' T.T. with cap total msmt. now=54 3/8" and the 1934 'V-8' T.T. with cap total msmt. now= 62 7/8". But perhaps there are various versions of these Torque Tubes out there?

[denson1932]

Originally Posted by PeteVS

A while ago, I measured up an 'A' banjo casting and a '35 banjo casting. The '35 is about .40" longer than the 'A' from axle centerline to TT flange face. Therefore scalloped tube '32 torque tube should be about .40" shorter than a round flange. I know that the late '32 through '34 banjo casting is different than the '35' bout I've never had one in my hand to measure.

Yes, the 1935-1937 #48-4025 center housing (later listed as #48-4017 1935-1948 in green book) is deeper in the pinion casting area as is the early 1932 #B-4025 center housing compared to the 1933-1934
#40-4025 center housing. As it turns out, the 1932 #B-4025 and the L1932-1934 #18-4025 housings are still the same measurement from AXLE CENTERLINE to Torque Tube flange! But indeed as noted the 1935 and later #48-4025 housing is deeper but these will not work as 1933-34 housings.

[Mart]

I may have given some misinformation. the later centre sections are longer than the 33/34/late32 type, I'm not sure if the 33/34/late 32 type are longer than early 32. From what denson1932 has stated, it sounds like they are the same.

Mart.

[PeteVS]

Looks like I gotta go find late '32 to '34 banjo casting to measure up. Does anyone have one that they can come up with a dimension? I measure from the TT flange to the OD of the axle housing flange and then add half of the axle housing OD to come up with the axle centerline to TT flange dimension.

[denson1932]

Originally Posted by PeteVS

Looks like I gotta go find late '32 to '34 banjo casting to measure up. Does anyone have one that they can come up with a dimension? I measure from the TT flange to the OD of the axle housing flange and then add half of the axle housing OD to come up with the axle centerline to TT flange dimension.

Basically i measure the same way except i use a 12" caliper an measure the INSIDE of the housing and divide by 2. Again i measure the T.T. flange surface to the INSIDE of the housing. The 1932 'B' center housing is smaller but the pinion depth area is deeper. Turns out the L1932-1934 center housing is bigger but the pinion depth area is less so the total comes out the same.

[PeteVS]

Originally Posted by denson1932

Basically i measure the same way except i use a 12" caliper an measure the INSIDE of the housing and divide by 2. Again i measure the T.T. flange surface to the INSIDE of the housing. The 1932 'B' center housing is smaller but the pinion depth area is deeper. Turns out the L1932-1934 center housing is bigger but the pinion depth area is less so the total comes out the same.

Ah, yes! I remember now. Trying to measure the outside of the banjo casting is worthless because it's a cast feature. The inside is machined (to close tolerances.) Yes, half the ID of the axle housing recess plus the distance from that recess to the TT flange. Sorry!

[bobH]

I've got a loose, bare 34 banjo, and 12-in calipers. Will try to figure & get what you've asked for....

Edit.... Here is what I've come up with....
Inside diameter (the machined diameter, where the bell-lip fits) is about 8.657-8.658
Inside diameter-to-torque tube flange is about 1.625
Sometimes someone will ask for the banjo case width - it's about 3.500
And, yes, a later (wider, 35-up) banjo case has been used in a 34. To see how, read rumbleseat's writeup on how he did it on his 34, with a Columbia. Certainly not for everyone, not for most of us. JMO