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EFV-8 Club Forum / General Ford Discussion / Updating Differential Gears in a '36

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Discussion Topic: Updating Differential Gears in a '36

Jcoles

05-21-2019 @ 4:56 AM

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I have been given a complete 1940 rear end that has been rebuilt with the new 3.54 gear set. My plan is to change the 4:11 gearing in a 1936 differential to the higher-speed gears. So, does it make better sense to swap the rebuilt '40 center section and solid driveshaft/torque tube with the center section currently in the 1936 rear end, rather than install the 3.54 gears in the '36 rear end and then convert the '36 hollow driveshaft to 6 splines?

This message was edited by Jcoles on 5-22-19 @ 10:22 AM

trjford8

05-21-2019 @ 7:18 AM

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If the drive shaft is the same length why not switch the complete unit?

Jcoles

05-21-2019 @ 7:59 AM

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"...why not switch the complete unit?"

Unfortunately can't just switch the entire unit because the radius rods and attachment brackets were destroyed when the unit was converted to open driveshaft. However, still have the original torque tube and driveshaft.

37RAGTOPMAN

05-21-2019 @ 1:11 PM

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HI
the solid driveshaft has a bearing in the center, and a grease fitting. if you use it make sure the bearing is good,
I would use the solid drive shaft. cause you do not have to weld a 6 spline adapter to the hollow drive shaft.
not unless you trust your welds,
you can get the parts from EARLY FORD SALES,, 1 800 417 3347 have the gaskets and gasket shims, seals,
That you will need,
IF YOU HAVE QUESTIONS, They have answers,
I assume the gears are all good?
I installed new gears on my 37 and bought all new parts, from FORD SALES they advertise in the V8 TIMES,
only wanted to do this job once,
you will have to change the speedo drive so speedometer reads correctly
My 2 CENTS, 37RAGTOPMAN

This message was edited by 37RAGTOPMAN on 5-21-19 @ 1:13 PM

Jcoles

05-22-2019 @ 5:30 AM

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I guess the question wasn't asked in a way that could be answered simply. So, a simpler version would be, "Will a 1940 driveshaft and torque tube fit without modification to the rear end in a '36 that has been converted to a 6-spline pinion?"

It seems this approach would be much easier than modifying the coupling on the '36 driveshaft from 6/10 to 6/6 . However, I got to wondering if I might be overlooking some detail that would explain why swapping to a later 6-spline driveshaft isn't preferred over retrofitting the earlier hollow 10-spline driveshaft and tube to fit a 6-spline pinion (for example, maybe the radius-rod angles and attachment points not the same on the '36 and '40 tubes, but will check).

37RAGTOPMAN

05-22-2019 @ 10:02 AM

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I would drain the gear lube and run a magnet though it to check for metal ,
IF that is ok,
I think
you can just use the 1940 drive shaft and the 1940 banjo housing and use the 1936 axle housing's
NOTE, first
I would measure from bolt to bolt to make sure they are the same, compare the 2
check the speedo drive gear , count the teeth, should be 17 ?
if not you could use a new speed drive gear 17 TOOTH 354 RATIO part # A-17271-A from Snyder's Model A FORD PARTS,
I used one on my 37 and it works perfect, you might have to shim your drive housing to drive shaft,so gears does not bind,
it is easier to do this now they later
good luck
37RAGTOPMAN'

This message was edited by 37RAGTOPMAN on 5-22-19 @ 10:06 AM

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