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Old 10-27-2020, 09:34 PM   #1
samsonized
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Default rear end identification

i have a rear end in my 35 cabriolet that is not a 35 but rather a 37-40 how do i tell what year it is.
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Old 10-27-2020, 09:36 PM   #2
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Default Re: rear end identification

Well, if it has the original backing plates, 37-38 were cable brakes and 39-40 were hydraulic.
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Old 10-27-2020, 09:37 PM   #3
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Default Re: rear end identification

nope juice brakes 46-48 backing plates
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Old 10-27-2020, 09:41 PM   #4
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Default Re: rear end identification

Don't think there is a lot of difference in the axles themselves. What are you attempting to figure out?
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Old 10-27-2020, 09:43 PM   #5
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Default Re: rear end identification

i would just like to know for maintenance in case there is a different in bearings or stuff like that
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Old 10-27-2020, 09:43 PM   #6
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Quote:
Originally Posted by samsonized View Post
i have a rear end in my 35 cabriolet that is not a 35 but rather a 37-40 how do i tell what year it is.

A picture would be helpful.


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Old 10-27-2020, 09:45 PM   #7
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Default Re: rear end identification

ill try to post one
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Old 10-27-2020, 11:44 PM   #8
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Default Re: rear end identification

Here's a link that will help you identify what you have.


http://goldengatev8.org/images/Stree..._magazine.html
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Old 10-28-2020, 12:30 AM   #9
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Default Re: rear end identification

35-36 radius rods which have the spring hangers attach to a bracket towards the end nearest the backing plates on the axle tubes.37-40 has a solid driveshaft so there is a grease zerk on the torque tube to service the bearing.
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Old 10-28-2020, 07:30 AM   #10
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Default Re: rear end identification

thank you so much is there an outword resistance between teh 37-38 and 39-40?
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Old 10-28-2020, 07:30 AM   #11
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sorry outward appearance
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Old 10-28-2020, 07:56 AM   #12
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Default Re: rear end identification

Mike it would just be the rearbones that Deuce Lover mentioned as the 35 36 mounted on the axle and later would be mounted on the ends by the backing plates.
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Old 10-28-2020, 07:58 AM   #13
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Default Re: rear end identification

i know it is a 37-40 but is there a way to tell if it is solid driveshaft or hollow driveshaft without taking it apart
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Old 10-28-2020, 08:03 AM   #14
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Default Re: rear end identification

No easy way of doing that I can think of ? Maybe pull off the speedo housing on the tube and scope it
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Old 10-28-2020, 08:13 AM   #15
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Default Re: rear end identification

had not thought of that i have a scope is it obvious the difference between the hollow and the solid at the front of the tube
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Old 10-28-2020, 09:01 AM   #16
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Default Re: rear end identification

*Note....not all '37's (or '38's) left the assembly plants with a solid driveshaft, center of driveshaft bearing, and zerk grease fitting in center of torque tube. These were transition years between tubular vs. solid driveshafts. The additional things to look for on '37-'40 rear axles would be that the rear radius rods/bones attach by the two lower backing plate bolts, and the spring hangers are integral parts of the axel housing assemblies instead of being attached to the back of radius rods/bones as '35-'36 were. So, the rear end "assemblies" from '35 to '40 (+ '41 PU's) are for the most part, interchangeable.
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Last edited by JM 35 Sedan; 10-28-2020 at 10:47 AM.
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Old 10-28-2020, 09:32 AM   #17
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Default Re: rear end identification

Quote:
Originally Posted by samsonized View Post
i know it is a 37-40 but is there a way to tell if it is solid driveshaft or hollow driveshaft without taking it apart

If it has the zerk fitting it is a solid shaft
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Old 10-28-2020, 03:14 PM   #18
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Default Re: rear end identification

Quote:
Originally Posted by samsonized View Post
thank you so much is there an outword resistance between teh 37-38 and 39-40?

No difference apparent on the outside. Inside, the only difference being the axles teeth changed from 18 to 16, and the matching Spider gear. Those sets are interchangeable. Pull up the link I posted previously for pictures and text.
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Old 10-28-2020, 04:36 PM   #19
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Default Re: rear end identification

thanks to everyone for their help
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Old 10-28-2020, 05:31 PM   #20
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Default Re: rear end identification

There's the 10-spline vs 6-spline pinion deal, which I didn't notice as being mentioned. I opened what I think was a 37 recently, which had the 37-up spring hangers, but had the hollow-tube d/s (which many people associate with 35-36), and it had a 10-spline pinion (which is generally considered for earlier). All I'm suggesting is, hard to tell what you really have, without looking inside. And, even then, you probably won't be able to pin down an exact year. And, after you learn all of this, then, for what purpose?
Go with the basics... 35-36 has spring hangers on the radius rods. 37-40 has spring hangers forged on axle housing ends. No zirk fitting on TT means 35 up to somewhere around 37-38. A zirk fitting on the TT means somewhere around 37-38, up to end of that style (40). Some might say 41, but 41 introduces another can of worms (unique spring hangers). Clear as mud? JMHO
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