S10 Rear Identification already in Vega

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S10 Rear Identification already in Vega

Postby Low_Bridge » Sun Apr 04, 2021 8:31 am

My 75 Vega came with 5 lug front & back. I bought as a roller. I was told it was S10 ~

It has no Brake hardware on the rear end just backing plates wheels bolted to axels.

Question: How do I determine what generation S10 rear I have to purchased the correct Brake drums, wheel Cylinders etc....

Thank you

Low
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Re: S10 Rear Identification already in Vega

Postby GermanMonza » Sun Apr 04, 2021 9:47 am

Hey Low,

I think you should check the spline count on the axle shafts and check the ring gear diameter. From what I know 83-92 S-10 trucks with a 7.5" ring gear are 26-spline, '88 and later S-10s with a 7.625" ring gear are 28-spline. Brakes should interchange iirc between all 7.5, 7.625 rears, as long as you buy all the hardware for the same year. Only a few S-10s with ZR2 option came with 8.5", which could have bigger drums but I'm not sure about that. Hope this helps.
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Re: S10 Rear Identification already in Vega

Postby Low_Bridge » Sun Apr 04, 2021 1:02 pm

I was hoping not to have to pop the cover but will take that route unless I get any other clues ~

At least it will reveal other secrets I'll eventually need to know anyway.

Thanks & will report back.
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Re: S10 Rear Identification already in Vega

Postby GermanMonza » Mon Apr 05, 2021 2:36 pm

Well you probably don’t have to, if it’s only about the brakes. 7.5 and 7.625 have the same diff cover, they’re easy to tell from 8.5s. Both have 10 bolts, but 8.5 covers are round and 7.x are more oval shaped. If you google that you will see it immediately.
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Re: S10 Rear Identification already in Vega

Postby Low_Bridge » Tue Apr 06, 2021 8:12 am

By the Backing plate I believe the rear to be first gen Series 1982 ?

My Goal is to know what I can order as I need everything after the backing plate forward/ outwards ( I know the backing plate has a bend or 2 to straighten)

So what are the biggest drum options?

Would a Backing plate from a later series fit enabling me to use a later series / gen brake set up!

I don't think I want to go disc ~

Thanks for the help German!


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Re: S10 Rear Identification already in Vega

Postby cammerjeff » Tue Apr 06, 2021 12:40 pm

Just doing a bit of Googling the backing plate looks to be the same style as the early 1980's 2WD S10's

https://www.partsgeek.com/gbproducts/DC ... gKYa_D_BwE

Note the picture on the site is rotated 180 from the picture you posted.
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Re: S10 Rear Identification already in Vega

Postby GermanMonza » Sat Apr 10, 2021 6:43 am

What Jeff said!


If you follow the link you'll see that the backing plate fits all the years from '82 thru '92, and your diff cover tells you it's a 7.5/7.625". I don't know if they made any different size drum brakes for S-10s, but I don't think so, even after '92.
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Re: S10 Rear Identification already in Vega

Postby Low_Bridge » Sat Apr 10, 2021 7:37 am

Funny My 81 Malibu has the same backing plate #........ so I'll analyze that take some measurements. oh year & the rearend pumpkin appears the same.... Thanks!
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Re: S10 Rear Identification already in Vega

Postby Monza Harry » Sat Apr 10, 2021 9:19 am

Low_Bridge wrote:Funny My 81 Malibu has the same backing plate #........ so I'll analyze that take some measurements. oh year & the rear-end pumpkin appears the same.... Thanks!

Yep only a little different width with-in the years of each I recall maybe 2 different backing plate styles for the S trucks Harry
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