[snowmanhat]

'67 w/289 rear brake drums 1.75" vs 2.00"??

I bought what I thought was standard rear brake drums for my '67 coupe from CJ pony 10X2 and later the shoes for the 10X2 drums. After about a year, I finally got a chance to install the new drums and shoes today and found my old shoes are 1.75" wide.

Can I still us the 10 X 2 drums and shoes?


any guidance would be greatly appriciated.

 

[cmefly]

I bought what I thought was standard rear brake drums for my '67 coupe from CJ pony 10X2 and later the shoes for the 10X2 drums. After about a year, I finally got a chance to install the new drums and shoes today and found my old shoes are 1.75" wide.

Can I still us the 10 X 2 drums and shoes?


any guidance would be greatly appriciated.

I thought the backing plates are offset more on the 2" But my memory is not as good as it used to be. Others will let you know.

 

[beechkid]

Yes (if my memory serves me correctly)

 

[madstang78]

Yes you can switch. I did it myself

 

[snowmanhat]

I forgot to mention the motor is an original 289. If the 2" is standard to v8 rear drum why I have 1.75" I'm confused. I'm sure the backplates are original - I've owned the car for 25 years and put most milage on myself now at 118k.

Do I need to change backplates or adjust with spacers or other modification - looks a bit tight?

 

[JonK]

I did this also and if I remember correctly the pins are longer for the 2" wide shoe as it's a little taller. The drums were the same, the 1.75 just didn't touch the whole surface. I bought 2 lengths of pins from the parts store and returned the ones that didn't fit.

I think the really large drums, 11" X 2.5"?) were a popular swap for track cars off of big station wagons, galaxies, etc. but you'd need the backing plates, etc.
Jon

 

[snowmanhat]

thanks for your response - when you refer to the longer pins are to refering to the pins that hold the two small coil springs against the metal part of the shoe?

 

[CHOCK]

I guess I'm in the confused area as well on this issue.

Ok, Why did Ford make backing plates for the 1 3/4", Different plates for the 2". For sure about Less than a 1/4" back space, but indeed different.

For sure the Drums are different, 1 3/4" braking surface has 2" internal braking Surface, 2" has 2 3/8" (Or So) braking surface.

Could be be????? If you stuff a 2" Shoe in a 2" braking surface (1 3/4" Drum) could it cause a bind, locking problem??? I believe i'd think about this.

Dan @ Chockostang

 

[TheShagg]

I guess I'm in the confused area as well on this issue.

Ok, Why did Ford make backing plates for the 1 3/4", Different plates for the 2". For sure about Less than a 1/4" back space, but indeed different.

For sure the Drums are different, 1 3/4" braking surface has 2" internal braking Surface, 2" has 2 3/8" (Or So) braking surface.

Could be be????? If you stuff a 2" Shoe in a 2" braking surface (1 3/4" Drum) could it cause a bind, locking problem??? I believe i'd think about this.

Dan @ Chockostang

Pretty sure its the same backing plate for 1.75 and 2 inch. I recently went through this, it was a headache to figure out.

Finding pins was a problem. I had to mix and match two sets. My pins weren't long enough, but I found another set that came with deeper cup cap things, so that got the length where I needed it. The rear came with machine screws and lock nuts in place of pins - and I destroyed them getting the drum off.

 

[CHOCK]

Pretty sure its the same backing plate for 1.75 and 2 inch. I recently went through this, it was a headache to figure out.

Finding pins was a problem. I had to mix and match two sets. My pins weren't long enough, but I found another set that came with deeper cup cap things, so that got the length where I needed it. The rear came with machine screws and lock nuts in place of pins - and I destroyed them getting the drum off.

K/H Plates 65-68??? Dates are not perfect for 1 3/4"---Numbers are.

70867
70866

K/H for 2"

71086
71087





Bendix Plates 69 and newer for 1 3/4"

319480
319481

Bendix for 2"

317558
317559

Yes indeed, a difference.

Dan @ Chockostang

 

[cmefly]

K/H Plates 65-68??? Dates are not perfect for 1 3/4"---Numbers are.

70867
70866

K/H for 2"

71086
71087





Bendix Plates 69 and newer for 1 3/4"

319480
319481

Bendix for 2"

317558
317559

Yes indeed, a difference.

Dan @ Chockostang

I have a set of backing plates from a 1969 torino that uses the 2" wide shoes Part numbers are K/H 71085 and 71086 I use these on my 65 mustang

 

[CHOCK]

I have a set of backing plates from a 1969 torino that uses the 2" wide shoes Part numbers are K/H 71085 and 71086 I use these on my 65 mustang

The 69 should have been Bendix, but who know what date the 69 was built. Early can very well have K/H, late was Bendix contract.

The 80's numbers are 2". Not sure there either, but I've seen the difference as well.

The 60's numbers (Ending in 60's) are 1 3/4".

AT least this is what I've contrived over time. Measured many of these for back spacing, asking "What the hell is going on here"

There is a difference in the measure, GUARANTEE.

Dan @ Chockostang

 

[snowmanhat]

The numbers you are referring to -where are they located? on the inside of the plate? Sorry if this is a stupid question.

 

[cmefly]

The numbers you are referring to -where are they located? on the inside of the plate? Sorry if this is a stupid question.

You will find them on the outside

 

[JonK]

Yes, I am referring the shoe retaining pins that have the spring and cup twisted on the end that were longer. Dan would know better than I about drum fit. Sure enough I looked and the Raybestos part #'s are different for 10"X1-3/4" drum and 10"X2" drum. I do remember now that I bought new drums but thought they looked the same as the old ones, must not have noticed the extra 3/8" of pad surface.
Jon

 

[snowmanhat]

Just found the number on my back plate. Bendix 319480-L
according to chock that is 69 or newer but mine is a '67. Maybe it was changed years ago - would they have been enterchangable? Does this mean I must us 1.75" shoes and drums or will the 2" ones I purchased fit?

Thanks again for your help - sure would like to use the 2" but only if safe, they are not returnable at this time.