Help Identifing these Rear Drums

Lug Nut · #1 (**permalink**) 06-18-2008, 04:20 PM

I'm doing the rear brakes on my 2wd 66 F100 long bed. I ordered new drums from LMC and the ones they sent me didn't match the ones I took off the truck. I went to the local NAPA and the ones they had listed looked identical to the LMC drums. The problem is that the ones I took off the truck are 3.5" deep and the replacements are 2.5"deep with a different flange. The drums that LMC sent me would work but the flange doesn't go back to meet the backing plate and leaves a 1/4' gap Click here for pictures.*
The rusty one is the one that I took off.

Does anyone recognize the old drums?

I thought the rear end on this truck was original but now I'm not so sure..
FWIW the shoes measure 1.75" wide.

Pickupmanx2 · #2 (**permalink**) 06-18-2008, 06:17 PM

Can't see the pics Lug,,,, you "should" have a Ford 9" in it,,,, last I remember, brakes were either 2" or 2 1/2", one or the other....

Lug Nut · #3 (**permalink**) 06-18-2008, 07:10 PM

Sorry. try this url:

picasaweb.google.com/nofalloff/FordDrums

NumberDummy · #4 (**permalink**) 06-19-2008, 06:16 AM

ALL 1957/67 F100's have 11" x 1 3/4" rear brake shoes. The rear brake drum surface width is 2"

C4TZ-1126-A .. Rear Brake Drum

Fits: ALL 1957/1967 F100 2WD & 4WD. This drum is no longer available from Ford.

I searched all the Ford dealer parts inventories in the US and came up with the following for C4TZ-1126-A.

Bowman Motor Sales in Bowman ND has two / Aitkin Motor Co in Aitkin MN has two / Willey Inc. in Ames IA has one.

Johnston Ford-Mercury in New Boston TX has one / Ohio Valley Ford in Moundsville WV has one / Griffen Ford-Mercury in Louisburg NC has one.

Obsolete Ford parts seller greensalescompany.com has TEN = 800-543-4959

banjopicker66 · #5 (**permalink**) 06-19-2008, 06:20 AM

Lugnut - Make another comparison with the drums for a 1972 F-100, and then again for a 1976 F-100. They had wider rear brakes. It is possible the entire rear end was switched out, or as in the case of my truck, the rear brakes were changed out for the later, wider ones.

I used the rear brakes from a '76 F-150, and the axle shafts from a '72 F-100 to make it all work right.

ND: Are the rear drums the same for '72 as for '76? That may also make a difference.

NumberDummy · #6 (**permalink**) 06-19-2008, 06:25 AM

Quote:

Originally Posted by banjopicker66

Lugnut - Make another comparison with the drums for a 1972 F-100, and then again for a 1976 F-100. They had wider rear brakes.

It is possible the entire rear end was switched out, or as in the case of my truck, the rear brakes were changed out for the later, wider ones.

I used the rear brakes from a '76 F-150, and the axle shafts from a '72 F-100 to make it all work right.

ND: Are the rear drums the same for '72 as for '76? Same sized brakes, but the drum part numbers are different.

That may also make a difference.

1968/79 F100's & 1975/79 F150's have 11 x 2 1/4" rear brake shoes.

The drum surface width is 2 1/2"

D4TZ-1126-A .. Rear Brake Drum / Fits: 1968/74 & 1975 F100/150's before serial number A25,000. (D4TZ-1126-A replaces C8TZ-1126-A)

E4TZ-1126-B .. Rear Brake Drum / Fits: 1975/79 F100/150's after serial number A25,000 (E4TZ-1126-B replaced D6TZ-1126-A).

D4TZ-1126-A is Obsolete = I found a few NOS in case anyone is interested / E4TZ-1126-B is still available.
================================================== ==============================
NOTE: D4TZ-1126-A is NOT the same as C4TZ-1126-A mentioned above in post #4. = Two different part numbers for two different drums for two different vehicles.
================================================== ================================================== ============================

Lug Nut · #7 (**permalink**) 06-19-2008, 10:01 AM

The brake shoes are 1-3/4". I bought new replacements (as well as slave cylinders and all the springs) by ordering the numbers in the catalog and they match the shoes that were on the truck. It's the drums that don't seem to match the part number specified. Is the part number stamped on the rear end? maybe determining if that is the correct rear would be the first thing I should do.

thanks

banjopicker66 · #8 (**permalink**) 06-19-2008, 08:30 PM

Lugnut - Compare your old drum with the two year ranges or types ND listed.
The details of the swap I am describing below are very complex, but I'll try to keep it simple:
It may be that you have a '66 rear axle, with '66 rear brakes, but with '68 - '72 axle shafts - those are the parts with the studs pressed into them.
The '68 - '72 shafts look identical to the '67 and earlier, but they extend about 1/4 or 1/2 inch out further from the backing plate than the '66 axle shafts.
You have to use a wider drum to account for the longer extending axle - and I am thinking this may have been what happened.
Someone may have swapped a '68-'72 rear axle into the truck, and kept the original '66 brakes.
Or something similar, who knows.
At any rate, if there is a mixing of parts from different years, your best way to find a fit is to compare parts side by side.

Hope this helps, and best of luck.

NumberDummy · #9 (**permalink**) 06-20-2008, 06:12 AM

There was a similar problem several months ago, a member bought some front drums from NAPA, they wouldn't fit.

I suspect this also might be the same case with the rear drums.

FTE member AirHarley, a NAPA partsman, solved the problem, coming up with the correct part number.

btw: I also suspect that lmc is using the same drums NAPA is.

lmc is a middleman, buying the parts from one supplier, and then selling them to whoever.

Call Green Sales, and ask them to compare the measurement of the drum they have (C4TZ-1126-A...the original correct one) with yours.