CPP Drop Spindles: Conflicting Information

[ksbrktracer]

Originally Posted by sduckworth13

Tommy, looks like a 20x8.5 with 4.5 in backspace on the front is the perfect choice if using the CPP modular drop spindle. What is the backspace on the rear wheels?

Im gonna have to let Dennis answer that ... Im not sure , I Know he has 20X10's .

I will tell you that when I sell back wheels I reccommend 20X10's with 5.50 backspace for a fleetside with the wide rear axle . And depending on the drop a 285/40/20 or 295/40/20 tire with something along the lines of a 255/40/20 on the front and a 20X8.5 with 5.25 backspace when using standard drop spindles

[big d's red67]

Originally Posted by sduckworth13

Tommy, looks like a 20x8.5 with 4.5 in backspace on the front is the perfect choice if using the CPP modular drop spindle. What is the backspace on the rear wheels?

They are 20x10 with 5.5inch BS.

[sduckworth13]

Thank you.

[sduckworth13]

Thank you for all the info.

[mtnbikerxt]

OK. So I bit the bullet and bought the setup I was describing. The part number I bought was 6370SWBK6OE. This is described as "1963-70 O.E.M., 6-lug, drop, kit ". The kit comes with 2.5" drop spindles in the new smooth casting (no stiffening ribs on the "front" of the spindle (rotor side)). I took measurements of the spindles (distance from center of LBJ hole to wheel mounting face) and here are the results.

_____________________ LBJ Hole to Wheel Mounting Face
CPP CP4S2 Spindles ____ 5.302"
'70 C10 Drum Spindles___ 4.703"
____________________________________________________
Difference_____________ 0.599"

The CPP CP4S2 spindles move the wheels OUT relative to stock '70 C10 drum brake spindles by 0.6" EACH SIDE.

The actual drop is very close to the advertised 2.5".

Thus, the offset chart supplied by CPP (found here: http://www.classicperform.com/Instru...fset_Chart.pdf), which claims 1/16" wider than drums is incorrect.

[lolife99]

Originally Posted by mtnbikerxt

OK. So I bit the bullet and bought the setup I was describing. The part number I bought was 6370SWBK6OE. This is described as "1963-70 O.E.M., 6-lug, drop, kit ". The kit comes with 2.5" drop spindles in the new smooth casting (no stiffening ribs on the "front" of the spindle (rotor side)). I took measurements of the spindles (distance from center of LBJ hole to wheel mounting face) and here are the results.

_____________________ LBJ Hole to Wheel Mounting Face
CPP CP4S2 Spindles ____ 5.302"
'70 C10 Drum Spindles___ 4.703"
____________________________________________________
Difference_____________ 0.599"

The CPP CP4S2 spindles move the wheels OUT relative to stock '70 C10 drum brake spindles by 0.6" EACH SIDE.

The actual drop is very close to the advertised 2.5".

Thus, the offset chart supplied by CPP (found here: http://www.classicperform.com/Instru...fset_Chart.pdf), which claims 1/16" wider than drums is incorrect.

This is the most proof ANYONE has posted about track width "supposed" narrowing (on this forum) to date.
I agree they do narrow the track width.
By how much?
Even CPP doesn't know for sure.

[ksbrktracer]

Originally Posted by lolife99

This is the most proof ANYONE has posted about track width "supposed" narrowing (on this forum) to date.
I agree they do narrow the track width.
By how much?
Even CPP doesn't know for sure.

The spindles pictured above aren't designed to narrow track width, I'm sure you know that though. Just making an observation .

[mtnbikerxt]

Originally Posted by ksbrktracer

The spindles pictured above aren't designed to narrow track width, I'm sure you know that though. Just making an observation .

The issue I have is that they claim on their wheel offset chart that these spindles should move the wheels out 1/16" relative to a drum brake spindle. They ended up moving my wheels out 0.6" each side. This is a big discrepancy which makes my wheels sit too far out in the wheel well. Granted, I am running a wide wheel with a small backspace. However, if CPP had not posted incorrect information on their website I would have likely bought the modular spindles instead and not had these issues.

Anyone interested in some drop spindles that have never seen any use? Just painted and mounted up!

[LostMy65]

Originally Posted by mtnbikerxt

OK. So I bit the bullet and bought the setup I was describing. The part number I bought was 6370SWBK6OE. This is described as "1963-70 O.E.M., 6-lug, drop, kit ". The kit comes with 2.5" drop spindles in the new smooth casting (no stiffening ribs on the "front" of the spindle (rotor side)). I took measurements of the spindles (distance from center of LBJ hole to wheel mounting face) and here are the results.

_____________________ LBJ Hole to Wheel Mounting Face
CPP CP4S2 Spindles ____ 5.302"
'70 C10 Drum Spindles___ 4.703"
____________________________________________________
Difference_____________ 0.599"

The CPP CP4S2 spindles move the wheels OUT relative to stock '70 C10 drum brake spindles by 0.6" EACH SIDE.

The actual drop is very close to the advertised 2.5".

Thus, the offset chart supplied by CPP (found here: http://www.classicperform.com/Instru...fset_Chart.pdf), which claims 1/16" wider than drums is incorrect.

I had exactly the same results.
they move the wheels out in relation to drums - even though I was told by a vendor here that they wouldn't move my wheels out.
It's funny how this has been a topic of frustration in these forums for several years now.

[67ctener]

I think only the modulars claim to narrow track width. I know the modulars are only offered in 2" drop

[ksbrktracer]

Originally Posted by 67ctener

I think only the modulars claim to narrow track width. I know the modulars are only offered in 2" drop

This is correct ...! Standard spindles widen the track over drum brakes. They widen them to basically stock 71-72 track width give or take a tiny bit. Modular narrow the track width from 71-72 about 1'' to 1-1/8'' per side.

[lolife99]

Originally Posted by ksbrktracer

This is correct ...! Standard spindles widen the track over drum brakes. They widen them to basically stock 71-72 track width give or take a tiny bit. Modular narrow the track width from 71-72 about 1'' to 1-1/8'' per side.

Really?
Where did you get this info?
I've been trying to confirm this since the modular spindles came out.
1"-1-1/8" per side is a lot!!!

[ksbrktracer]

Originally Posted by lolife99

Really?
Where did you get this info?
I've been trying to confirm this since the modular spindles came out.
1"-1-1/8" per side is a lot!!!

From actual measurements. Converted a truck from standard CPP drop spindles to modular spindles. Measurements taken before and after. CPP is also quoting that measurement on their website now.

[big d's red67]

Originally Posted by ksbrktracer

From actual measurements. Converted a truck from standard CPP drop spindles to modular spindles. Measurements taken before and after. CPP is also quoting that measurement on their website now.

X2. It'sy truck that Tommy is talking about.

[LostMy65]

Anymore experiences of ones going from drums to modular spindles?
The standard cpp drop spindles moved my wheels out about 5/8" each side from where they were with drums.
Now I'd like to hear a couple more experiences from those who went from drums to modular spindles. It's just to costly of a purchase to not know for sure before hand.
Thanks

[ksbrktracer]

Originally Posted by LostMy65

Anymore experiences of ones going from drums to modular spindles?
The standard cpp drop spindles moved my wheels out about 5/8" each side from where they were with drums.
Now I'd like to hear a couple more experiences from those who went from drums to modular spindles. It's just to costly of a purchase to not know for sure before hand.
Thanks

I have been involved in the installation of 3 sets of CPP modular spindles. 2 of them involved replacing standard CPP drop spindles (which are shown above ) with the modulars. they narrowed the front track width by 1-1/8" give or take a 1/6''. We were able to put wheels on the front of both trucks that wouldnt otherwise fit. I do stock them ( $275.00 + shpg.) and the required bracket ($70.00 + shpg ) if you are using a D52 (stock type) caliper. Big brakes do not require the use of the extra bracket. Any questions please call . 918-845-1935.

For the record I personally Know of NO dropped disc brake spindle that narrows the front track width other than the Modular CPP. As far as I know all manufacturers dropped disc brake spindle moves the wheels out to at least 1971 and newer track width...... !

[LostMy65]

Thanks,
.


I need to know the track width change from drum brakes to cpp modular.
Has anyone went from drums to discs using cpp's modular spindles?
Did the track width get wider, and by how much?

[ksbrktracer]

Originally Posted by LostMy65

Thanks,
.


I need to know the track width change from drum brakes to cpp modular.
Has anyone went from drums to discs using cpp's modular spindles?
Did the track width get wider, and by how much?

I believe that the track width with Modulars is slightly narrower than a 1970 and older drum brake setup ... I believe the figure is about 1/4'' narrower than drum . I believe that 1971 and later were approximately 3/4'' per side wider track width than 1970 , back a 1971 up the 1-1/8 and that puts you at about 1/4''-to 5/16'' narrower give or take a fraction

[LostMy65]

Yes, that's what they tell us.
I need to KNOW. Not Believe.
I do appreciate your replies, but I need to hear from those who have actually went from drums to Modular.
Unless a vendor wants to guarantee that my wheels will not move out going from drums to modular, I'm not going to spend $300+ .
I was told by a vendor here that Cpp regular drop spindles would not move my wheels out going from drums. So I ordered a set.
They actually moved my wheels out 5/8".
I sent them back getting charged a restocking fee.
Thanks again for your replies.
I'm really wanting to hear some real life examples of one's who went straight from drums to modular.

[big d's red67]

Originally Posted by LostMy65

Yes, that's what they tell us.
I need to KNOW. Not Believe.
I do appreciate your replies, but I need to hear from those who have actually went from drums to Modular.
Unless a vendor wants to guarantee that my wheels will not move out going from drums to modular, I'm not going to spend $300+ .
I was told by a vendor here that Cpp regular drop spindles would not move my wheels out going from drums. So I ordered a set.
They actually moved my wheels out 5/8".
I sent them back getting charged a restocking fee.
Thanks again for your replies.
I'm really wanting to hear some real life examples of one's who went straight from drums to modular.

Ok, here we go again. I am NOT a vender, I went from drum to regular drop spindles to the CPP moduler spindles and I know for a fact not guessing not maybe but diffent the modular spindles are 1 1/8 inch narrower than the regular drop spindles and about a 1/6 inch wider than drums. I'm sure there a veranceis from truck to truck but not much.

[LostMy65]

Originally Posted by big d's red67

Ok, here we go again. I am NOT a vender, I went from drum to regular drop spindles to the CPP moduler spindles and I know for a fact not guessing not maybe but diffent the modular spindles are 1 1/8 inch narrower than the regular drop spindles and about a 1/6 inch wider than drums. I'm sure there a veranceis from truck to truck but not much.

.
I can understand the irritation or frustration with repeating the same information over and over.
'Here we go again' is only because we've had overwhelming misinformation.
In no indefinite terms it's been stated many times by cpp and some vendors that the wheels will not move out with any cpp spindles.
But the regular cpp spindles do move the wheels out 5/8". It's going to take a lot of positive experiences posted in these forums that the modular spindles do not move the wheels out over drums before I'm willing to spend $300.

[Leverhead]

And I'm still waiting for someone at CPP give me an answer about this. I've been getting the run around. I spoke to the person who created the CPP chart that shows the tread width changes for each of their castings. Now they are saying they may have messed...esp with the 1st gen c10 trucks. Since it is their mistake I thought it would be fair to have them let me send the std spindles back and send me either corrected new design std spindles or modulars (I would pay the diff for the modular) but still nothing.

Interesting 'bid d red67' says it is the modulars that move the wheels out 1/16 from drum and not the std spindles.....this is contrary to what I was told by CPP.

[gringoloco]

Digging it up, stirring the pot, then setting it on fire:

Here’s an easy way we can verify the differences. Straight edge on the wheel mounting surface, measure to the middle of of the lower ball joint (easy to find, it’s the grease fitting). This should eliminate most of the variance between trucks, a-arms, springs, etc. This will require some audience participation; I’ll start.

Belltech LD (light duty) 73-87 3” drop spindles. Kore3 C5 brakes (advertised as .03” narrower than a stock rotor, or negligible). I get roughly 4 15/16”.

Would be beneficial to see other setups’ measurements, stock, drum, disc, dropped, and most of all, modular. Anyone else care to pull a wheel to help settle this once and for all?

[LostMy65]

Okay thanks.
That's one experience.
Anxious to hear more.

[outlaw 3454]

read post 62, thats mine, i went from drums to 'supposed to be modulars' and they werent and my tires rubbed, not bad but they did...now i have nodulars and the wheels DO NOT rub and they are the same tire and wheel. when i say rub i mean when hitting a dip in the road they would touch, i dont think it was going to hurt anything but i didnt want it to touch AT ALL. the nodulars are the only way to go!