Coys Wheels Fitment Problem

[Toxic Orange]

Hoping to get some thoughts from those with Coys wheels. I am in the process of installing my new set of C5 Coys. Got the front on no problem, guess the corrected the whole center cap thing. My problem is with the rear. I can't get the wheel to seat up against the brake drum, it hits on my axle center too soon. Its as if my drums go on too far or the center axle (round part in the middle) sticks out too far. Anyone else experienced this and have any advice how I should proceed? Thanks

[Andy4639]

I didn't need it for this problem but I used a 1/4" spacer to keep the inner side wall of the tire from rubbing the inside fender. I also used longer lug nuts that would go through the wheel and spacer to get max thread engagement.

[J kippin]

I recently purchased a set for my 71 and had no issues 15x8 fronts and 15x10 rears. The fronts fit good with no cap problems. I am running a 3.0 drop in the front and had to grind a little off of the upper control arm.

[Toxic Orange]

Thanks guys. Crazy that I have not been able to find anything in the web about this problem so it may be isolated to me. Wonder if my rear drums are not 100% correct for the application.

[CC69Rat]

In no way assuming, but this is just my first thought.

Measure the rear end housing from the back side of one brake backing plate to the other side. Is this point closer to 55.5" or 57" wide?

My thought is your rear axle housing is 55.5" wide.. maybe you converted it to 5 lug and they sent / maybe you used the later year model axles? Maybe aim misunderstanding. .. ?

Post up a picture if you can please.
Posted via Mobile Device

[Toxic Orange]

Originally Posted by CC69Rat

In no way assuming, but this is just my first thought.

Measure the rear end housing from the back side of one brake backing plate to the other side. Is this point closer to 55.5" or 57" wide?

My thought is your rear axle housing is 55.5" wide.. maybe you converted it to 5 lug and they sent / maybe you used the later year model axles? Maybe aim misunderstanding. .. ?

Post up a picture if you can please.
Posted via Mobile Device

Looks like I am around 55 from backer plate to backer plate. I uploaded some pictures to show what I am dealing with. The biggest problem so far seems to be the center of the axle. Its too big for the center of the rim. Just not sure how close I will be to my inner fender well once it actually will go all the way on. Will it be too close if I have the narrower rear end?

[J kippin]

Are those six lug axles re drilled for a 5x5 bolt pattern? if so the center hub may be the culprit.... Did you measure the hub and then recheck your whell to see if they are the same size?

[Toxic Orange]

The wheel fits up to the point where the 45 degree angle bevel stops. I would say its a good 1/8th of an inch from sitting flush. Also have 7/16 instead of 1/2 wheel studs. Weird.

[67_C-30]

Originally Posted by J kippin

Are those six lug axles re drilled for a 5x5 bolt pattern? if so the center hub may be the culprit.... Did you measure the hub and then recheck your whell to see if they are the same size?

I was just about to ask that same question. I had to machine center hub when I did this on a '70 I had.

[Toxic Orange]

Originally Posted by 67_C-30

I was just about to ask that same question. I had to machine center hub when I did this on a '70 I had.

So am I going to be too close to my fender well if I get it to fit over the center hub? Will I have to have spacers if I have the narrower rear end?

[J kippin]

depends on the offset of the wheel. what did you currently use for an offset? it may be the right length if it came from a 4x4 but that I don't know if they had a difference as the 1/2 ton 2wd had. 70 and down 1/2 ton 2wd did use a narrow rear compared to the 71 -72 1/2 ton 2wd.

[Toxic Orange]

They are Coys 20x10 with the 5.5 backspace.

[J kippin]

simple fix would be to double check the backspace if it will work take the rims to a machine shop and open up the wheel center on a VTL..... not the route I would go though. another option may be to pull the axles and have the center hub turned down to the corrected diameter...make sure to leave a step for the brake drums to center themselves on though.
This way you don't compromise the rim and will be able to sell them at a later date if you decide to change rims for whatever reason or swap out to the wider rear axle and want to still be able to center the rim on the hub instead of by the lugs.....

[J kippin]

take a straight edge and run it from the backside of the wheel. if the tire is already mounted even better. Measure from the straight edge down to the mounting flange.
Now take that same straight edge and measure for the brake drum to the inside of the inner wheel well that should tell you if they will fit and what you may have for clearance.

[Toxic Orange]

I was thinking the same thing about modding the rear end before the wheel. Seems the answer is having the axles modified. Crazy the trouble we go through to have some extra bling. I just need to make sure I will have proper clearance once I get them to seat up. If that doesn't work then I would be better off slapping some spacers and longer studs on and calling it a day. I still feel like I need to deal with the fact that the wheel studs are 7/16 rather than 1/2 inch.

[lolife99]

Wheel studs need to be 1/2".
Center hub of your "once 6-lug axles" needs to be machined more shallow.
(remove some of the height of the center hub)
The 20x10 wheels need to be 4.75"-5" backspace to work with the narrower rearend housing.
A 1" spacer will put you at 4.5" BS.
Might work, depending on tire height and suspension drop.

[lolife99]

Personally,... I would buy a set of Moser axles and be done.
http://www.moserengineering.com/axle...spline-31.html

Correct hub index size and lug stud size.
Plus those 40+ year old axles are gone.

[J kippin]

yeah I would go along with bigger studs. I don't like spacers but sometimes you just got to do what you got to do...LOL.
any chance of swapping in another axle?? from a 71 or 72?? that way you get the right studs and width.
I know on mine I am close with a 5.0 offset on a 15x10 with a 275 60 tire. I also have a static drop of 3.0 front and 4.0 in the rear

[J kippin]

wow Keith must have been posting as I was typing.....glad to see some one else with a much lower truck and knows more about his than I chime in.

[lolife99]

Originally Posted by J kippin

yeah I would go along with bigger studs. I don't like spacers but sometimes you just got to do what you got to do...LOL.
any chance of swapping in another axle?? from a 71 or 72?? that way you get the right studs and width.
I know on mine I am close with a 5.0 offset on a 15x10 with a 275 60 tire. I also have a static drop of 3.0 front and 4.0 in the rear

71-72 axles are 3/4" too wide,... per side,... for the early 67-69 rearend housing..

[J kippin]

I did know that I meant the whole rear axle swap not the axles themselves..... thanks for clarifying that it did sound like I meant just the axles themselves
I thought the difference went all the way to 70 though

[Toxic Orange]

I'm a 4/6 static drop so there are sure to be fender well issues if its too close. The Moser axles are nice but still does not solve the problem that my brand new wheels seem to have the wrong backspacing for my application.

Lowlife - Do you know what the spec is on how shallow the hub center should be? I think that and drilling out the 7/16 studs to 1/2 inch would be at least a short term solution. Mine is not posi and I want that so it may need to be a future upgrade to get both at the same time.

J Kippin - I think I could live with spacer if I could just forget they were back there. My memory is terrible so it wouldn't take long :-)

[Toxic Orange]

There is yet another option... I could start a trend of Coys in the front and rallies in the back.

[J kippin]

[QUOTE= I think I could live with spacer if I could just forget they were back there. My memory is terrible so it wouldn't take long :-)[/QUOTE]

That is funny right there!!

spacers may be you best bet. I am sure Keith will be able to help more with the spacer and axle shaft mods. I personally have never done anything like that.

[J kippin]

Hey if you did that I could send you a set of Maine plates....most of the trucks around here are like that but you will need a glass pack, jack it up and the GIT R DONE sticker LOL