CPP conversion axles question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Nobby** · 03-26-2012, 09:43 PM

OK I got my axles in from CPP, so I'm pumped to get them in and set this thing on the ground. The holes are not big enough for the 1/2'' studs....It's to late to call CPP and I don't want to be mad all night. Has this happen to anyone? Do I need to drill them out? Maybe get some 7/16'' studs?
Thanks,

chevy_mike · 03-26-2012, 11:38 PM

5 lug axles use 1/2" studs. I think the holes in the wheels are designed for 1/2" studs and I don't think you'll get wheels to tighten up correctly with the smaller ones.

**Captainfab** · 03-26-2012, 11:48 PM

If they're 6 lug axles, then they will be setup for 7/16" studs. If they are 5 lug, they should be setup for 1/2" studs. Either way, I would drill them out for 1/2" studs. Probably overkill on 6 lug, but that's what I would do.

Rooster's 67 · 03-28-2012, 12:56 AM

when you say they dont fit do you mean that the threaded part wont fit or the part with the Knurl ? the threads should go all the way through until the knurl is against hole, then use a lug nut to pull the stud home. you may need washers to have space for the knurl to come thru the face of the flange and seat completely on the back of the flange.

Heres the first video i found about how to replace/install studs
http://www.youtube.com/watch?feature...&v=XX9te2iFH3E

**Nobby** · 03-28-2012, 08:17 AM

Thanks guys,It is the 5 lugs axles.The holes for the studs were to small and the threaded part of the studs would'nt fit. Talked to the guy at CPP and he said "sometimes you have to ream out the holes". I'm well aware of fabricating on older cars but when you spend good money on a new part it should work. Anyway I brought them to my friends machine shop and he drilled them out for me. Everythings fine now.
Thanks,

scottofksu · 03-28-2012, 08:52 AM

Quote:

Originally Posted by Nobby

Thanks guys,It is the 5 lugs axles.The holes for the studs were to small and the threaded part of the studs would'nt fit. Talked to the guy at CPP and he said "sometimes you have to ream out the holes". I'm well aware of fabricating on older cars but when you spend good money on a new part it should work. Anyway I brought them to my friends machine shop and he drilled them out for me. Everythings fine now.
Thanks,

Thank you Taiwan? I agree with your sentiment; it is ridiculous that you had to drill out brand new axles. However, I wonder if it was a problem with the manufacturer of the axles or the studs... Given that (I assume) none of the studs fit, I would guess it was a problem with the axle manufacturer...

03-26-2012, 09:43 PM	#1
Nobby Senior Member Join Date: Feb 2005 Location: St. Amant Louisiana Posts: 840	CPP conversion axles question OK I got my axles in from CPP, so I'm pumped to get them in and set this thing on the ground. The holes are not big enough for the 1/2'' studs....It's to late to call CPP and I don't want to be mad all night. Has this happen to anyone? Do I need to drill them out? Maybe get some 7/16'' studs? Thanks,

03-26-2012, 11:38 PM	#2
chevy_mike Never Ending Projects Join Date: Jul 2006 Location: San Diego, CA Posts: 3,836	Re: CPP conversion axles question 5 lug axles use 1/2" studs. I think the holes in the wheels are designed for 1/2" studs and I don't think you'll get wheels to tighten up correctly with the smaller ones. __________________ . 1965 C10 Panel, Tiki Express http://www.67-72chevytrucks.com/vboa...d.php?t=506580 SOLD 1968 Chevy C10, Long, Fleetside, Hot Rod Hauler http://67-72chevytrucks.com/vboard/s...d.php?t=313233 SOLD 1965 Chevy C10, Long, Fleetside, Hot Rod C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415702 SOLD We were given two ears and one mouth for a reason... listen twice as much and speak half as often...

03-26-2012, 11:48 PM	#3
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,247	Re: CPP conversion axles question If they're 6 lug axles, then they will be setup for 7/16" studs. If they are 5 lug, they should be setup for 1/2" studs. Either way, I would drill them out for 1/2" studs. Probably overkill on 6 lug, but that's what I would do. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

03-28-2012, 12:56 AM	#4
Rooster's 67 Registered User Join Date: Sep 2003 Location: DFW Posts: 765	Re: CPP conversion axles question when you say they dont fit do you mean that the threaded part wont fit or the part with the Knurl ? the threads should go all the way through until the knurl is against hole, then use a lug nut to pull the stud home. you may need washers to have space for the knurl to come thru the face of the flange and seat completely on the back of the flange. Heres the first video i found about how to replace/install studs http://www.youtube.com/watch?feature...&v=XX9te2iFH3E __________________ The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?

03-28-2012, 08:17 AM	#5
Nobby Senior Member Join Date: Feb 2005 Location: St. Amant Louisiana Posts: 840	Re: CPP conversion axles question Thanks guys,It is the 5 lugs axles.The holes for the studs were to small and the threaded part of the studs would'nt fit. Talked to the guy at CPP and he said "sometimes you have to ream out the holes". I'm well aware of fabricating on older cars but when you spend good money on a new part it should work. Anyway I brought them to my friends machine shop and he drilled them out for me. Everythings fine now. Thanks,



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