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#1 |
Registered User
Join Date: Dec 2010
Location: NC
Posts: 666
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Dropped Spindles - 3-3/4" Backspacing 15" Wheels
I know the topic has been discussed a good bit, but I have never seen a definitive answer for 3-3/4" backspacing.
I have 15"x8.5" American Racing 200s wheels. Looking to install drop spindles and I'm hoping I won't have to trim the lower control arm. I've seen some people say anything under 4" backspacing was ok. I've also seen people say 3.5" is max. Anybody ever tried 3.75" backspacing 15" wheels? Any spindles any better than the new CPP CP4S3? |
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#2 |
Registered User
Join Date: Jun 2013
Location: N/W Washington
Posts: 35
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Re: Dropped Spindles - 3-3/4" Backspacing 15" Wheels
My spindles should arrive this week and my wheels are 15x8.5 with 3.5backspacing. So if your not in a hurry ill let you know by the end of the week.
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67 longbed fleetside switching to a 67 shortbed stepside with a 71 front clip, front disks, 2.5" lowering spindles w/1" lowering spring in the front, 5" lowering spings w/1" lowering block rear, 255/6015 front and 275/60/15 rear on 15x8.5 slotted mags, 355/350, 12 bolt 4.11 posi. |
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#3 | |
Registered User
Join Date: Dec 2010
Location: NC
Posts: 666
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Re: Dropped Spindles - 3-3/4" Backspacing 15" Wheels
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#4 |
Registered User
Join Date: Mar 2005
Location: 10-Uh-See
Posts: 5,609
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Re: Dropped Spindles - 3-3/4" Backspacing 15" Wheels
They'll fit fine. I had 15x8's on mine with 3.75" bs when I first lowered it. No issues.
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#5 |
Registered User
Join Date: Dec 2010
Location: NC
Posts: 666
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Re: Dropped Spindles - 3-3/4" Backspacing 15" Wheels
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#6 |
Registered User
Join Date: Mar 2005
Location: 10-Uh-See
Posts: 5,609
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Re: Dropped Spindles - 3-3/4" Backspacing 15" Wheels
I had American Racing Hopsters. This pic is with 15x8 on all corners with 255/60/15 F 275/60/15 R on a 3.5/5 drop.
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#7 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,858
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Re: Dropped Spindles - 3-3/4" Backspacing 15" Wheels
I feel Early Classic parts are second to none.They are the Mack Daddy.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#8 |
Registered User
Join Date: Oct 2012
Location: Green Valley Arizona
Posts: 1,351
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Re: Dropped Spindles - 3-3/4" Backspacing 15" Wheels
You shouldn't have any rubbing issues with 3-3/4 BS. I had 2.5" CPP spindles with 15x10" with 4" BS...close but no rubbing on the spindle. I changed to 15x6.5 rally's with 4" BS....no rubbing. The 4.25" BS on a 15" wheel will not work without some grinding where the tie rod connects and possibly the LCA.
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1970 C10 Short Stepper with 71/72 front clip. |
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#9 |
Senior Member
![]() Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Dropped Spindles - 3-3/4" Backspacing 15" Wheels
I run 8x15 rally's all four corners, 3.5 drop up front w/2.5 drop spindles & 4" lowering springs out back...275/R60-15 BFG's and 4-3/4" back spacing all four... The issues were the tire's up front when the 2" drop springs didn't allow enough clearance for the tires in turns and bumps...I raised her back up 1" by reinstalling the factory coils with 1/2 coil cut off...72 C-10 LWB 350/350tb factory 5x5's all around..."just sayin"
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" ![]() "Be American, Buy American" ![]() |
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#10 |
Registered User
Join Date: Dec 2010
Location: NC
Posts: 666
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Re: Dropped Spindles - 3-3/4" Backspacing 15" Wheels
Well I'm convinced. I think I am going to buy a set of spindles and give it a try. I do wonder if a stock height spring vs a dropped spring makes a difference on clearance for the LCA. My thinking is that since you guys are running a cut or lowering spring that the upper and lower control arms are "closer" therefore allowing more clearance? Idk. Gonna try some spindles. Probably ECE. Worst case I have to cut 1/2 coil to make it all fit.
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#11 | |
Registered User
Join Date: Feb 2013
Location: Upland, Calif
Posts: 698
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Re: Dropped Spindles - 3-3/4" Backspacing 15" Wheels
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1957 CHEVY 1/2 TON SHORT BED 1940 FORD 1/2 TON SHORT BED |
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#12 |
Registered User
Join Date: Dec 2010
Location: NC
Posts: 666
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Re: Dropped Spindles - 3-3/4" Backspacing 15" Wheels
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