6 lug to 5 lug changeover list - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ty1295 · 06-17-2002, 04:20 PM

Can anybody confirm the req'd parts to change from 6lug to 5lug?

I have for sure
lower a arm
spindle, brakes, dust shields, on out

rear axles
and drums

changing over my 70 GMC, have all the parts, but have to have them shipped 2600 miles, so trying to only ship the req'd stuff.

Are the backing plates on rear the same?
What about tie rods, I assume they are the same.
Anything I am missing?

Jeff

**68SWB4x4** · 06-17-2002, 11:06 PM

you need the ball joints and tie rods for a disk brake truck

*Fast68Chevy* · 06-17-2002, 11:16 PM

all you need are shafts and drums for rear, i have all for 30 plus mail, from running truck if interested anytime soon.

front you will be best off to find a complete suspension from a 71-87 truck. preferably 79 at latest.
is direct swap over, the brake lines run on front side of cradle on 71pup and run behind it on pre-71 trucks, have to re-route all lines and hoses for later model and get brake proportion valve off a 71-up truck, and correct pitman arm and i prefer 73-up hoses because they are lots longr and pass through frame rail holes instead of having to worry about having to fab brackets to mount them in on the 64-70 cradles, calipers differ from 72 to 73 and so do hose ends,.

good luck

jamiew · 06-18-2002, 05:51 PM

I agree with ty1295, you should get the entire front cradle from a 73-87 chevy/GMC. I did the changeover on my 64 and it was relatively simple. Got the front entire front suspension from a rear wrecked vehicle. Cut the frame just behind the shock mounts and it bolted right up with little effort. On your 70 GMC, you will have to "egg out" the lower side frame mount holes as the 73-87 has a narrower bolt pattern. If you use from 80-87, you will have to drill another hole in the top side mount holes also. Everything else is a bolt on. Changing the entire cradle is the way to go. Makes it much easier to order parts and you don't have to mix and match parts. If you do the entire swap, be sure to get all the front brake lines and bolts from the donor vehicle. Best way is to have them cut the frame. Good luck whatever you try.

JamieW

DR67 · 06-18-2002, 06:16 PM

I guess I am missing something, what is the advantage of 5 lug over 6 lug.

bbs1965 · 06-18-2002, 09:43 PM

wheel selection

**Tim Christian** · 06-18-2002, 09:50 PM

But now wheel selection is great for 6-lug! IMO

*racedvl* · 06-18-2002, 11:03 PM

And disk brakes!!!

06-17-2002, 04:20 PM	#1
ty1295 Registered User Join Date: Mar 2002 Location: jeffersonville, IN Posts: 99	6 lug to 5 lug changeover list Can anybody confirm the req'd parts to change from 6lug to 5lug? I have for sure lower a arm spindle, brakes, dust shields, on out rear axles and drums changing over my 70 GMC, have all the parts, but have to have them shipped 2600 miles, so trying to only ship the req'd stuff. Are the backing plates on rear the same? What about tie rods, I assume they are the same. Anything I am missing? Jeff __________________ Jeff Scott '70 GMC Stepside, Short box '63 Nova '92 GMC typhoon '95 Tahoe

06-17-2002, 11:06 PM	#2
68SWB4x4 Strongman Garage Join Date: Apr 2000 Location: Salinas, CA Posts: 10,241	you need the ball joints and tie rods for a disk brake truck __________________ Kalle 68 GMC Suburban 1500 4x4 SOLD 69 Pontiac Lemans 99 Silverado 4.8 5 speed ECSB [ Facebook Instagram Subscribe on YOUTUBE

06-18-2002, 06:16 PM	#5
DR67 Registered User Join Date: Feb 2002 Location: Knoxville, Tn. USA Posts: 205	I guess I am missing something, what is the advantage of 5 lug over 6 lug. __________________ Dave Knoxville,Tn.

06-17-2002, 11:16 PM	#3
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	all you need are shafts and drums for rear, i have all for 30 plus mail, from running truck if interested anytime soon. front you will be best off to find a complete suspension from a 71-87 truck. preferably 79 at latest. is direct swap over, the brake lines run on front side of cradle on 71pup and run behind it on pre-71 trucks, have to re-route all lines and hoses for later model and get brake proportion valve off a 71-up truck, and correct pitman arm and i prefer 73-up hoses because they are lots longr and pass through frame rail holes instead of having to worry about having to fab brackets to mount them in on the 64-70 cradles, calipers differ from 72 to 73 and so do hose ends,. good luck

06-18-2002, 05:51 PM	#4
jamiew Registered User Join Date: Jan 2002 Location: Smithville TN, USA Posts: 54	I agree with ty1295, you should get the entire front cradle from a 73-87 chevy/GMC. I did the changeover on my 64 and it was relatively simple. Got the front entire front suspension from a rear wrecked vehicle. Cut the frame just behind the shock mounts and it bolted right up with little effort. On your 70 GMC, you will have to "egg out" the lower side frame mount holes as the 73-87 has a narrower bolt pattern. If you use from 80-87, you will have to drill another hole in the top side mount holes also. Everything else is a bolt on. Changing the entire cradle is the way to go. Makes it much easier to order parts and you don't have to mix and match parts. If you do the entire swap, be sure to get all the front brake lines and bolts from the donor vehicle. Best way is to have them cut the frame. Good luck whatever you try. JamieW

06-18-2002, 09:43 PM	#6
bbs1965 Open Sundays 10 till 10 Join Date: Nov 2000 Location: Waxahachie,Texas 75165 Posts: 1,009	wheel selection

06-18-2002, 09:50 PM	#7
Tim Christian Senior Member Join Date: Dec 1999 Location: TN/VA Posts: 6,388	But now wheel selection is great for 6-lug! IMO

06-18-2002, 11:03 PM	#8
racedvl Account Suspended Join Date: Jan 2000 Location: Woodstock, IL Posts: 7,020	And disk brakes!!!



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