Convert '87 -1/2 ton to '87 -3/4 ton - The 1947 - Present Chevrolet & GMC Truck Message Board Network

daveM · 10-08-2005, 09:04 AM

So what do I do? Just add a couple springs in the back or is there a big difference between the two?

Front end stuff, brakes come to mind.

*iceman7329* · 10-08-2005, 09:36 AM

3/4 ton is also 8 lug wheels

Russell · 10-08-2005, 10:17 AM

Basically be the rear diff, rear springs, front spindles / brakes, and coils.

84_chevrolet · 10-08-2005, 06:07 PM

front axle is bigger rear axle is bigger it goes to 8 lug rims and the brakes are bigger on both axles u will have to change springs on the front and rear as the 3/4 tons are wider and more heavy duty, and you will have to get what they called a bastard joint for the rear u joint as the cross in the u joint is bigger on the 3/4 ton, you will also need the spring hangers from a 3/4 ton truck because they are offset different than the 1/2 tons

soleeagle · 10-09-2005, 01:02 AM

The u-joint that I used when I put the 14 bolt 3/4 ton axle under my Burb was P/N 21153 at Advance Auto Parts for $22.88. I used the 1/2 ton springs on the rear when I did the switch.

crosby · 10-09-2005, 10:32 AM

3/4 ton frames are bigger too (taller) although most of the parts are interchangeable. Usually when guys switch in 3/4 or one ton axles to a 1/2 ton, they keep the 1/2 mounts and related parts.

10-08-2005, 09:04 AM	#1
daveM Registered User Join Date: Mar 2005 Location: Edmonton, Alberta Canada Posts: 30	Convert '87 -1/2 ton to '87 -3/4 ton So what do I do? Just add a couple springs in the back or is there a big difference between the two? Front end stuff, brakes come to mind. __________________ __________________ Dave '87 Chevy Pickup (Nice) '75 CB750K Four Honda (beautiful) Quiet (stock exhaust) Till you get on it then she... Sounds Like a Porsche

10-08-2005, 10:17 AM	#3
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	Basically be the rear diff, rear springs, front spindles / brakes, and coils. __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

10-08-2005, 06:07 PM	#4
84_chevrolet Truck CRAZY! Join Date: Mar 2004 Location: douglas Posts: 81	a lot of work front axle is bigger rear axle is bigger it goes to 8 lug rims and the brakes are bigger on both axles u will have to change springs on the front and rear as the 3/4 tons are wider and more heavy duty, and you will have to get what they called a bastard joint for the rear u joint as the cross in the u joint is bigger on the 3/4 ton, you will also need the spring hangers from a 3/4 ton truck because they are offset different than the 1/2 tons

10-09-2005, 01:02 AM	#5
soleeagle Registered User Join Date: Sep 2003 Location: Shelbyville, Indiana Posts: 614	The u-joint that I used when I put the 14 bolt 3/4 ton axle under my Burb was P/N 21153 at Advance Auto Parts for $22.88. I used the 1/2 ton springs on the rear when I did the switch. __________________ Chuck '85 Chevy Silverado 4X4 '91 Chevy 4X4 Suburban http://www.cardomain.com/memberpage/545941

10-09-2005, 10:32 AM	#6
crosby Registered User Join Date: Aug 2004 Location: New Hampshire Posts: 437	3/4 ton frames are bigger too (taller) although most of the parts are interchangeable. Usually when guys switch in 3/4 or one ton axles to a 1/2 ton, they keep the 1/2 mounts and related parts. __________________ Crosby 1978 Chevrolet K10 stepside NH

10-08-2005, 09:36 AM	#2
iceman7329 Account Suspended Join Date: Mar 2005 Posts: 453	3/4 ton is also 8 lug wheels



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