The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - difference between a 78 front axle and a 72?

**Yukon Jack** · 02-28-2009, 10:32 PM

Yep, bolts right in. On my 70 K5 I put a 78 3/4 ton's front axle in and the only thing I had to modify was my front brake lines. I had swapped in the 78's power brake booster and needed adapters to mate it to the 70's front hard line and then I found I was going to need adapters to mate the hard line to the 78's rubber brake lines. I ended up just replacing the hard line so I wouldn't have all those adapter fittings.

02-28-2009, 10:32 PM	#2
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,689	Re: difference between a 78 front axle and a 72? Yep, bolts right in. On my 70 K5 I put a 78 3/4 ton's front axle in and the only thing I had to modify was my front brake lines. I had swapped in the 78's power brake booster and needed adapters to mate it to the 70's front hard line and then I found I was going to need adapters to mate the hard line to the 78's rubber brake lines. I ended up just replacing the hard line so I wouldn't have all those adapter fittings. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14