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Beast388 · 10-14-2003, 09:55 PM

I just finished swapping in a set of '77 3/4 ton axles under my '71 Burb.

For the 14BFF, I had to make my own perches and weld them on at the correct 40" center to center spacing. The worst part was grinding off the old perches, spent about 6 hours doing that. You can find new perches at www.echobit.com .

I welded my perches on at the factory pinion angle, but you can weld yours on at whatever angle you want. I would suggest mocking up the axle under the truck and matching the t-case/driveshaft angle with pinion/driveshaft angle. Then you could tack the perches in place and pull the axle back out to fully weld them on.

I did a rear disk swap on the 14BFF as well.

10-14-2003, 09:55 PM	#3
Beast388 Suburbans RULE! Join Date: Jan 2000 Location: Clinton, IA 52732 Posts: 689	I just finished swapping in a set of '77 3/4 ton axles under my '71 Burb. For the 14BFF, I had to make my own perches and weld them on at the correct 40" center to center spacing. The worst part was grinding off the old perches, spent about 6 hours doing that. You can find new perches at www.echobit.com . I welded my perches on at the factory pinion angle, but you can weld yours on at whatever angle you want. I would suggest mocking up the axle under the truck and matching the t-case/driveshaft angle with pinion/driveshaft angle. Then you could tack the perches in place and pull the axle back out to fully weld them on. I did a rear disk swap on the 14BFF as well. __________________ --Ben 71 GMC Suburban 4X4 The "Beast" 388 CID Stroker, TH350, NP205, 8-lug D44, 14BFF w/ Detroit, 4.10:1 gears, 4-Wheel Disks 4" Lift, 35" MT/R's. Last edited by Beast388; 10-14-2003 at 10:00 PM.