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BUSY BOLTERS Are you one?  The Shop Area
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Mod | | | Forums66 Topics126,777 Posts1,039,270 Members48,100 | | Most Online2,175
Jul 21st, 2025 | | | | Joined: Oct 2014 Posts: 3 New Guy | | New Guy Joined: Oct 2014 Posts: 3 | I Have a 57 Chev 1/2 Ton Pick up I But a 69 327 Engine In It and a Auto Tran What rear End Can I Use in it to Up Grad the Gear Ratio | | | | | Joined: Apr 2005 Posts: 2,832 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,832 | We have been using the 8.8 Explorer rear, lots of different ratios, cheap, plentiful, rear discs with great E-brake set up, many with limited slip, and fits the 55-59 well.
Evan
| | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | Have you done anything to the front axle? Disk brakes? Changed the bolt pattern? If you're looking to keep the 6 lug pattern, I would keep the stock rear, and either swap in the aftermarket 3.38 gears, or use an overdrive transmission. If you've changed the pattern up front (5 lug disk brake swap), then you'll want a rear to match the bolt pattern. With the Ford/Chrysler 5 x 4.5 bolt pattern, the 8.8 would be a good choice. If using the GM 5 x 4.75, look for a '98-'04 S10 4x4 with the ZR2 off road package. That one has a variant of the '88-'98 full size truck 8.5" rear with the 4.75 pattern, plus disk brakes. It's narrower than the full size truck, but wider than a standard S10.
Bill Burmeister
| | | | | Joined: Apr 2013 Posts: 144 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2013 Posts: 144 | you could probably find a used 700r4 from a z-28 or something for a reasonable price on craigslist...and keep your stock 3.91 or whatever the gearing is. | | | | | Joined: Apr 2010 Posts: 362 Shop Shark | | Shop Shark Joined: Apr 2010 Posts: 362 | Or look for a rear out of a gmc. My 58 has a 350 and about 300 hp using the original 3.07 gear in the rear. It pulls good and during the trip to the Devils Back Bone 2 weeks ago I got 15.5 mpg and cruised 65 mph down I64. Really happy with my set up using the old 3 spd with a 1:1 final drive. Now to pull it out and put that 3sp all syc in.Larry
58 gmc 100 with 350 sbc
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