GM TBI Or TPI 305 And 350We're nearly positive you're not going to stumble across a Holley TPI-equipped engine in the junkyard like this one, but you will trip across dozens of throttle body (TBI) 305s and 350s in late-model pickups and vans. We're even starting to see TPI-equipped Firebirds, Camaros, Corvettes, and some LT1 Caprices make their way to the great car garage in the sky. Don't sweat if the harness has been chopped because Painless Performance has replacement harnesses. Just make sure all the sensors and injector hardware are present. | 
Ford 9-InchFor a lot of Jeep owners, swapping in a '77-'86 9-inch from a Ford F-150 or Bronco makes sense. They're 65-inches wide (van housings are about 3-inches wider), most have 31-spline shafts, the wheel pattern is 5x5.5, and they have big drum brakes. Look for a big "N" (shown in yellow) in the centersection to designate the desirable stronger Nodular iron centersection. |
4.0L Throttle BodyFor the four-banger crowd, an inexpensive alternative to an aftermarket bored throttle body is to use the stock 58mm 4.0L throttle body from a '91-up XJ or MJ or a '94-up ZJ in place of the stock 52mm throttle body. All the four-cylinder sensors will cross over and the throttle body bolts right to the manifold. | 
Ford U-bolts And Spring PlatesIf you need some U-bolts and spring plates for 3-inch axletubes, any '77-'86 Ford F-150, Bronco, or van has 'em. But make sure they are in good shape. |
Any Granny TrannyNot what you're thinking. We're talking about any '47-'67 SM420, '68-'88 SM465 (shown), '64-'93 NP435, or '66-'89 T-18 four-speed crash boxes. Any one of these trannies has a good First gear in the 6.32 to 7.02 range and can be easily adapted to several engines and transfer cases with the help of Advance Adapters, Novak Adapters, and JB Conversions. You'll find the SM transmissions in GM 1/2 - 2 1/2-ton trucks, the NP transmissions in Dodge and Ford vehicles, and the T-18 in Ford, International, and Jeeps. | 
Chevy CalipersIf you're contemplating a front or rear disc brake swap, you need to nab yourself a pair of '71-'91 calipers. There are subtle differences between the '78-earlier and '79-up generations, but if you're building your own brackets they're a great starting point and you can get parts and pads for them anywhere. |
'80-'91 FSJ Dana 44
Yeah, they're six-lug and some have the crappy vacuum-actuated center axle disconnect feature, but at 59-inches wide and with 30-spline shafts, these driver-side pumpkin axles make a compelling argument for a cheap YJ, TJ, or ZJ swap. Check out the Isuzu Dana 44 rear axle swap in this story and you don't even have to change the lug pattern.
'93-Up Isuzu Dana 44 Rear
The Dana 44 rear in Isuzu cute utes is 58-inches wide, has six-lug axles, and comes from the factory with disc brakes. You'll need to swap out the weird metric flange for a standard Dana 44 1310 or whatever yoke and cut and weld the spring perches to fit.
No Disconnect Dana 30The high-pinion, non-disconnect Dana 30 housing found in '89-'99 and some '00 XJs is a great bolt-in swap for TJs with the low-pinion Dana 30. If you lop the mounts off and weld on spring perches, it makes a darn fine replacement for the CAD-equipped YJ front axle.
XJ And MJ Dana 44 Rear
While rare, we do stumble across the coveted Dana 44 used sparingly in XJs and MJs from '87-'89, usually in vehicles with the optional tow package. If you see a trailer hitch on a unibody Jeep in the junkyard, it's worth sticking your head under to see what rear axle is in it. These 60-inch wide axles are a great swap for most YJ, XJ, and even TJs.
Ford 8.8
While they're a full 1 1/2-inches narrower than a Jeep axle, the Ford 8.8 rear axle found in Ford Explorers has the same 5x4.5 bolt pattern found on the XJ, YJ, and TJ. Look for the '95 and newer versions because they're usually found with 4.10 gears, disc brakes, and 31-spline axleshafts. Install kits are even available through the aftermarket.