The front hangers grab the frame on three sides for a super strong connection:
The rear hangers grab the side and bottom of the frame, something that others have ignored that's an important feature in keeping the frame in one piece:
The 31.5" spring pad width axles are '70's Ford front axles (Dana 44 or Dana 60), the most desirable being the '77-79 axles as they are high pinion with disc brakes. Pros are that they are driver's side drop (which means you can keep your OEM transfer case if you want) and they're high pinion, cons are that they're the most desirable and usually demand the highest price.
32" spring pad width axles are any of the GM front axles (10
bolt, Dana 44 and Dana 60). Passenger side drop Dodge
front axle can be adapted to work as well. Pros are easy
availability, the only real con is that you have to switch to a
passenger drop transfer case (which we can help you do).
The '99 and newer Ford axles use an even wider spring pad spacing, we do not make a kit for those axles.
1994 and newer Dodge axles are driver's side drop but all are coil sprung and there are no options other than the stock steering, we do not make a kit for those axles.
The 1500 and 2500 Chevy's from 1988-1998 use an NP241 (floor shift), NP243 (Push button, 2HI, 4HI, 4LO) or an NP246 (Push button, Autotrac, 2HI, 4HI, 4LO, AUTO4WD). The 3500 trucks had either a Borg Warner 4401 or 4470 transfer case.
If your truck has the NP246 Autotrac transfer case, you'll have to swap it as it doesn't work correctly without the front axle sensors. The Autotrac transfer case has push button switches on the dash with an auto-4WD option.
The NP241, NP243, and either Borg
Warner transfer case works fine but you'll need to use a Ford
front axle because they all put the driveshaft on the driver's
side. The Ford 205 isn't a difficult retrofit either, as a
higher strength option, call us for details on adapting a Ford
205 (or any of our gear reduction systems) to a GM transmission.
Swapping to a passenger side transfer
case to use a GM/Dodge axle:
If you have a 700R4/4L60E, you'll want to find an NP208 from behind a 700R4 and those came in most 81-87 Chevy 1/2 tons (88 Suburbans and Blazers too!), these will have a 27 spline input. Those will bolt right in, the only issue is the 208's use a cable driven speedometer and the 4L60E needs an electric speed signal to shift correctly. That can be solved by installing an adapter that creates an electric signal from the cable drive, you can also put a manual valve body in the trans.
If you have a 4L80E or any of the manual transmissions, you'll need to find an NP208 from a TH400 or an SM465 four speed manual, those will have a 32 spline input. Again, the NP208 will bolt right up in place of the factory transfer case. The 4L80E will need an electric vehicle speed sensor or a manual valve body, the manuals will only need an electric speed sensor if you want the OE speedometer to work.
The 90 and 91 models, however, use an electric speed sensor in them from the factory so this makes them a very desirable case for solid axle conversions, though they aren't as common as the 208.
The 241 is the same story as the 208, if you have a 700R4/4L60E, look for a 241 from a 700R4.
If you have a 4L80E or any of the manual transmissions, look for a 241 from behind a TH400.
If you have a 700R4/4L60E transmission, you'll want the 205 and adapter system from behind a TH350 transmission. You'll need a shorter output shaft or a spacer:
and if it's the later 6 bolt tailhousing (with a removable bellhousing) you'll need a 6 to 4 bolt reducer.
If you have a 4L80E transmission, you have two options to get a 205 on it. You can use an '84 and older figure 8 pattern NP205, swap a long 32 spline input gear into it and use a TH400/fig 8 205 adapter that needs minor machine work to fit the 4L80E. You can also find an '85-91 GM 205 that will have a six bolt round pattern on the front, the input gear needs to be swapped to the short 32 spline version (direct swap) and the factory adapter needs to be notched, then it bolts up.
If you have any of the manual transmissions, you'd need to find an '85-91 GM round pattern 205, swap it to the short 32 spline input gear (direct swap) and notch the tail housing of the trans, then it bolts up.
The 88-98 Chevy 4WD 1500, 2500 and 3500 frames and the 2WD 1500 frames are all very similar and our solid axle conversion works on those trucks without issue.
The 88-98 2WD 2500 and 3500 trucks are different. Their frames drop down lower then curve up at the front and do not have a flat part to attach the spring hangers to. It is possible to put a solid axle under these trucks but the frame will have to be modified to mimic a 4WD truck or you'll have to graft 4WD front frame rails on to the 2WD frame.
Pictured below is a 2WD 2500/3500
Pictured here is a 4WD frame,
note how the frame is straight at the front:
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