Chevy 3/4 ton running gear in jeep - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 09-06-2003, 02:56 AM
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Chevy 3/4 ton running gear in jeep

I have a 1969 4x4 3/4 ton suburban complete rolling chassis with 4 spd and a rockwell model 221 transfer case, The front axle is a closed nuckle with drum brakes and I think the gear ratio is 4.56:1 the rear end has a drop out third member and a removable rear cover it also has some form of a posi I have not removed the cover to check it out yet. Anyone with info on this running gear?. I also have a 1976 3/4 ton chevy 14 bolt rear end this came out of a truck with a automatic so I suspeect that the gearing is in the 3.08 to 3.50 range. I would like to know if either of these would be suitable for modification to a older jeep. I would like to build a solid off road machine. Any comments would be helpfull. Thanks
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post #2 of (permalink) Old 09-06-2003, 04:05 AM
 
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Re: Chevy 3/4 ton running gear in jeep

14 bolt, yep... the tranny should be an sm465?? I can't remember the year went from 420 to 465, '63???? Anyway, either one is a bombproof tranny. Adaptors are kinda spendy, but IMHO probably worth it. As for the rockwell t-case, I haven't the slightest but someone will fill you in.
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post #3 of (permalink) Old 09-06-2003, 11:45 AM
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Re: Chevy 3/4 ton running gear in jeep

The 14 bolt is a good solid rear end but hangs a little low in the middle. I think they quit using the SM420 around 1967, so you probably have the SM465 which is plenty stout. As for the front axle in the Suburban, is it disk or drum brakes??? I don't know much about the Rockwell T-case but you can get a NP205 with the factory adapter from a salvage yard and have a good set up!!! You will have to outboard your front springs unless you plan on cutting the axles down or converting to coil. Coils are my plans if I ever get caught up on everything,
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post #4 of (permalink) Old 09-06-2003, 04:45 PM
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Re: Chevy 3/4 ton running gear in jeep

14 bolt is a tank and worth saving (and shaving). I'm running an sm465 and love it (68 was the first year for the 465), although when you divide the t-case and tranny, I'm betting there will be a lot of tail shaft wear on the course spline shaft. I went with Novak fine spline tail shaft conversion. It's harder to do, but bullet proof when your done.
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post #5 of (permalink) Old 09-07-2003, 01:45 AM
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Re: Chevy 3/4 ton running gear in jeep

I'd skip on the the closed knuckle front axle.

The rear is probably an Eaton...
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post #6 of (permalink) Old 09-09-2003, 01:21 PM
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Re: Chevy 3/4 ton running gear in jeep

The front should be a dana 44 but it should only have 260 size u-joints.

If I am thinking of the transfer case you have, is the rear output lower than the input too?
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post #7 of (permalink) Old 09-10-2003, 01:50 AM
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Re: Chevy 3/4 ton running gear in jeep

Yes the front axle is a model 44 it is cast into the webing on the housing. What about the u-joint size and the closed knuckle. The transfer case output yokes are like a model 20 the rear is straight out the rear and the front is lower
post #8 of (permalink) Old 09-10-2003, 02:16 AM
 
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Re: Chevy 3/4 ton running gear in jeep

If the rear is an Eaton, you can build a bitch'n hy-bred axle with it and 14bolt parts. The Eaton shafts are only something like 17 spline(?), but 30 spline 14bolt shafts, hubs and spyder gears fit the Eaton housing and carrier. And even the 14bolt Detriot will fit. The stamped steel, Eaton housing only weights 75 lbs and has better ground clearance then the 14bolt.
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post #9 of (permalink) Old 09-10-2003, 02:26 AM
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Re: Chevy 3/4 ton running gear in jeep

That would be jreat if all of the 14 bolt parts will interchange with the eaton it sounds like you have done this before?. Do you know anything about the transfer case, or modifing the suburban frame to fit under the jeep? Thanks.
post #10 of (permalink) Old 09-10-2003, 09:49 AM
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Re: Chevy 3/4 ton running gear in jeep

Does you transfer case look like the one in the picture on page 2?

221 rebuild instructions
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