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post #1 of (permalink) Old 03-08-2009, 03:16 PM Thread Starter
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Post Specs needed on 4x4 project.

I'm gonna make this project description as short as possible.

1976 Jeep CJ7
unknown year GMC Suburban 3/4 Ton chassis

Jeep engine, transmission, axles, driveshafts, and leaf springs were removed and replaced with GMC 3/4T 350-V8, 3spd auto(square pan), 10-bolt front and 14-bolt full float rear axles, custom cut driveshafts, and custom leafs.

Now for the questions:

1) transmission is a TH350 correct?
2) what stock gear ratios were included in the GMC 3/4T suburbans with the 350v8-3spd automatic models that had the 14-bolt FF and 10-bolt front axles? I think it's a 75-85 model chassis.
3) were any of the stock differential gear sets posi-trac/locking or just free spin?
4) with 900-16 tires, what gear ratio would be a good moderate on-road/off-road ratio....(will be using it to drive to work and for trail riding/light mudding)....somewhere between 3.5 and 4.10 would be nice.
5) Which of those chosen gear ratios would be available as lockers/posi for an affordable price? (front and rear gears both for under $500 = affordable in my book)

Thanks ahead of time for any info. Opinions, pros/cons, welcome.

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post #2 of (permalink) Old 03-10-2009, 09:53 PM
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1) if one of the corners has a bevele
2) i beleve axels are 3.73, 90% sure that they are
3) it should be limited slip, when you are stuck the tire with no grip spins( unless you kick the rpm's up
4) 4.10 , nice on power/ bad on gas
5) there probably is, you pay for what you get. i've found that those are worth the money.
what transfercase, 205, 208?
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post #3 of (permalink) Old 03-20-2009, 07:29 AM
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i think theyre probly 4.10

rear axle should have stamp on it somewhere. you might need to get to scrubn with the wire brush to find it.

also if you cant find you cand pull the cover and divide the two numbers that are stamped on the ring gear and come up with the gear ration.

89 ifs-sfa truck tranplanted in a 83 K-5 blazer offroad only rig
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