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post #1 of (permalink) Old 02-08-2001, 10:06 PM Thread Starter
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91 blazer

My friend just got a 91 blazer w/ 4.3. 4x4, auto, ect.
Is there anything that is known for breaking on this truck? What axles and transfer case does he have? I guess the tranny is a 700r4. Were going to put a flowmaster on it tomorrow, I'll let you know how it turns out. Thanks

John


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post #2 of (permalink) Old 02-11-2001, 08:52 PM Thread Starter
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Re: 91 blazer

Over the weekend we took off cat and muffler, put on 2 chamber flowmaster, K N air filter, new O2 sensor. It still doesnt have the power it should, any suggestions why it is lacking power, it has stock size tires so it isnt b/c of bigger meats. Next weekend will dii a full tun up Plugs wires cap rotor, and a JET chip.

John


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post #3 of (permalink) Old 02-11-2001, 09:37 PM
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Re: 91 blazer

It will likely benefit from a tune-up. Look inside the glovebox for the RPO codes. If it has "GU4", it has 3.08:1 gears, "GU6" is 3.42:1, GU8=posi-traction.
www.s10-4x4.com has a decoder for the rest. The axles are a 7.2" ring gear IFS up front, and a 7 5/8" 10 bolt rear with 28 spline axles. The transfer case is an NP231C and has a 2.72:1 low-range. Sometimes the fan clutch being locked up all the time will rob MAJOR power! With the mods you're gonna make to it, it should really scream, though. Good luck.
A.Gdog

1989 S-10 4x4 4.3L/700R-4, 3.08s, 31" Sport Kings
1989 Blazer 4x4 4.3L/700R-4 3.42s,235 Sport Tracks
1985 S-10 4x4 Soon to have 3504BM/TH350/D44/14FF, 35" Boggers
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