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the 14bsf has 3.4 gear ratio? Need advice and opinions

crawlink5

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Got the 3/4 ton burb 4x4 running gear home today. I jacked one rear tire up (open carrier) and spun it. the tire rotated once and the shaft rotated about 1.75 turns. Did this about 5 times to be sure.

Question 1) Now, in my extremely tired state I might be thinking with a brain fart - should I multiply this by 2? To get about a 3.40?

If so, this 14BSF rear has ~3.40 gears and 33" BFG ATs on 16.5" rims. I currently have 3.73/33s with a 700r4.

Question 2) Is anyone running this ratio (3.40/33s/700r4) with no problems? With problems? In Overdrive?

This blazer came factory with TH350/3.73s. I want to keep the 3.73s but I just don't have the cash to change gears now. Opinions Please!!

Question 3) I do have a 14bff with 3.73s that I could use. Will the brakes from the SF fit on the FF? The FF has no brakes at all, or any of the parts.

I have not checked the gear ratio in the front yet, it all looks factory untouched, but, the front driveshaft was not hooked up. May be different, don't know.

Thanks,
Doug
 

berg76

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Q1 - Yes, you probably have 3.42s

Q2 - Dont know.

Q3 - If memory serves me correct, If they are the 13x2.5 brakes then I believe they are identical. I have a 14bsf and a ff and the drums/shoes match. Ive not set them side by side but they sure look the same. Hopefully someone else can verify. /forums/images/graemlins/thumb.gif

~Jason
 

smokkey1

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I have a 14sf and I"m wondering what gears I have too??? I probably should pull the diff cover and check...I'm running 36" swampers with a th400 it feels real strong though. but I wished I had OD for the highway...


justin
 

crawlink5

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If you could use OD with 36" tires you prob have 4.11s or lower. Just a guess from experience. I had 4.56/35s/OD in a wrangler 6 cyl and it seemed just right.

With the th350/3.73s and 33s I needed OD (so I went with the 700r4) but this was a factory setup. With 3.42s the OD may go out in the 700r4, that's why I'm asking opinions on the proposed setup.

On the brakes, the drums look as big as the ff. Fills up the 16.5 rims completely and sticks way out the back
 

smokkey1

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[ QUOTE ]
If you could use OD with 36" tires you prob have 4.11s or lower. Just a guess from experience. I had 4.56/35s/OD in a wrangler 6 cyl and it seemed just right.

With the th350/3.73s and 33s I needed OD (so I went with the 700r4) but this was a factory setup. With 3.42s the OD may go out in the 700r4, that's why I'm asking opinions on the proposed setup.

On the brakes, the drums look as big as the ff. Fills up the 16.5 rims completely and sticks way out the back

[/ QUOTE ]


I edited my first post...what I ment to say was I wished I had OD for the highway...


justin
 
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