Interesting find: high gears in a 14FF...

[thatK30guy]

Whats the highest (numerically lower) gears you have found, seen or heard of in a 14FF?

Last night while at a buddies shop, we decided to pull off the drums on his 1980 K20, which of course, came with the 10 bolt front and 14FF rear.

I had owned this truck before I sold it and he got it later from the buyer I sold it to. We had all known from the PO that I bought it from that it had HIGH gears in it. So last night we decided for $h!ts and giggles, to pull the covers off and find out exactly what ratio they were. We were in a shock after the covers were removed.

In the 14FF, the stampings on the ring gear showed 14 and 45. Did the math and came up with 3.22 ratio.

In the 10 bolt, the stampings were 13 and 42. That came out to 3.24 ratio.

Now the big question is: has anyone else ever seen or heard of this ratio in a 3/4, or even 1 ton?

We were all standing around like fools, dumbfounded, with our jaws on the floor. We all agreed that we've heard of 3.42's and 3.73's but never heard of 3.22 or 3.24.

Anyone else care to pitch in and elaborate? Would this kind of ratio be a super rare set that may be worth something on eBay? Opinions please....

 

[k204dr]

wanna sell those? i've heard of them but don't see them much. i've got a 3.42 rear in my truck.

 

[thatK30guy]

My buddy says that if he decides to scrap the truck, then he will give me the ok to sell them for him. We are still doing investigations on this odd ratio. He's a full-time mechanic and has never heard of this ratio for the GM 3/4 tons.

 

[nvrenuf]

I've seen a set of 3.22's before in a Burb (can't remember the year), definitely rare stuff.

 

[4xcrazy]

how about a set of 2.29's in a car rear

 

[bowtiepower00]

Yes, I have heard of 3.23's in a 14FF. 3.42's also. I would like to build a Burb or other rig, 2wd with a 4BT, NV4500, and 3.23's. I think you could really get some mileage from a setup like that.

 

[Russell]

I've got a 10 bolt front with 2.56 gears in it, 41 teeth on the ring gear, and 16 on the pinion, yes I counted serveral times, lol

 

[Currank5]

Those ratios are around. Not the most common esp. in a 14 bolt. RPO code GU5= 3.23 ratio. When i got my blazer i found out i had 2.73 gears. Wish i had checked that out when i got it but i was just happy to get a good deal on another blazer.

 

[big83chevy4x4]

a buddy of mine had 3.23s in a 3/4 ton axles, it was a 14bsf though. i always thought that 3.42 was the lowest in a 14bff.

 

[FOR MUD]

I know the the lower the gear the higher the GVWR. Check the specs on the truck and see what it is.

 

[atho]

a buddy of mine had 3.23s in a 3/4 ton axles, it was a 14bsf though. i always thought that 3.42 was the lowest in a 14bff.

I saw a 80's 2wd suburban at the jy with a 3.23 14b ff. (the diff cover was off, gears were rusty)

 

[Hossbaby50]

I remember a few years ago Ddraggoon said he had a 14bff with 3.23's in his Suburban.

Harley

 

[Drey]

im still anixous to tear into the 10 bolt on my K10...3.08s at least but it felt higher geared then another kids truck who had 3.08s, He thought I might have 2.80 somethings

 

[dyeager535]

I have the 10 bolt 3.23 gears out of a 3/4 ton truck that was 14FF in the rear.

Never seen any numerically lower thn that in a 14FF though. 14SF for that matter either.

 

[u2slow]

I run 3.21 in the 14bFF in my Burb. Seems it shows up in bigblock trucks.