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pros/cons of swapping 3 rib for 5 or 6 rib??
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Author:  snail rail [ Tue Feb 05, 2013 11:27 pm ]
Post subject:  pros/cons of swapping 3 rib for 5 or 6 rib??
Now that i've finally got a decent running motor in my buggy and started getting a little more serious with it i've been thinking of going with a 5 or 6 rib. I've got some buddies that have similiar setup as mine and swapped out their 3 ribs for 5 ribs. Whats pros/cons to stepping up to a 5 or 6 besides being a stronger trans? As it is now my 3 rib (running 31x15.50 tires) is very low gear in 1st and seems a little too high geared in 2nd to do any climbing. I do not know specs of the 3 rib I'm running. I'm thinking it's an 002 but how do i identify which 3 rib I've got? Thanks guys
Author:  reno2165 [ Wed Feb 06, 2013 12:46 am ]
Post subject:  Re: pros/cons of swapping 3 rib for 5 or 6 rib??
3 and 5 rib are 002.. 1st thru 4th gears are all the same, jus the RnP is different. 6 rib is 091.. the difference is an 091 has wider gears (hence the longer case)

all the parts in a 3 and 5 rib are interchangable

5 rib (4.86 RnP) is a good trans IMO.. will give you that little bit of speed needed to in first gear to climb
6 rib (4.56 RnP) is the way to go if you plan on building serious power later on down the road

you can pull and 3 rib and drop a 5 rib rite in, but a 6 rib requires a lil modification due to the fact that its about 3/4 in. or so longer than a 002 (3 or 5 rib)

they actually made an 091 3 rib with a 5.42 RnP, believe it came in a diesel.. all the ones i have seen where side shift

i ran a 5 rib for several years against a mild stroker motor and 36" cut buckshots.. the only mod i did to it was install an aftermarket 4 spider gear diff and reverse and it gave me zero issues

* had a buddy with a strong 1835 and 31" v-treads, ran a 3 rib and it was too slow, jus blow the tires out... he came up with a 6 rib and it wouldnt get out of its own way :|.. point being, it takes POWER to run a 6 rib, especially from a dead stop on a hill. he coulda put a 5 rib in it and been good to go

BUT.. depending on budget, you can gear a 6 rib any way you like :mrgreen:
Author:  Red Barron [ Wed Feb 06, 2013 1:28 am ]
Post subject:  Re: pros/cons of swapping 3 rib for 5 or 6 rib??
A 5 rib actually uses a difrent reverse gear than a 3 rib other than that they are the same. A 5 rib is the best for any AC engine under 2 liters in displacement due to the ring and pinion.
Author:  snail rail [ Wed Feb 06, 2013 7:34 pm ]
Post subject:  Re: pros/cons of swapping 3 rib for 5 or 6 rib??
what ring and pinion would my 3 rib have?
Author:  reno2165 [ Wed Feb 06, 2013 7:43 pm ]
Post subject:  Re: pros/cons of swapping 3 rib for 5 or 6 rib??
more than likely 5.38.. although some have 5.42 but those are few and far between
Author:  snail rail [ Wed Feb 06, 2013 7:48 pm ]
Post subject:  Re: pros/cons of swapping 3 rib for 5 or 6 rib??
yeah I just got thru reading some info on 3, 5 & 6 ribs and was getting ready to post nevermind on the R&P question. So it looks like I'm on the hunt for a 5 rib now...If anyone has one gimme a shout
Author:  jesse [ Wed Feb 06, 2013 11:43 pm ]
Post subject:  Re: pros/cons of swapping 3 rib for 5 or 6 rib??
i dont know what size your motor is but if its not a big stroker i would go with the 5 rib you will be pleased
Author:  snail rail [ Thu Feb 07, 2013 5:11 pm ]
Post subject:  Re: pros/cons of swapping 3 rib for 5 or 6 rib??
I don't know exactly what size motor I've got to tell the truth. I bought a buggy last year and this motor was on it. It's kinda aggravating not knowing what you've got, especially when trying to buy stuff like a carb or trans. My last motor was just a stock 1600 DP with a weber progressive and the one I'm running is a lot stronger. Don't see good enough reason yet to have to pull heads and see what size pistons are in it. I'm planning on putting together a 1915 in a few months anyway so I'll benefit from a 5 rib until then. May have a deal worked out on a 5 rib already,
Author:  snail rail [ Thu Feb 07, 2013 5:15 pm ]
Post subject:  Re: pros/cons of swapping 3 rib for 5 or 6 rib??
if I end up with the 5 rib I talked to a guy about earlier I'll have a 3 rib for sale most likely... Or could keep it as a backup in case I scatter the 5 rib
Author:  Roy [ Wed Feb 13, 2013 11:06 pm ]
Post subject:  Re: pros/cons of swapping 3 rib for 5 or 6 rib??
I run a 1915 with dual webers on my buggy and I have a 5 rib in it. It's the perfect ratio for my 31" Firestones verses the power output. The 4.86 ring and pinion is perfect for this combo.
Author:  ericg859 [ Wed Feb 13, 2013 11:22 pm ]
Post subject:  Re: pros/cons of swapping 3 rib for 5 or 6 rib??
have block, crank n heads for sale if ur gonna build 1915
Author:  snail rail [ Fri Feb 15, 2013 5:45 pm ]
Post subject:  Re: pros/cons of swapping 3 rib for 5 or 6 rib??
what size webers do you run Roy? I would be interested in the block crank & heads but shipping all that would be ridiculous
Author:  Huey [ Fri Feb 15, 2013 9:54 pm ]
Post subject:  Re: pros/cons of swapping 3 rib for 5 or 6 rib??
So does 1st gear in a 6 rib fall in between 1st and 2nd on a 3 rib ? Just curious because I've been running a 3 rib for years and climb everything in 2nd gear. However, it's nice having the lower 1st gear in the 3 rib to Idle around in rough areas. I've always been nice to the 3 rib by not hammering the buggy until I get to 2nd gear and also try not letting it bounce when under power.


Huey
Author:  Roy [ Sat Feb 16, 2013 10:19 am ]
Post subject:  Re: pros/cons of swapping 3 rib for 5 or 6 rib??
snail rail wrote:
what size webers do you run Roy? I would be interested in the block crank & heads but shipping all that would be ridiculous


I run 44 Webers but I have them choked down with smaller venturi's. This works very well and it leaves me room to grow later if I build another stroker. I am having so much fun with the 1915 that I will probablly just stay with this combination and save my money.
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