which Ring & Pinion set for tall tires

Pablo · Post by **Pablo** » Sun Jun 30, 2002 12:15 pm

You are a perfect candidate for a Type II transmission, with much lower (and stronger) R&Ps. The Type I is not the best trans for off-road use. While the 3.88G and 4.12 0 are both pretty strong, they are tall R&Ps, not suited for off-road. Going to the 4.86 Type I aftermarket R&P is asking for trouble.

JMHO

Paul

bajaua · Post by **bajaua** » Sun Jun 30, 2002 11:25 pm

Hi,

I have tried my stock 1600dp bug with 30 inch high tires on the rear, but that just changed the gear ratio.

So, will a deferent Ring and pinion set will make back good? Which one?

And where can I buy it online?

Is it hard to do the conversion?

Thanks a lot

bajaua · Post by **bajaua** » Mon Jul 01, 2002 2:18 am

HI

what is the best R&Ps ratio to use in my situation ?

what is bad in the 4.86:1 aftermarket R&Ps

TIMBERWOLF · Post by **TIMBERWOLF** » Mon Jul 01, 2002 3:50 am

I went from a 1303s box in my buggy with 29" tyres to a 'three rib' (reinforcement ribs on diff housing) bus box. home made solid mounts and a bit of clearancing on the frame horns, bug axle, bus cv 's no retainerclips and 924 porsche stub axles. Weekends work and about £200 parts. It'll climb trees now.

Pablo · Post by **Pablo** » Mon Jul 01, 2002 7:38 am

<BLOCKQUOTE>quote:<HR>Originally posted by bajaua:
HI

what is the best R&Ps ratio to use in my situation ?

what is bad in the 4.86:1 aftermarket R&Ps<HR></BLOCKQUOTE>

See above. There is no "best", because the Type I R&Ps that might survive a 30" tire are TALLER in ratio (the opposite direction from where you want to go).

The 4.86 pinion head is too small, and the aftermarket quality is poor. A 4.86 won't last very long at all.

If you insist on remaining with the Type I, Then I would strongly suggest that you use the 4.12 "0" from a Thing transmission, along with a 4.25 1st gear/mainshaft (and other gearing) from ERCO.

Good luck

Paul

Baja Wes · Post by **Baja Wes** » Mon Jul 01, 2002 7:08 pm

The lower the diff ratio, the weaker it will be.

A bus 4.86 is heaps stronger than a bug 4.86 because in the bus tranny they went to a hypoid style ring and pinion which is heaps stronger but a little less efficient.

Pablo · Post by **Pablo** » Fri Jul 05, 2002 10:35 am

<BLOCKQUOTE>quote:<HR>Originally posted by Baja Wes:
The lower the diff ratio, the weaker it will be.

A bus 4.86 is heaps stronger than a bug 4.86 because in the bus tranny they went to a hypoid style ring and pinion which is heaps stronger but a little less efficient. <HR></BLOCKQUOTE>

-- plus the ring gear is 1" bigger, and the set is genuine factory (not aftermarket stuff).

Class 11 streeter · Post by **Class 11 streeter** » Fri Jul 05, 2002 5:31 pm

Hmm, I am running a Thing transaxle now (case code AT) and I had the 4.86 put in. Anytime this comes up, I worry somewhat.
I was led to believe the first to go would be the spider gears (stock differential carrier, not Superdiff

)and possibly a CV, although I have not really beat on the bug repeatedly enough to break something yet.

[This message has been edited by Class 11 streeter (edited 07-05-2002).]

Hot Wheels · Post by **Hot Wheels** » Mon Jul 08, 2002 3:34 am

The bus units are my favorite for off road and big tires. Cheap, strong and low gears. First gear is usually the first to break, bus or car for me. May have somthing to do with the 7500rpm launches and paddles and slicks. The last 4.86 with FTC gears has been bulletproff. The stock first gear was to low so we raised 1st and second to compensate. Great setup.

Sean

www.madbuggies.com · Post by **www.madbuggies.com** » Mon Jul 29, 2002 7:16 pm

I am running a T1 early IRS box with 4.12 gears. My engine is a mild 1641 with 110 cam and a single Weber 2bbl carb. I have 10.50 x 31" Goodyear MT tires on steel wheels and can easily spin them on pavement with only 10lbs of air in them. My buggy weighs around 1200 lbs. I have been told by my parts shop (they build and drive woodsbuggies) that my set-up is good for the 80 Hp I am running. Anything more would need a 5 rib bus tranny. But rem the 4.86 would kill your gas mileage with only 30" tires. Not to mention your top speed would be about 60 MPH. Hope this helps!

------------------
Mike Jacobson
President, Mid-Atlantic Dune Buggy Club

Bob Ingman · Post by **Bob Ingman** » Wed Jul 31, 2002 4:13 pm

The trans in my Thing is bad and I`m ready to swap it out for one from a standard bug. I would like to keep the 412:1 R&P. Is this a DIY swap from unit to unit? Thanks and good luck. Bob Ingman

Post by **Marc** » Wed Jul 31, 2002 4:49 pm

<BLOCKQUOTE>quote:<HR>Originally posted by Bob Ingman:
The trans in my Thing is bad and I`m ready to swap it out for one from a standard bug. I would like to keep the 412:1 R&P. Is this a DIY swap from unit to unit? Thanks and good luck. Bob Ingman<HR></BLOCKQUOTE>

Same trans, different final drive flanges. Overall, I think I'd search out a `72 unit for the beefier clutch mechanism, even though it'll have the fine-tooth gears.

Pablo · Post by **Pablo** » Thu Aug 01, 2002 5:35 am

The Thing 4.12 is a very stout R&P -- much stronger than the Bug version. So yes, it's worth the trouble to swap it over.

Paul

Bob Ingman · Post by **Bob Ingman** » Thu Aug 01, 2002 8:58 am

Thanks Paul. This is consistent with the information I`ve acquired previously.
Can you tell me if the R&P swap is a do it yourself project with no jig or special tools? Feel free to email me if you wish to elaborate . Then I can save the dialog inbox for future use. [email protected]
not thingman2000 any longer
Again, Thanks

Pablo · Post by **Pablo** » Fri Aug 02, 2002 8:53 am

Hi Bob

Unfortunately, this is one area that normally requires special tools (VW mandrel 281 for IRS, and 282 for swingaxle). The more experience the better. But if you want to "wing" it, using bluing to check your R&P mesh pattern, I can pass along a few DIY tips.

But first: 1) Make sure this is a 8:33"0" R&P set. Not all Things had this R&P.
2) Are you transfering from an IRS to a swingaxle trans? 3) Are you transfering from/to a late pinion bearing case?

Paul