Needs some help on a swing axle ring and pinion ratio

McGary

Hello. I'm new to this forum and would just like to say y'all have a wealth of solid info and helpful advice. Got a question about a buggy I'm working on for my neighbor. I have a buggy that has a transaxle in it which is geared very high for this application. The case number is 113 301 103 Above the number it has a 44 and below it there is a B. The i.d. number on the flat surface is 9443358. Can anyone tell me what tranny I have and what ring and pinion I am working with? The machine is currently impracticle in the woods. What ratios can be swapped into this case and can you recommend any supliers? Also, he brought in a bus tranny 002 301 103B, but it is an irs and it is set up for a swing axle. I could not locate any other numbers on the otherside of the case. He also has a irs tranny in a spray coupe that is 091 301 103. Can the ring and pinion from the irs case be swapped into the swing axle cases? Any help is appreciated.

SamT · Posted: Thu Aug 27, 2015 1:59 pm Post subject:

i dont see the "B" code in my literature, are you missing another letter?

We need to know a few things to suggest a ratio: rear tire size, engine HP guess, type of riding. Do you ever need to go 70mph? What speed would be optimum for your trails? That kind of details.

I have always liked a 4.86 ring and pinion for trail riding in a buggy with taller tires, but a 5.14 may do you if your dont ever get on the road or have huge tires. In my opinion you probably need to plug into the gear ratio calculator and see what to change to get your final drive somewhere around 70mph at 4500 RPM give or take depending where all you ride and at what speed.

The spra coup trans should be standard 091 (dont tell people about that source) trans should have a 4.56 ring and pinion its low enough stock for trail riding if you have tires in the 30-31" range. Its the strongest of the bunch.

The 002 trans has an excellent ratio for trail riding 5.38. They work great with 33-35 tires or smaller if you want it to crawl. Quite a bit tougher than a bug trans.
I would bet money that you could swap the 091 and 002 to a trans builder in exchange for them freshening up and atleast swapping the ring and pinion in your swing axle, maybe even swapping in a superbeetle mainshaft and some used close ratio 3rd and 4th. They are pretty desirable and getting harder to find.
Here is a good forum of info.
http://www.thesamba.com/vw/forum/viewtopic.php?t=143138

McGary · Posted: Thu Aug 27, 2015 3:21 pm Post subject:

By bad the letter in the case code is a D and not a B. The tires are 30.5" tall roughly Remington Wide Brute 11-15LT. And I don't have all the parts to convert it to an IRS. I can install the ring and pinion myself I believe I've rebuilt T5 mustang 5 speeds and installed ring and pinion gears in 8.8 Fords. With a decent set of instructions I feel I could get it done correctly. Any links? The buggy as is doesnt accelerate well at all. You must ride the clutch heavily to even take off. And I ripped it down the highway at 55ish and never made it to 4th gear. He said he wanted it to creep and if it still did close to 55mph great, but not necessary. Any other advice or any sources for a good used set of gears for the swingaxle tranny would be appreciated. Also would you know anyone would would like to buy the spray coup tranny? Thanks SamT.

SamT · Posted: Thu Aug 27, 2015 3:55 pm Post subject:

Yea the calculator shows you could run 125MPH at 5,000 rpm in 4th. Assuming you had lots of power!

Plug in a 4.86 and your down to. 105MPH at 5,000 in 4th

Thats a big help, but you probably need a close 3 and 4. You the 5.XX ring and pinions are tough to get these days, but a trans builder may have one.

There is about anything you want in 3 and 4 gears to get it on down to a usable MPH

McGary · Posted: Thu Aug 27, 2015 7:09 pm Post subject:

What gear ration is in the case at the moment? And will the ring and pinion from the 091 or the 002 transaxles swap into the swingaxle case? I'm new to VW part interchangeability. As I am working on this for my neighbor. I've got the Ford parts interchangeability down though. Wink

Thanks again SamT. Also know anyone who would want the 091? And what are they worth?

SamT · Posted: Thu Aug 27, 2015 8:09 pm Post subject:

The gears and ring and pinion will not interchange.
If the 091 is in good shape (you know it works, doesnt pop out of gear, ect (should be in good shape coming from spra coupe) its worth around $500, maybe 600.
The 002 is worth 250-300 if its in good usable condition.

They are worth that as core engines in exchange for a rebuilt one as long as the ring and pinion is good also, but i doubt a shop would buy a broken one outright for that much.

A stock swing axle trans for the most part is geared:
3.80, 2.06, 1.26, .89 and has a 4.125 ring and pinion. In general if you swap the R&P out you only need to regear 3 and 4 to get it in good shape offroad.
There is some floating around with a 4.37 ring and pinion (yes its very noticable difference) they are a 6volt case that can be modified for 12volt.

Keep in mind that everything Vw can and has been modified. People just dont leave them alone so its tough to assume any motor is stock. Transmissons are usually stock, but you never know.

McGary · Posted: Thu Aug 27, 2015 9:34 pm Post subject:

What do you mean by floating around? Would I have to swap to a different 3rd and 4th gear if I change the ring and pinion? Also who are good suppliers of vw ring and pinions?

SamT · Posted: Fri Aug 28, 2015 5:35 am Post subject:

gears · Posted: Fri Aug 28, 2015 10:05 am Post subject:

If you run big tires, you really need to bite the bullet and change over to IRS. The strength of the low ratio Type II R&Ps is FAR greater than Type I low R&Ps.
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SamT · Posted: Fri Aug 28, 2015 1:28 pm Post subject:

McGary · Posted: Sat Aug 29, 2015 9:24 am Post subject:

Could you recommend any links for installing ring and pinion gears in a swing axle setup? Thanks again

dustymojave · Posted: Tue Sep 01, 2015 7:38 pm Post subject:

If you're looking to do the job yourself, know that it aint for the faint of heart to rebuild it yourself. It involves taking the whole transaxle apart to change the ring & pinion.

There is a video set and some special tools are needed.

If you're looking for someone to do the job for you, you'll have to check with the folks in your area. Don't even THINK of taking it to a trans shop that is ANYTHING BUT a VW trans specialist. Other trans shops don't have the right tools and have no experience in working on VW gearboxes which are quite different from other transmissions. Sometimes they THINK they have it covered...but NAAAAAHHH.
_________________
Richard
Offroading VW based cars since 1965
Tech Inspection 1963 - 2012 SCCA/SCORE/HDRA/MORE/MDR +
Retired from building Bajas, Fiberglass Buggies and Rails in the Mojave Desert. Also Sprints & Midgets, Dry Lakes, Road Race cars. All types New and Vintage
SoCalBajas Member
Kicked Cancer's A$$...1st and 2nd round...Fight ain't over yet.


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