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Thu Apr 02, 2020 10:10 pm

I'm wanting to swap out my CV joints on my Trail Rail for something more durable but I need some schooling on it before I spend my money. My Rail is mainly for exploring old mining trails and street use. It has a slightly built up Type 1 trany, standard Type 1 CV joints and is powered by a Ford V6 with a little less than 200 HP. I don't jump it but I do like to go fast on trails.

I understand that the 930's have more travel ability but I haven't added a lot of extra travel. (Boxed but stock trailing arms) The cost is pretty close to the same right now. Type 2 or 930's? What say you?

Fri Apr 03, 2020 6:11 am

Neither. :D Get some Porsche 924/944 joints and 33 spline axles and call it done. CV flanges on the trans for you would be "thing" flanges, same as Type 2 100mm. Then you'd need the 100mm flange stubs of course. Great middle ground, and they travel more than the Type 2 joints by a few degrees. It's what I run and I do jump, and drive on the street and back roads too.

I run about 10-10.25" of clean travel in the rear plus 1 inch of "smoosh" into my little urethane bump stops. The smoosh marks on my trailing arms and me not being able to walk straight after a day in the car suggest everything's working as intended. :twisted:

Fri Apr 03, 2020 8:41 am

One of the problems with going to a 930 CV joint is the weight. The stock type I side gear and differential housing are not really up to the extra weight.
The area where the splines are on the side gears develop cracks and can break off. I broke one myself with just a 40hp engine and stock type 1 CV joints during and off road race.
The extra weight of the 930 CV wears the differential housing causing the the side gear to differential fit to become sloppy.
If you want to go with a 930 CV I would recommend finding a 091 type 2 Bus transaxle to put in your buggy. They have the strongest differential parts and hold up well to the use of a 930 CV.
Another option is a kit that Dave Folts makes and sells, can buy from Weddle too, is a differential kit for the type 1 trans that uses the 091 parts. It makes it a lot stronger.

Fri Apr 03, 2020 9:21 am

I agree with both Jimmy and JS as they stated my thoughts perfectly. I don't respond sometimes just because I know either them or Dusty will respond and they are much more articulate than I am Lol.

Fri Apr 03, 2020 2:38 pm

oldschool5er wrote: I agree with both Jimmy and JS as they stated my thoughts perfectly. I don't respond sometimes just because I know either them or Dusty will respond and they are much more articulate than I am Lol.

:D

I DO agree though.
8)

Fri Apr 03, 2020 4:39 pm

i dont think you can find true 944 cv's anymore though, arent they all the narrower type 2's now?

Fri Apr 03, 2020 5:36 pm

Oh as far as new ones, I'm not totally sure. I just have actual 944 LOBRO joints. eBay, and there was a guy on here that just happened to have a bunch of 944 axle assemblies. Certain years, I think earlist years, it was everything you needed for a bus box in a big rear end! The axles were the right length, the CVs were the right diameter and the stub axles were the same! So I have an "all oem Porsche" rear end I guess.

Wulfthang is gonna need axles that are a little longer for the skinnier bug trans though. Then he's gonna immediately grenade that transmission and go to a bus box, so save those Porsche axles! :P

Fri Apr 03, 2020 7:03 pm

Yeah Type 4 and 944 CV's are not made anymore. I have seen a few NOS pop up overseas now and again for sale though. I buy used 944 and Thing when I can see cleaned up ones so I can see the condition.
I have one Baja with a T-1 transmission in it that has had them on there for decades with good luck. It has a big engine in it. But the Trans is a fully built S case single side cover with a Crown super diff with late side gears. It also has Sway A Way axles so that helps take up some of the torsional loads. I firmly believe in SAW axles as being responsible for some of it's survival. I do know how to drive it though and that probably helps. A T-1 is not forgiving even if it is built up and you can demolish one pretty quick.

Fri Apr 03, 2020 9:20 pm

After reading all of the info here and other places, I've decided to run with the Type 2's. They'll be enough for my purposes until I can afford to upgrade my trany.