Pictures

 

I’m not seeing in 715 where to flip a gear.

 

When I get back to work on Thursday, I will run this by my cube mate, who has a VW-based dune buggy, and years of playing with transmissions to his credit. If Matt doesn't know, I am out.

We both love to figure these things out, too. Not the usual. His other toy, a 1960 T-bird, is getting its new engine over the holidays. In 1960, cars were different for sure. It has an alternator conversion and a disc brake conversion and on and on...

 

Planetary gears in the differential are straight cut. The "flip" would have to be fairly early in the line of things that spin - I just don't know what that would be (maybe the input carrier assembly?). And it would certainly entail having whatever the piece is manufactured. I'm sure much too expensive for a one-off piece, even if I had a number of people interested :-)

 

Here is the final drive if that helps

 

Every gear is helical cut.
I don't know it flipping every gear over, so the helics face the other way, would be an answer.

Basic understanding on planetary gears.

 

Hard to tell if ours are straight cut or helical, but it would make sense that they're helical. Even flipping them over, the cuts still face the same way. A whole new gearset would need to be manufactured.

 

If the gears are cut say, left to right. Flipping would make the right to left.
The gears are helical cut. That's for a nose issue compared to straight cut gears.
Think ring gear flipping in the VW trans axil.
Flipping it over makes thing run in reverse.
If the VW engine was mounted to that setup the car would have 4 reverse gears and one forward.
The biggest thing is the problem with the ring gear, its part of the drum. Which would be very costly to make.

Look at the Ebay pickures.
https://www.ebay.com/itm/4T65E-DIFFE...4383.l4275.c10