Author Topic: Tranny Pics with questions (Read 3076 times)

mwiley · « **on:** October 07, 2016, 06:44:04 PM »

Ok, so I am about to start putting together a list of everything I need to start my big bore engine build. First I am going to send out the tranny for cryo treatment. So here are a couple of pics from my tranny gears that I need some opinions on.
#1 some of the gears have some noticeable scarring/scratches on the mating surfaces and I need to know if these can be polished out or just leave them?
#2 some of the engagement paw windows and tabs on the gears have noticeably worn the corners and I need to know if it is possible to clean these areas up or do I risk breaking through the surface hardness area?
#3 are there any parts in the tranny that I should not send out for treatment?
#4 I have access to microscopes and even an electron microscope as well as some other image enhancement scanners that will allow me get some more detailed views of everything. So is there any known areas of concern that I should really pay attention too as well?
I know Arlen is making some of the gears for us but I don't want to stop using a part just because it is no longer perfect if it can still be trusted.
Thanks for any help.

thesmith87250r · « **Reply #1 on:** October 07, 2016, 09:22:44 PM »

Lol i was afraid to open this thread !

2ndmoto · « **Reply #2 on:** October 08, 2016, 05:27:32 AM »

Worth upgrading. I am not an expert on saying if those can be fixed or not. Definitely need some attention. There are some aftermarket transmission options out there. LED was working on a transfer set, and there is anot her guy building some.

Best regards
-Jason

Pumashine · « **Reply #3 on:** October 08, 2016, 09:51:10 AM »

Quote from: mwiley;70030

Ok, so I am about to start putting together a list of everything I need to start my big bore engine build.
#2 some of the engagement paw windows and tabs on the gears have noticeably worn the corners and I need to know if it is possible to clean these areas up or do I risk breaking through the surface hardness area?

You might want to look for a low hour atc motor tranny. For $200-$300 it is safe insurance. Those windows should not have damage to them. Not saying they won't work, just saying I would look for a better set of gears. Look into getting 1st or second back cut. This helps keep your motor in gear when launching in 1st or 2nd.