transmission swap question
 

just a quick question...what transmission do you protege lx users like to swap into your cars that are stronger IE ford escort or something from a mx-6?

The strongest tranny is the G-series which is already in the lx proteges .. So im told no need to swap .But if theres a stronger one please share some info ...Jon 93lx

thanks thats the answer i was looking for.

i also heard that the g-series can handle up to 300hp? i plan to shotpeen mine (found a place that does it cheap) and my cryotreat the internals as well if its necessary.

Like to see that happen.

As far as i know the gears are strong.. Its the case thats weak and flexes . We need to find a way to brace it .. It can handle 300 hp if u know how to drive . we will find out when i swap in my GTR motor this spring :-) ...Jon 93 lx

not very good with transmissions but do you think welding the case shut would strengthen it?

O.k. so the internals are fine, but the case is the real limitation, What is shotpeening?? How is it performed??

Im not sure how to brace it. i only get info from the people that have had this problem before me... im gonna go to some performance shops and see what they can do for mine ... the internals are strong so im told . And the case flexes which screws up the inside and it blows up or something like that ... Jon

basically, shotpeening is taking the internals of the transmission and shooting them with some type of metal bead...almost like glassbeading or sandblasting. im not sure how it makes the internals stronger, but i know its been done rarely by hardcore enthusiasts and hot rodders.

O.k., but I was asking about the case since that seems to be the weak point in the trans. People have mentioned that they wanted to get the case shot peened.

shotpeening the case? technically wuldn't that make it weaker? i know that cryotreating it would be more logical.

NOTE: cryotreating would basically be freezing the object in a chemical or something and then slowly defrosting it. not sure if its the frozen state or the chemical/ice itself that strengthens it. this shouldn't be too expensive either. its taking apart the transmission itself which is the long part.

Would u be able to do cryotreating on a aluminum transmission? ..Jon

Shot-peening and cryo-treating both aim to change the molecular structure of the metal. Shot-peening increases the surface hardness of the material, through compression (which realigns the crystal structure to make it more uniform). Cryo-treating makes the crystals smaller and more uniform, which will make the surface harder and the whole structure more resistant to cracking. It won't make it stiffer, though.

The problem with the tranny case flexing is that the separation distances between the gears changes and less of the gears are in contact, more load is placed on the edges of the gears, and they tend to break teeth. The only way to make the case stiffer other than adding material, and without FEA (finite element analysis), you wouldn't know exactly where to put the extra material, so you'd wind up just throwing metal at it in hopes of hitting the right places.

What about cryo-treating the gear that takes the stress when its flexing? or a few gears that take the stress so the teeth dont brake :-)..Jon