I have been frustrated with the 1-2 grind and the fix that was not very effective. I am not really in a hurry to have the dealer tear the box down again.

Since I only have the problem when the transmission is hot, I was thinking I might solve the problem by just keeping it cooler. How about a gearbox cooler?

I am not familiar with the procedure to add a cooler, and I know it is more common on automatic transmissions, but I have seen them on some performance cars (and big trucks).

Any comment on how well this might work? Ideas on where to look or who to talk to about it?

 

you would have to add an external oil pump, Manual transmissions dont have oil pressure. Earl's I think makes a pump designed for manual gear boxes such as circle track and dirt track cars.the problem is they are usually beltdriven off of the crank.
Maybe a modified belly pan that bolts to the bottom of the trans and has tons of cooling fins would work.

 

Might even be easier than on this Porsche:

Transmission Cooler. Kits feature a Tilton electric differential pump flowing lubricant through a Mocal transmission cooler. Transmission temperature drops by more than 30 deg. Earles stainless steel braided -10 hoses and anodized aluminum fittings are used for durability. Coolers can be custom configured for any application. Complete pump and cooler kits start at $595.

 

Chris, why would you buy additional parts and do fabrication when the original 1-2 problem can be fixed under warranty. Maybe try another dealer members have had success with in the area.

 

I would polt your transmission oil temps before spending that kind of money. Sometimes a fix is just another problem!

 

The dealer I used did an excellent job of installing the supplied parts. It did not fix the problem for me and I am not the only one that has found that bandaid repair is inadequate in some boxes.

Just looking at alternatives.

 

This is a great idea if you track the car a lot. I would also do it for the differential. You can use the bolts for filling and draining on both.

Any negative effects if the pump stops working? That and were to mount the coolers would be my two concerns.

 

i think that looks awesome.

 

On the cheap side, at least comparatively, a good quality synthetic gear oil (I use AMSOil) can help reduce the symptoms.
If this is only a problem on the track, double-clutching on downshifts eliminates the notchiness/grinding, in my experience.

 

Fresh gear oil only seems to help with the 1-2 grind if replacing poor lube, not the case most of the time.. it happens when very hot and any lube thins at high temps.

There is no problem on the track; none that I drive on has 1-2 shifts except coming off the grid. I have seldom experienced a grind on a downshift.

The problem is reportedly a tolerance problem, acerbated by heat expansion.. no amount of slipperiness is going to stop the sleeve from pushing the gears together prematurely.