blown 87

That is good to know, but since I have no intentions of ever putting mine on a track, only the rare "Lets out run the new car from a stop light" a higher gear will help me on the street.

hacker-pschorr

That's all fine and dandy, you skipped the primary reason they went this route and that's longevity of the transmission, not efficiency (which is an added side benefit).
Yes we all know with you behind the wheel nothing ever breaks. Most other 928 owners / drivers are not so lucky.

Not to mention 95% of the time Jim is at Road America with three very long straights, the longest is about 5,000 ft.

Mike Simard

I started with a '79 box and it was about to fall apart so in went an 88 one.
I do miss the early ratios, they are perfect!

mark kibort

thats where you would need the 2.75. with more than 375rwhp that is. after 155, if you dont have a 2.75, you are dead in the water, but if you are not getting this fast, then 2.2 is the way to go. remember andersons video of him banging off the high end rev limiter when he was there in the late 90s or early 2000s? 2.2. now with 500rwhp, he needs another gear with "Bite"!!

went what route with the tranmission? going to a 2.75 or going to the 2.2?
what does it have to do with longevity anyway. just curious. havent heard that before.

yep, nothing breaks. (knock, knock, knock! ) thats why you guys built me that motor, so I wouldnt break it!!

Mike Simard

I only bothered shifting into 5th one time and it was around 7k. I normally see 7700 rpms routinly, mostly from not wanting to shift out of 3rd. I'd rather have the ratios of my old 79 box.
Hacker' makes another good point, 5th gear is 'direct' and more efficient'

Isn't it nice of Greg to start this gearing thread for us?

blown 87

Does not bother me a bit.

fbarnhill

Darn Greg, You got me thinking of doing a conversion on one of my auto's. By any chance are you doing a write up with pic's like Dwane?

Thanks,

blown 87

Nope, sorry, but what do you want pics of and maybe I can take some for you.

There really is no room to get pics of the pedals and firewall part, and swapping the trans out is pretty straight forward.

Lizard928

So Greg, and Mike, why dont the two of you swap transmissions.

blown 87

tis a thought.

I was going to send you a PM, would you happen to have pics of a stock trans tunnel opening for a 5 speed?

I want to do mine as close to stock as I can and I am not real sure what the difference is between the two.

I am talking about the part that the shifter handle goes into the interior of the car.

Lizard928

I dont have a picture, but if you remove the boot assembly off the auto so you can see the chassis it becomes pretty obvious.

On the auto there is an extra amount of material which is added by riviting and gluing into the normally rectangular hole.
I removed 90% of this material on my install.

Black Sea RD

Hi Greg,

This is from my 1986.5 track car auto to 5 speed conversion.

Come to think of it, this was another PITA part of the conversion. Not that difficult, just time consuming and messy.

As you can see I trimmed off the raised lip around the opening. I then used double sided tape to stick the rubber 5 speed cover over the opening.

You might want to leave the raised metal lip alone so the rubber part can be fit over it as the stock 5 speeds do.

HTH,

blown 87

Yep, that was a bitch, I got the added part out in one piece so if I decide to go back with the auto i can, but I would go drinking for a week before it comes to that , that added a bit of added difficulty to it.

Got every thing swapped over to the new cross member and the 5 speed wining harness set up on the trans, so at this point it is pretty much just putting every thing back in the car, I still have to install the starter bridge in place of the relay.

I hope I can get in back in tomorrow, only about 2 more days than I thought it was going to take.

BTW
Collin, my hats off to ya brother to do the while conversion in a day, or 2.5 taking the engine out.

soupcan

Rare? Stop light runs for some reason happen to me all the time.

Mike Simard

Greg, the lip around the shifter opening orients the rubber shifter boot. Any way of orienting and holding down that boot would be a good thing, it might even be better than original to screw in strips along the edges.

In my racer I have nothing but that rubber boot. There are 2 fire extinguisher lines that run on either side of it. I mounted the clamps for the lines close to the boot and the lines act to hold the boot down. it really works nicely and it's a treat to not have that boot come off the lip